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Return to 100 Java Mistakes and How to Avoid Them, Effective Java, 100 Java Mistakes and How to Avoid Them - Table of Contents

index

SYMBOLS

–2,147,483,648 (Integer.MIN_VALUE)[2,147,483,648 (Integer.MIN_VALUE], 2nd, 3rd, 4th, 5th

–0.0 (negative zero)[0.0 (negative zero)], 2nd

& (bitwise and) operator

@OverridingMethodsMustInvokeSuper annotation[OverridingMethodsMustInvokeSuper annotation]

]

@MustBeInvokedByOverriders annotation[MustBeInvokedByOverriders annotation]

2,147,483,647 (Integer.MAX_VALUE) , 2nd, 3rd

@RegEx annotation[RegEx annotation]

@Deprecated annotation[Deprecated annotation]

&= operator

// fallthrough comment

@Nested annotation[Nested annotation]

\<clinit\\> method[clinit method]

32,767 (Short.MAX_VALUE)

@Range annotation[Range annotation]

–128 (Byte.MIN_VALUE)[128 (Byte.MIN_VALUE)], 2nd, 3rd, 4th

@GTENegativeOne annotation[GTENegativeOne annotation]

@NonNullByDefault annotation[NonNullByDefault annotation]

@SuppressWarnings annotation[SuppressWarnings annotation], 2nd

@CheckReturnValue annotation[CheckReturnValue annotation], 2nd

@FormatMethod annotation[FormatMethod annotation]

@Nonnegative annotation[Nonnegative annotation]

@Nullable annotation[Nullable annotation], 2nd, 3rd

%b specifier

% operation

@NonNegative annotation[NonNegative annotation]

@Unmodifiable annotation[Unmodifiable annotation], 2nd

@SideEffectFree annotation[SideEffectFree annotation]

@Contract annotation[Contract annotation]

127 (Byte.MAX_VALUE), 2nd, 3rd, 4th

-ea (enable assertions) command-line option[ea (enable assertions) command-line option]

@Test annotation[Test annotation], 2nd

0 (zero)

failing to return when comparing equal objects, 2nd

4.9 × 10<Superscript>–324<Default Para Font> (Double.MIN_VALUE)[4.9]

@FormatString annotation[FormatString annotation]

@IntRange annotation[IntRange annotation]

\<localInspection\\> entry[localInspection]

+ operator

-c javap tool command line option[c javap tool command line option]

AAA (ARRANGE, ACT, ASSERT) PATTERN

AAA (Arrange, Act, Assert) pattern

ABS() METHOD (MATH CLASS)

abs() method (Math class), 2nd, 3rd

ACT PART

Act part

ADD() METHOD (COLLECTION INTERFACE)

add() method (Collection interface), 2nd, 3rd, 4th, 5th

ADDALL() METHOD (COLLECTION INTERFACE)

addAll() method (Collection interface)

ADDEXACT() METHOD (MATH CLASS)

addExact() method (Math class)

ADDITION

addition, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

AND() METHOD (BITSET CLASS)

and() method (BitSet class)

ANDROID ANNOTATIONS

Android annotations

ANNOTATION, CALLING GETCLASS() ON

annotation, calling getClass() on

ANNOTATIONTYPE() METHOD (ANNOTATION INTERFACE)

annotationType() method (Annotation interface)

ANTISYMMETRY

antisymmetry

ANYMATCH() METHOD (STREAM INTERFACE)

anyMatch() method (Stream interface)

APACHE COMMONS LANG

Apache Commons Lang, 2nd

APPENDCODEPOINT() METHOD (STRINGBUILDER CLASS)

appendCodePoint() method (StringBuilder class)

ARITHMETIC OPERATORS

arithmetic operators

addition, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

division, 2nd, 3rd, 4th, 5th, 6th, 7th

multiplication, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

subtraction, 2nd, 3rd, 4th, 5th, 6th, 7th

unary minus

ARITHMETICEXCEPTION

ArithmeticException, 2nd, 3rd, 4th, 5th

ARRANGE PART

Arrange part

ARRAY

array, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

binary search bug

hash code of, 2nd

index out of bounds, 2nd

using in loops, 2nd

variable arity parameter, 2nd

ARRAYDEQUE CLASS

ArrayDeque class, 2nd, 3rd

ARRAYINDEXOUTOFBOUNDSEXCEPTION

ArrayIndexOutOfBoundsException

ARRAYLIST CLASS

ArrayList class, 2nd

ARRAYS UTILITY CLASS

Arrays utility class

asList() method, 2nd

binarySearch() method

deepEquals() method

deepHashCode() method

equals() method

hashCode() method

setAll() method, 2nd, 3rd

sort() method, 2nd

ASLIST() METHOD (ARRAYS CLASS)

asList() method (Arrays class), 2nd, 3rd

ASSERT PART

Assert part

ASSERT PREFIX

assert prefix

ASSERT STATEMENT

assert statement

ASSERT STATEMENT WITH SIDE EFFECTS INSPECTION

assert Statement with Side Effects inspection

ASSERTEQUALS() METHOD

assertEquals() method, 2nd

ASSERTION IS SUPPRESSED BY CATCH INSPECTION

Assertion Is Suppressed by catch inspection

ASSERTNOTEQUALS() METHOD

assertNotEquals() method

ASSERTNOTNULL() METHOD

assertNotNull() method, 2nd, 3rd

ASSERTTHAT() METHOD

assertThat() method

ASSERTTHROWS() METHOD

assertThrows() method, 2nd, 3rd

ASSIGNMENT TO FOR LOOP PARAMETER INSPECTION

Assignment to for Loop Parameter inspection

ASSIGNMENT TO STATIC FIELD FROM INSTANCE CONTEXT INSPECTION

Assignment to Static Field from Instance Context inspection

ASSUMPTIONS, WORLD IS STABLE

assumptions, world is stable, 2nd

ATOMICINTEGER CLASS

AtomicInteger class

AUTOMATED TESTING

automated testing, 2nd

AVAILABLEPROCESSORS() METHOD (RUNTIME CLASS)

availableProcessors() method (Runtime class)

BIFUNCTION INTERFACE

BiFunction interface

BIGDECIMAL CLASS

BigDecimal class, 2nd

comparing with different scales

stripTrailingZeros() method

BIGINTEGER CLASS

BigInteger class, 2nd, 3rd

BINARY SHIFT

binary shift, 2nd, 3rd, 4th, 5th, 6th

left

right, 2nd

BINARYSEARCH() METHOD (ARRAYS CLASS)

binarySearch() method (Arrays class)

BITSET CLASS

BitSet class, 2nd, 3rd

BITWISE OPERATORS

bitwise operators, 2nd, 3rd, 4th

BOOLEAN CLASS

Boolean class

FALSE constant

TRUE constant

compare() method

getBoolean() method

parseBoolean() method

BOOLEAN TYPE

Boolean type, 2nd

BOOLEAN VALUE

boolean value, 2nd, 3rd

comparison

conversion from string, 2nd

BOXED BOOLEAN

boxed Boolean, 2nd

BOXED NUMBERS

boxed numbers, 2nd, 3rd, 4th, 5th, 6th

cache

BREAK STATEMENT

break statement

BREAKITERATOR CLASS

BreakIterator class

BUFFEREDREADER.READLINE() METHOD

BufferedReader.readLine() method, 2nd

BYTE TYPE

byte type

array of

cast to

negative values, 2nd

widening, 2nd

BYTEARRAYOUTPUTSTREAM CLASS

ByteArrayOutputStream class

BYTE[] ARRAY

byte[] array

CALENDAR CLASS

Calendar class

CALL TO STRING.TOUPPERCASE() OR TOLOWERCASE() WITHOUT A LOCALE INSPECTION

Call to String.toUpperCase() or toLowerCase() Without a Locale inspection

CASE CONVERSIONS

case conversions, 2nd

CAST CONFLICTS WITH INSTANCEOF INSPECTION

Cast Conflicts With Instanceof inspection

CHAR TYPE

char type

compound assignment

passing to StringBuilder constructor

widening, 2nd, 3rd

CHARACTER.ISDIGIT() METHOD

Character.isDigit() method, 2nd

CHARAT() METHOD (STRING CLASS)

charAt() method (String class), 2nd, 3rd

CHARSEQUENCE INTERFACE

CharSequence interface

CHECKER FRAMEWORK ANNOTATIONS

Checker Framework annotations

CHECKINDEX() METHOD (OBJECTS CLASS)

checkIndex() method (Objects class)

CLAMP() METHOD (MATH CLASS)

clamp() method (Math class)

CLASS CLASS

Class class

getClass() method

getClassLoader() method

getMethod() method, 2nd

isInstance() method, 2nd

CLONEABLE INTERFACE

Cloneable interface

CODE QUALITY

code quality

code assertions

code review

code style, 2nd

static analysis

CODEPOINTAT() METHOD (STRING CLASS)

codePointAt() method (String class)

CODEPOINTCOUNT() METHOD (STRING CLASS)

codePointCount() method (String class)

CODEQL

CodeQL

COLLECT() METHOD (STREAM CLASS)

collect() method (Stream class)

COLLECTION INTERFACE

Collection interface

add() method, 2nd, 3rd, 4th, 5th

addAll() method, 2nd

contains() method, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

containsAll() method

forEach() method, 2nd

isEmpty() method, 2nd

parallelStream() method

remove(Object) method

removeAll() method

removeIf() method, 2nd

retainAll() method

stream() method

COLLECTIONS

collections

COLLECTIONS UTILITY CLASS

Collections utility class

checkedList() method

checkedMap() method

max() method

min() method, 2nd

shuffle() method

unmodifiableCollection() method

unmodifiableList() method, 2nd

unmodifiableSet() method

COLLECTORS CLASS

Collectors class

groupingBy() method

maxBy() method

minBy() method

partitioningBy() method

toList() method, 2nd

toMap() method

toSet() method

toUnmodifiableList() method

COM.GOOGLE.ERRORPRONE.BUGPATTERNS.BUGCHECKER ABSTRACT CLASS

com.google.errorprone.bugpatterns.BugChecker abstract class

COM.GOOGLE.ERRORPRONE\

com.google.errorprone\

error_prone_check_api artifact

COMPARABLE INTERFACE

Comparable interface

compareTo() method, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

COMPARATOR INTERFACE

Comparator interface

compare() method

comparing() method

comparingDouble() method

nullsFirst() method, 2nd

nullsLast() method, 2nd

thenComparing() method

COMPARATORS

comparators

returning random numbers from

COMPARE() METHOD

compare() method

of Boolean class

of Comparator interface, 2nd, 3rd

of Double class

COMPARE() METHOD CAN BE USED TO COMPARE NUMBERS INSPECTION

compare() Method Can Be Used to Compare Numbers inspection

COMPARETO() METHOD (COMPARABLE INTERFACE)

compareTo() method (Comparable interface), 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

COMPARINGDOUBLE() METHOD (COMPARATOR INTERFACE)

comparingDouble() method (Comparator interface)

COMPARISON METHODS

comparison methods

malformed implementation, 2nd

COMPARISON TO DOUBLE.NAN OR FLOAT.NAN INSPECTION

Comparison to Double.NaN or Float.NaN inspection

COMPARISONCHAIN CLASS

ComparisonChain class

COMPONENT.HANDLEEVENT() METHOD

Component.handleEvent() method

COMPUTE() METHOD (MAP INTERFACE)

compute() method (Map interface)

COMPUTEIFABSENT() METHOD (MAP INTERFACE)

computeIfAbsent() method (Map interface), 2nd, 3rd, 4th

COMPUTEIFPRESENT() METHOD (MAP INTERFACE)

computeIfPresent() method (Map interface)

CONCATENATION

concatenation, 2nd

CONCURRENTHASHMAP CLASS

ConcurrentHashMap class

CONCURRENTLINKEDDEQUE CLASS

ConcurrentLinkedDeque class

CONCURRENTLINKEDQUEUE CLASS

ConcurrentLinkedQueue class

CONCURRENTMODIFICATIONEXCEPTION

ConcurrentModificationException

CONDITIONS

conditions

dominated by previous condition, 2nd

CONFUSING ARGUMENT TO VARARGS METHOD INSPECTION

Confusing Argument to Varargs Method inspection

CONSTANT VALUES INSPECTION

Constant Values inspection, 2nd, 3rd, 4th

CONTAINS() METHOD (COLLECTION INTERFACE)

contains() method (Collection interface), 2nd, 3rd, 4th, 5th, 6th

CONTAINSKEY() METHOD (MAP INTERFACE)

containsKey() method (Map interface)

COPYOF() METHOD

copyOf() method

COUNT() METHOD (STREAM INTERFACE)

count() method (Stream interface)

COUNTDOWN() METHOD (COUNTDOWNLATCH CLASS)

countDown() method (CountDownLatch class)

COUNTDOWNLATCH CLASS

CountDownLatch class

COVERITY

Coverity

CREATENEWFILE() METHOD (FILE CLASS)

createNewFile() method (File class)

CRYPTOGRAPHIC KEYS

cryptographic keys

DATA STRUCTURES, NON-ATOMIC ACCESS

data structures, non-atomic access

DATE CLASS

Date class, 2nd

DATETIMEFORMATTER CLASS

DateTimeFormatter class

ofPattern() method

DECIMALFORMAT CLASS

DecimalFormat class

DEFAULT LOCALE

default locale

in String.format() method, 2nd

in case conversions, 2nd

DIVISION

division, 2nd, 3rd, 4th, 5th, 6th

DOUBLE CLASS

Double class

MAX_VALUE constant

NEGATIVE_INFINITY constant

NaN constant

compare() method

isNaN() method

parseDouble() method

DOUBLE TYPE

double type, 2nd

boxing in conditional expression

comparing

domain

rounding errors

signed zero

underflow

widening

DYNAMIC ANALYSIS

dynamic analysis

ELEMENT INTERFACE

Element interface

ELSE BRANCH

else branch, 2nd, 3rd

ENUM CLASS

enum class, 2nd, 3rd, 4th

getClass() method

getDeclaringClass() method

initialization order, 2nd

ordinal() method

ENUM SWITCH

enum switch

ENUMSET CLASS

EnumSet class, 2nd

EQUALS() BETWEEN OBJECTS OF INCONVERTIBLE TYPES INSPECTION

equals() Between Objects of Inconvertible Types inspection, 2nd

EQUALS() CALLED ON ITSELF INSPECTION

equals() Called on Itself inspection

EQUALS() CALLED ON JAVA.MATH.BIGDECIMAL INSPECTION

equals() Called on java.math.BigDecimal inspection

EQUALS() CALLED ON STRINGBUILDER INSPECTION

equals() Called on StringBuilder inspection

EQUALS() METHOD

equals() method, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

malformed implementation, 2nd

using on unrelated types, 2nd

EQUIVALENCECHECKER CLASS

EquivalenceChecker class

ERROR PRONE ANALYZER

Error Prone analyzer

ERROR PRONE ANNOTATIONS

Error Prone annotations

ERROR PRONE BUG PATTERNS

Error Prone bug patterns

BareDotMetacharacter

CheckReturnValue

CollectionIncompatibleType

EqualsNaN

FormatString

GetClassOnAnnotation

GetClassOnClass

GetClassOnEnum

IndexOfChar

InfiniteRecursion

MissingSuperCall

StringBuilderInitWithChar

URLEqualsHashCode

EXCEPTIONS

exceptions

ArithmeticException, 2nd, 3rd, 4th

ArrayIndexOutOfBoundsException, 2nd, 3rd

ClassCastException

ConcurrentModificationException, 2nd, 3rd

IndexOutOfBoundsException, 2nd, 3rd, 4th, 5th

StringIndexOutOfBoundsException, 2nd

EXPRESSIONS

expressions

accidental concatenation instead of addition

conditional expression, 2nd

EXTENDING STATIC ANALYSIS TOOLS

extending static analysis tools

Error Prone plugin

SpotBugs plugin

FAIL() METHOD

fail() method

FAIL-FAST BEHAVIOR

fail-fast behavior

FASTUTIL LIBRARY

FastUtil library

FIELD

field

comparing in equals, 2nd

initialization order, 2nd, 3rd

stability

FIELD.SETACCESSIBLE() METHOD

Field.setAccessible() method

FILE CLASS

File class, 2nd

createNewFile() method

delete() method

mkdir() method

rename() method

separator constant

FILES CLASS

Files class

createDirectories() method

getLastModifiedTime() method

isDirectory() method

isRegularFile() method

isSymbolicLink() method

list() method

size() method

FILTER() METHOD (STREAM INTERFACE)

filter() method (Stream interface)

FINAL VARIABLE

final variable, 2nd

FINDBUGS/SPOTBUGS ANNOTATIONS

FindBugs/SpotBugs annotations

FLAKY TESTS

flaky tests

FLOAT TYPE

float type, 2nd, 3rd

FLOORMOD() METHOD (MATH CLASS)

floorMod() method (Math class), 2nd, 3rd

FOR LOOPS

for loops, 2nd, 3rd

not using variable of, 2nd

overflow, 2nd

wrong direction of, 2nd

FOR-EACH LOOP

for-each loop, 2nd, 3rd

FOREACH() METHOD (COLLECTION INTERFACE)

forEach() method (Collection interface), 2nd

FOREACHORDERED() METHOD (STREAM INTERFACE)

forEachOrdered() method (Stream interface), 2nd

FORI LIVE TEMPLATE

fori live template

FORKJOINPOOL CLASS

ForkJoinPool class

FORMAT SPECIFIERS, INCORRECT IN DATE FORMATTING

format specifiers, incorrect in date formatting

FORMAT() METHOD

format() method

of String class

FORMATTED() METHOD (STRING CLASS)

formatted() method (String class), 2nd

FORR POSTFIX TEMPLATE

forr postfix template

FUTURE INTERFACE

Future interface

GET() METHOD

get() method

of AtomicInteger class

of Future interface

of List interface, 2nd

of Map interface, 2nd

of WeakReference class

GET/PUT SEQUENCE

get/put sequence

GETATTRIBUTE() METHOD (ELEMENT INTERFACE)

getAttribute() method (Element interface)

GETBOOLEAN() METHOD (BOOLEAN CLASS)

getBoolean() method (Boolean class)

GETCHARACTERINSTANCE() METHOD (BREAKITERATOR CLASS)

getCharacterInstance() method (BreakIterator class)

GETCLASS() METHOD

getClass() method, 2nd, 3rd

GETDECLARINGCLASS() METHOD (ENUM INTERFACE)

getDeclaringClass() method (Enum interface)

GETHOUR() METHOD (LOCALDATETIME CLASS)

getHour() method (LocalDateTime class)

GETMETHOD() METHOD (CLASS CLASS)

getMethod() method (Class class)

GETNUMBERINSTANCE() METHOD (NUMBERFORMAT CLASS)

getNumberInstance() method (NumberFormat class)

GOOGLE JAVA STYLE GUIDE

Google Java Style Guide

GRADLE RUNIDE COMMAND

gradle runIde command

GUAVA LIBRARY

Guava library, 2nd, 3rd, 4th, 5th, 6th

HASATTRIBUTE() METHOD (ELEMENT INTERFACE)

hasAttribute() method (Element interface)

HASHCODE() CALLED ON ARRAY INSPECTION

hashCode() Called on Array inspection

HASHCODE() METHOD

hashCode() method, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th

StackOverflowError when computing

for case-insensitive string, 2nd

in URL class, 2nd

in array, 2nd, 3rd

in mutable objects, 2nd

HASHMAP CLASS

HashMap class

HASHMAP KEY

HashMap key, 2nd

HASHSET CLASS

HashSet class, 2nd, 3rd

HASNEXT() METHOD (ITERATOR INTERFACE)

hasNext() method (Iterator interface), 2nd

HEXADECIMAL VALUES

hexadecimal values

HEXFORMAT CLASS

HexFormat class

IC (INTELLIJ IDEA COMMUNITY EDITION)

IC (IntelliJ IDEA Community Edition)

IDENTITYHASHMAP CLASS

IdentityHashMap class

IF STATEMENT

if statement, 2nd, 3rd, 4th, 5th, 6th, 7th

IFEMPTY() METHOD (STREAMEX CLASS)

ifEmpty() method (StreamEx class)

IF–ELSE CHAINS

if–else chains

IMMUTABLECOLLECTION CLASS

ImmutableCollection class

INDEXOF() METHOD

indexOf() method, 2nd, 3rd, 4th, 5th

checking result of

recursive implementation, 2nd

INDEXOUTOFBOUNDSEXCEPTION

IndexOutOfBoundsException, 2nd, 3rd

INFINITE RECURSION INSPECTION

Infinite Recursion inspection, 2nd

INITIALIZATION

initialization

class initialization order, 2nd

enum initialization loop

incorrect initialization order

subclass fields

INPUTSTREAM.READ() METHOD

InputStream.read() method, 2nd, 3rd

INSPECTION PROFILE

inspection profile

INSTANCEOF OPERATOR

instanceof operator, 2nd, 3rd, 4th, 5th, 6th

and different class loaders, 2nd

dominating condition, 2nd

in equals() implementation

to protect cast, 2nd

INT TYPE

int type, 2nd, 3rd, 4th, 5th

comparison

literal

overflow

INTEGER CLASS

Integer class

compare() method, 2nd

INTEGER DIVISION IN FLOATING POINT CONTEXT INSPECTION

Integer Division in Floating Point Context inspection

INTEGER MULTIPLICATION OR SHIFT IMPLICITLY CAST TO LONG INSPECTION

Integer Multiplication or Shift Implicitly Cast to long inspection, 2nd

INTEGERCACHE CLASS

IntegerCache class

INTELLIJ IDEA

IntelliJ IDEA, 2nd, 3rd, 4th, 5th, 6th

INTELLIJ IDEA INSPECTION

IntelliJ IDEA inspection

Assertion Is Suppressed by catch

Assignment to Static Field from Instance Context

Assignment to for Loop Parameter

Call to String.toUpperCase() or toLowerCase() Without a Locale

Cast Conflicts With instanceof

Comparison to Double.NaN or Float.NaN

Confusing Argument to Varargs Method

Constant Values, 2nd, 3rd, 4th

Fallthrough in Switch Statement

Idempotent Loop Body

Infinite Recursion

Integer Division in Floating Point Context

Integer Multiplication or Shift Implicitly Cast to long, 2nd

Iterable Is Used as Vararg

JUnit Malformed Declaration

Loop Executes Zero or Billions of Times

Malformed Format String

Method Does Not Call Super Method

Mismatched Case in String Operation

Multiple Operators with Different Precedence

Negative int Hexadecimal Constant in long Context

Non-Short-Circuit Boolean Expression

Non-terminal Use of ’\\\s’ Escape Sequence

Null-Check Method Is Called with Obviously Non-null Argument

Nullability and Data Flow Problems, 2nd, 3rd, 4th, 5th, 6th, 7th

Number Comparison Using ==, Instead of equals(), 2nd

Numeric Cast That Loses Precision

Numeric Overflow

Octal Integer

Overridable Method Called During Object Construction

Replacement Operation Has No Effect

Result of Method Call Ignored, 2nd

Return of null

Static Initializer References Subclass

String Comparison Using ==, Instead of equals()

Subtraction in compareTo()

Suspicious Class.getClass() Call

Suspicious Collections Method Calls, 2nd

Suspicious Comparator.compare() Implementation

Suspicious Date Format Pattern

Suspicious List.remove() in the Loop

Suspicious Oddness Check

Suspicious Regex Expression Argument

Suspicious Ternary Operator in Varargs Method Call

Suspicious Usage of Compare Method

Throwable Not Thrown

Too Weak Variable Type Leads to Unnecessary Cast

assert Statement with Side Effects

compare() Method Can Be Used to Compare Numbers

equals() Between Objects of Inconvertible Types, 2nd

equals() Called on Itself

equals() Called on StringBuilder

equals() Called on java.math.BigDecimal

hashCode() Called on Array

INTERRUPTED() METHOD (THREAD CLASS)

interrupted() method (Thread class)

INTSTREAM.RANGECLOSED() METHOD

IntStream.rangeClosed() method

INVOKESTATIC INSTRUCTION

invokestatic instruction

ISDIGIT() METHOD (CHARACTER CLASS)

isDigit() method (Character class), 2nd

ISDIRECTORY() METHOD (FILES CLASS)

isDirectory() method (Files class)

ISEMPTY() METHOD (COLLECTION INTERFACE)

isEmpty() method (Collection interface), 2nd

ISINSTANCE() METHOD (CLASS CLASS)

isInstance() method (Class class)

ISREGULARFILE() METHOD (FILES CLASS)

isRegularFile() method (Files class)

ITERATOR INTERFACE

Iterator interface

hasNext() method, 2nd, 3rd

next() method

remove() method

violating contracts, 2nd

ITERATOR() METHOD (ITERABLE INTERFACE)

iterator() method (Iterable interface)

JAVA CONCURRENCY IN PRACTICE ANNOTATIONS

Java Concurrency in Practice annotations

JAVA LANGUAGE SPECIFICATION (JLS)

Java Language Specification (JLS), 2nd

JAVA SPECIFICATION REQUEST (JSR)

Java Specification Request (JSR)

JAVA VIRTUAL MACHINES (JVMS)

Java virtual machines (JVMs)

JAVA.UTIL.CONCURRENT APIS

java.util.concurrent APIs

JAVAP TOOL

javap tool

JDT ANNOTATIONS FOR ENHANCED NULL ANALYSIS

JDT Annotations for Enhanced Null Analysis

JETBRAINS ANNOTATIONS

JetBrains annotations

JIT (JUST-IN-TIME)

JIT (just-in-time)

JSTACK TOOL

jstack tool

JUNIT MALFORMED DECLARATION INSPECTION

JUnit Malformed Declaration inspection

KEYLISTENER INTERFACE

KeyListener interface

KLOCWORK

Klocwork

LEFT SHIFT

left shift

LENGTH() METHOD (STRING CLASS)

length() method (String class)

LINT

lint

LIST INTERFACE

List interface, 2nd, 3rd, 4th, 5th

add() method

copyOf() method

remove(index) method, 2nd

set() method

sort() method, 2nd

subList() method

LISTITERATOR INTERFACE

ListIterator interface

LOCALDATETIME CLASS

LocalDateTime class

getHour() method

LOCALINSPECTIONTOOL ABSTRACT CLASS

LocalInspectionTool abstract class

LOGICAL OPERATORS && AND ]] | 100_java_mistakes_and_how_to_avoid_them_-_index | logical operators && and | 100_java_mistakes_and_how_to_avoid_them_-_index | , 2nd LONG TYPE long type, 2nd, 3rd, 4th, 5th, 6th cast to narrowing overflow LOOP loop idempotent body of, 2nd not using variable of overflow wrong direction of, 2nd LOOP EXECUTES ZERO OR BILLIONS OF TIMES INSPECTION Loop Executes Zero or Billions of Times inspection MAIN() METHOD main() method, 2nd MALFORMED FORMAT STRING INSPECTION Malformed Format String inspection MAP INTERFACE Map interface, 2nd compute() method computeIfAbsent() method, 2nd, 3rd, 4th, 5th, 6th, 7th computeIfPresent() method merge() method, 2nd, 3rd put() method, 2nd, 3rd putIfAbsent() method, 2nd MAP() METHOD (STREAM INTERFACE) map() method (Stream interface), 2nd MAPS maps concurrent modification during iteration, 2nd MATH UTILITY CLASS Math utility class *Exact methods abs() method, 2nd, 3rd absExact() method clamp() method floorMod() method, 2nd, 3rd hypot() method min() method sqrt() method, 2nd toIntExact() method MAX() METHOD max() method in Collections utility class, 2nd in Math utility class MAXBY() METHOD (COLLECTORS CLASS) maxBy() method (Collectors class) MERGE() METHOD (MAP INTERFACE) merge() method (Map interface), 2nd METHOD DOES NOT CALL SUPER METHOD INSPECTION Method Does Not Call Super Method inspection METHOD REFERENCES method references, 2nd MIN() METHOD min() method in Collections utility class, 2nd in Math utility class MISMATCHED CASE IN STRING OPERATION INSPECTION Mismatched Case in String Operation inspection MODCOUNT FIELD modCount field MOUNT --RBIND COMMAND mount --rbind command MULTIPLE OPERATORS WITH DIFFERENT PRECEDENCE INSPECTION Multiple Operators with Different Precedence inspection MUTABLE OBJECTS, AS KEYS mutable objects, as keys, 2nd MUTATION COVERAGE mutation coverage MVN INSTALL COMMAND mvn install command MVN PACKAGE COMMAND mvn package command NAN VALUES NaN values, 2nd NEGATIVE INT HEXADECIMAL CONSTANT IN LONG CONTEXT INSPECTION Negative int Hexadecimal Constant in long Context inspection NEGATIVE NUMBERS negative numbers due to overflow hexadecimal in byte type result of Math.abs() method, 2nd NEW EXPRESSION new expression NEWLY CREATED OBJECTS newly created objects NON-NULLABLE VARIABLES non-nullable variables NON-SHORT-CIRCUIT BOOLEAN EXPRESSION INSPECTION Non-Short-Circuit Boolean Expression inspection NON-SHORT-CIRCUIT LOGIC OPERATORS non-short-circuit logic operators, 2nd NON-TERMINAL USE OF ’\\\S’ ESCAPE SEQUENCE INSPECTION Non-terminal Use of ’\\\s’ Escape Sequence inspection NULL ELEMENTS null elements, 2nd, 3rd NULL VALUES null values in maps, 2nd NULL-CHECK METHOD IS CALLED WITH OBVIOUSLY NON-NULL ARGUMENT INSPECTION Null-Check Method Is Called with Obviously Non-null Argument inspection NULLABILITY AND DATA FLOW PROBLEMS INSPECTION Nullability and Data Flow Problems inspection, 2nd, 3rd, 4th, 5th, 6th NULLPOINTEREXCEPTION NullPointerException, 2nd, 3rd, 4th, 5th, 6th, 7th defensive checks, 2nd nullity annotations, 2nd static analysis NULLS nulls nullity annotations searching for in null-hostile collection NULLSFIRST() METHOD (COMPARATOR INTERFACE) nullsFirst() method (Comparator interface), 2nd NUMBER CLASS Number class NUMBER COMPARISON USING ==, INSTEAD OF EQUALS() INSPECTION Number Comparison Using ==, Instead of equals() inspection NUMBERS numbers Integer.MIN_VALUE, 2nd bit-manipulating algorithms, 2nd clamping order division and compound assignment negative hexadecimal values oddness check and negative numbers rounding during integer division special floating-point numbers, 2nd NUMERIC CAST THAT LOSES PRECISION INSPECTION Numeric Cast That Loses Precision inspection NUMERIC OPERATOR PRECEDENCE numeric operator precedence, 2nd binary shift bitwise operators NUMERIC OVERFLOW numeric overflow assigning result of int multiplication to long variable file size, time, and financial computations, 2nd NUMERIC OVERFLOW INSPECTION Numeric Overflow inspection OBJECT CLASS Object class, 2nd comparing objects equals() method, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th hashCode() method, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th malformed implementation, 2nd toString() method using on unrelated types OBJECTS objects comparing comparing, 2nd, 3rd, 4th, 5th not using newly created searching of unrelated type OBJECTS CLASS Objects class checkFromIndexSize() method checkFromToIndex() method checkIndex() method equals() method, 2nd hash() method, 2nd requireNonNullElse() method OCTAL INTEGER INSPECTION Octal Integer inspection OCTAL LITERALS octal literals OPCODESTACK.ITEM CLASS OpcodeStack.Item class OPCODESTACKDETECTOR CLASS OpcodeStackDetector class OPTIONAL CLASS Optional class, 2nd OR ( | 100_java_mistakes_and_how_to_avoid_them_-_index | ) OPERATOR or ( | 100_java_mistakes_and_how_to_avoid_them_-_index | ) operator OVERFLOW overflow numeric PAIR PROGRAMMING pair programming PARALLELSTREAM() METHOD (COLLECTION INTERFACE) parallelStream() method (Collection interface) PARENTHESES, MISSING IN CONDITIONS parentheses, missing in conditions && and | 100_java_mistakes_and_how_to_avoid_them_-_index | replace Should Be Preferred to String#replaceAll StringBuilder and StringBuffer Should Not Be Instantiated with a Character Strings and Boxed Types Should Be Compared Using equals() The Value Returned From a Stream Read Should Be Checked URL.hashCode and URL.equals Should Be Avoided Week Year (YYYY) Should Not Be Used for Date Formatting equals(Object obj) Should Test Argument Type for Loop Stop Conditions Should Be Invariant indexOf Checks Should Not Be for Positive Numbers min and max Used in Combination Should not Always Return the Same Value null Should Not Be Used with Optional SORT() METHOD (LIST INTERFACE) sort() method (List interface), 2nd SPLIT() METHOD (STRING CLASS) split() method (String class) SPOTBUGS SpotBugs, 2nd SPOTBUGS WARNING SpotBugs warning Bad Attempt to Compute Absolute Value of Signed 32-bit Hashcode Bad Attempt to Compute Absolute Value of Signed Random Integer Check for Oddness That Won’t Work for Negative Numbers Code Checks for Specific Values Returned by compareTo Computation of Average Could Overflow Exception Created and Dropped Rather than Thrown Impossible Cast and Impossible Downcast Incorrect Combination of Math.max and Math.min Method With Optional Return Type Returns Explicit null Result of Integer Multiplication Cast to Long Switch Statement Found Where One Case Falls Through to the Next Case Unchecked/Unconfirmed Cast Unchecked/Unconfirmed Cast of Return Value from Method SS (GERMAN LETTER) ß (German letter) SSR (STRUCTURAL SEARCH AND REPLACEMENT), IN INTELLIJ IDEA SSR (Structural Search and Replacement), in IntelliJ IDEA STACK CLASS Stack class STACKOVERFLOWERROR StackOverflowError deep but finite recursion, 2nd infinite recursion, 2nd STANDALONE EXPRESSIONS standalone expressions STARTSWITH() METHOD (STRING CLASS) startsWith() method (String class) STATIC ANALYSIS static analysis Error Prone plugins, 2nd IDEA plugin, 2nd SpotBugs plugins, 2nd limitations of, 2nd plugins using, 2nd warnings, 2nd, 3rd, 4th, 5th, 6th STATIC ANALYZERS static analyzers, 2nd STATIC FIELDS static fields, 2nd accidental declaration of, 2nd STREAM API Stream API consuming stream twice, 2nd violating contract of operations STREAM INTERFACE Stream interface, 2nd, 3rd, 4th count() method, 2nd, 3rd filter() method limit() method map() method max() method min() method parallel() method peek() method reduce() method, 2nd sequential() method skip() method toArray() method STREAMEX LIBRARY StreamEx library, 2nd, 3rd, 4th STREAMS, NULL VALUES IN streams, null values in STRING CLASS String class format() method, 2nd, 3rd, 4th formatted() method indexOf() method, 2nd length() method regionMatches() method repeat() method replace() method, 2nd, 3rd replaceAll() method, 2nd, 3rd replaceFirst() method split() method startsWith() method toLowerCase() method, 2nd toUpperCase() method, 2nd, 3rd STRING LITERALS, MULTILINE string literals, multiline STRINGBUILDER CLASS StringBuilder class append() method appendCodePoint() method constructor, 2nd passing char to constructor STRINGBUILDER CONSTRUCTOR CALL WITH CHAR ARGUMENT WARNING StringBuilder Constructor Call with char Argument warning STRINGINDEXOUTOFBOUNDSEXCEPTION StringIndexOutOfBoundsException, 2nd STRINGS strings case conversions comparing in different case escape sequences, 2nd incorrect Boolean conversion mismatched format arguments, 2nd mixing arguments of indexOf() regular expressions STRINGUTILS CLASS StringUtils class substringAfter() method STRIPTRAILINGZEROS() METHOD (BIGDECIMAL CLASS) stripTrailingZeros() method (BigDecimal class) SUBLIST() METHOD (LIST INTERFACE) subList() method (List interface) SUBSTRING() METHOD (STRING CLASS) substring() method (String class) SUBTRACTION IN COMPARETO() INSPECTION Subtraction in compareTo() inspection SUBTRACTION, USING WHEN COMPARING NUMBERS subtraction, using when comparing numbers SUPERCLASS METHOD CALLS superclass method calls SURROGATE PAIR surrogate pair, 2nd SUSPICIOUS CLASS.GETCLASS() CALL INSPECTION Suspicious Class.getClass() Call inspection SUSPICIOUS COLLECTIONS METHOD CALLS INSPECTION Suspicious Collections Method Calls inspection, 2nd SUSPICIOUS COMPARATOR.COMPARE() IMPLEMENTATION INSPECTION Suspicious Comparator.compare() Implementation inspection SUSPICIOUS DATE FORMAT PATTERN INSPECTION Suspicious Date Format Pattern inspection SUSPICIOUS LIST.REMOVE() IN THE LOOP INSPECTION Suspicious List.remove() in the Loop inspection SUSPICIOUS ODDNESS CHECK INSPECTION Suspicious Oddness Check inspection SUSPICIOUS TERNARY OPERATOR IN VARARGS METHOD CALL INSPECTION Suspicious Ternary Operator in Varargs Method Call inspection SUSPICIOUS USAGE OF COMPARE METHOD INSPECTION Suspicious Usage of Compare Method inspection SWITCH EXPRESSIONS switch expressions SWITCH STATEMENT switch statement, 2nd, 3rd, 4th accidental pass through TDD (TEST-DRIVEN DEVELOPMENT) TDD (test-driven development) TERNARY OPERATOR ternary operator, 2nd TESTNG FRAMEWORK TestNG framework THEN BRANCH then branch THROW STATEMENT throw statement THROWABLE CLASS Throwable class THROWABLE NOT THROWN INSPECTION Throwable Not Thrown inspection TIMEUNIT ENUM TimeUnit enum TIMSORT ALGORITHM TimSort algorithm, 2nd TITIN PROTEIN titin protein TOLIST() METHOD (STREAM INTERFACE) toList() method (Stream interface) TOO WEAK VARIABLE TYPE LEADS TO UNNECESSARY CAST INSPECTION Too Weak Variable Type Leads to Unnecessary Cast inspection TOSTRING() METHOD toString() method TOUPPERCASE() METHOD (STRING CLASS) toUpperCase() method (String class) TRANSITIVITY transitivity TREESET CLASS TreeSet class TRUE CONSTANT (BOOLEAN CLASS) TRUE constant (Boolean class) TYPE CONVERSION, IMPLICIT type conversion, implicit, 2nd boxed numbers in conditional expressions, 2nd in compound assignments nested conditional expressions UNARY MINUS unary minus UNARY PLUS unary plus UNCHECKED CALLS unchecked calls UNCONDITIONAL NARROWING unconditional narrowing UNICODE CHARACTERS Unicode characters, 2nd UNIT TESTING unit testing assertNotEquals() method ignoring AssertionError in, 2nd malformed assertion method calls malformed exception test malformed test methods premature exit from test method UNMODIFIABLE COLLECTIONS unmodifiable collections UNMODIFIABLECOLLECTION() METHOD (COLLECTIONS CLASS) unmodifiableCollection() method (Collections class) UNMODIFIABLELIST() METHOD (COLLECTIONS CLASS) unmodifiableList() method (Collections class), 2nd UNSIGNED HEXADECIMAL unsigned hexadecimal UNSIGNED RIGHT SHIFT unsigned right shift UPDATEANDGET() METHOD (ATOMICINTEGER CLASS) updateAndGet() method (AtomicInteger class) URI CLASS URI class , 2nd URL CLASS URL class URLCLASSLOADER CLASS URLClassLoader class VALUES() METHOD (ENUM CLASS) values() method (enum class), 2nd VAR KEYWORD var keyword VARIABLE ARITY CALLS variable arity calls, 2nd, 3rd ambiguous mixing array and collection using primitive array in VISITMETHODCALLEXPRESSION() METHOD (JAVAELEMENTVISITOR CLASS) visitMethodCallExpression() method (JavaElementVisitor class) WEAK REFERENCES weak references, 2nd WEAKREFERENCE CLASS WeakReference class WIDENING widening, 2nd, 3rd, 4th XLINT\ Xlint\ rawtypes command line option ---- ==Fair Use Sources== [[Fair Use Sources:

• 100 Java Mistakes and How to Avoid Them on DuckDuckGo
• B0CTHRGJH3 2024

Java Programming Language, Java Virtual Machine (JVM), Java Development Kit (JDK), Java Runtime Environment (JRE), Java Class, Java Interface, Java Method, Java Object, Java Package, Java String, Java Integer, Java Array, Java List, Java Map, Java Set, Java Exception, Java Thread, Java Synchronization, Java Generic, Java Annotation, Java Stream, Java Lambda Expression, Java Inheritance, Java Polymorphism, Java Encapsulation, Java Abstraction, Java Access Modifier, Java Constructor, Java Overloading, Java Overriding, Java Collection Framework, Java ArrayList, Java HashMap, Java HashSet, Java LinkedList, Java TreeMap, Java TreeSet, Java Iterator, Java Enumeration, Java File, Java InputStream, Java OutputStream, Java Reader, Java Writer, Java BufferedReader, Java BufferedWriter, Java PrintWriter, Java PrintStream, Java Scanner, Java StringBuilder, Java StringBuffer, Java Character, Java Boolean, Java Double, Java Float, Java Byte, Java Short, Java Long, Java BigInteger, Java BigDecimal, Java ClassLoader, Java Reflection, Java Proxy, Java Dynamic Proxy, Java Inner Class, Java Static Nested Class, Java Anonymous Class, Java Enum, Java Autoboxing, Java Auto-Unboxing, Java Garbage Collection, Java Memory Model, Java Just-In-Time Compilation, Java Classpath, Java Module, Java Module Path, Java Record, Java Sealed Class, Java Switch Expression, Java Pattern Matching for instanceof, Java Text Block, Java Var Keyword, Java Interface Default Method, Java Interface Static Method, Java Functional Interface, Java SAM (Single Abstract Method) Interface, Java Optional, Java Stream API, Java Collectors, Java Parallel Streams, Java Concurrency Package, Java Executor, Java ExecutorService, Java Future, Java CompletableFuture, Java ForkJoinPool, Java ReentrantLock, Java Semaphore, Java CountDownLatch, Java CyclicBarrier, Java Phaser, Java BlockingQueue, Java ConcurrentHashMap, Java AtomicInteger, Java AtomicLong, Java AtomicReference, Java AtomicBoolean, Java Lock Interface, Java ReadWriteLock, Java Condition, Java ThreadLocal, Java Synchronized Keyword, Java Volatile Keyword, Java Notify, Java Wait, Java Monitor, Java ReentrantReadWriteLock, Java ConcurrentLinkedQueue, Java PriorityQueue, Java Deque, Java ArrayDeque, Java SortedMap, Java SortedSet, Java NavigableMap, Java NavigableSet, Java EnumSet, Java EnumMap, Java WeakHashMap, Java LinkedHashMap, Java LinkedHashSet, Java IdentityHashMap, Java TreeMap Comparator, Java HashCode, Java Equals Method, Java CompareTo Method, Java Cloneable Interface, Java Serializable Interface, Java Externalizable Interface, Java Serialization Mechanism, Java ObjectOutputStream, Java ObjectInputStream, Java Transient Keyword, Java Persistence, Java JDBC (Java Database Connectivity), Java SQL Package, Java PreparedStatement, Java ResultSet, Java DriverManager, Java Connection, Java Statement, Java CallableStatement, Java RowSet, Java Bean, Java PropertyDescriptor, Java Introspector, Java BeanInfo, Java Enterprise Edition, Java Servlet, Java ServletContext, Java HttpServlet, Java HttpServletRequest, Java HttpServletResponse, Java Session, Java Filter, Java Listener, Java JSP (Java Server Pages), Java Expression Language, Java JSTL (JavaServer Pages Standard Tag Library), Java JDBC RowSet, Java DataSource, Java JNDI (Java Naming and Directory Interface), Java RMI (Remote Method Invocation), Java RMI Registry, Java RMI Stub, Java RMI Skeleton, Java RMI Remote Interface, Java CORBA Support, Java IDL, Java NamingException, Java InitialContext, Java Context Lookup, Java Message Service (JMS), Java Mail API, Java Bean Validation, Java Security Manager, Java Policy, Java Permission, Java AccessController, Java PrivilegedAction, Java KeyStore, Java TrustStore, Java SSLContext, Java Cipher, Java MessageDigest, Java KeyFactory, Java SecretKey, Java PublicKey, Java PrivateKey, Java Certificate, Java SecureRandom, Java SecureClassLoader, Java GSS-API (Generic Security Services), Java SASL (Simple Authentication and Security Layer), Java JAAS (Java Authentication and Authorization Service), Java Kerberos Integration, Java PKI (Public Key Infrastructure), Java JCE (Java Cryptography Extension), Java JCA (Java Cryptography Architecture), Java AWT (Abstract Window Toolkit), Java Swing, Java JFrame, Java JPanel, Java JLabel, Java JButton, Java JTextField, Java JTextArea, Java JScrollPane, Java JList, Java JComboBox, Java JTable, Java JTree, Java JDialog, Java JOptionPane, Java JProgressBar, Java JSlider, Java JSpinner, Java BoxLayout, Java BorderLayout, Java FlowLayout, Java GridLayout, Java GridBagLayout, Java CardLayout, Java LayoutManager, Java Drag and Drop, Java Clipboard, Java ImageIO, Java BufferedImage, Java Graphics2D, Java Font, Java Color, Java GradientPaint, Java TexturePaint, Java Stroke, Java Shape, Java AffineTransform, Java Path2D, Java BasicStroke, Java RenderingHints, Java GraphicsEnvironment, Java Robot, Java PrintService, Java PrinterJob, Java Paint Event, Java SwingUtilities, Java Pluggable LookAndFeel, Java Metal LookAndFeel, Java Nimbus LookAndFeel, Java Accessibility API, Java Sound API, Java MIDI, Java Clip, Java AudioInputStream, Java Sequencer, Java Synthesizer, Java Line, Java Port, Java Mixer, Java DataLine, Java Applet, Java Web Start, Java FX (JavaFX), Java SceneGraph, Java Node (JavaFX), Java Stage (JavaFX), Java Scene (JavaFX), Java Pane (JavaFX), Java GridPane, Java BorderPane, Java HBox, Java VBox, Java StackPane, Java AnchorPane, Java FlowPane, Java TilePane, Java Label (JavaFX), Java Button (JavaFX), Java TextField (JavaFX), Java TextArea (JavaFX), Java ChoiceBox, Java ComboBox (JavaFX), Java ListView, Java TableView, Java TreeView, Java WebView, Java Observable, Java Property (JavaFX), Java Binding (JavaFX), Java CSS (JavaFX), Java FXML, Java MediaPlayer, Java SwingNode, Java HTMLEditor (JavaFX), Java Concurrency in JavaFX, Java ScheduledExecutorService, Java Timer, Java TimerTask, Java ThreadPoolExecutor, Java WorkStealingPool, Java Callable, Java Runnable, Java FutureTask, Java LockSupport, Java Phaser Parties, Java Thread Dump, Java Heap Dump, Java Flight Recorder, Java Mission Control, Java JVMTI (JVM Tool Interface), Java JMX (Java Management Extensions), Java MBean, Java MBeanServer, Java MXBean, Java GarbageCollectorMXBean, Java MemoryMXBean, Java OperatingSystemMXBean, Java ThreadMXBean, Java CompilationMXBean, Java ClassLoadingMXBean, Java PlatformManagedObject, Java Instrumentation API, Java Attach API, Java JVMDebugger, Java JDWP (Java Debug Wire Protocol), Java JDI (Java Debug Interface), Java JShell, Java Scripting API, Java Nashorn (JavaScript Engine), Java XML Processing, Java DOM Parser, Java SAX Parser, Java StAX Parser, Java JAXB (Java Architecture for XML Binding), Java JAXP (Java API for XML Processing), Java SOAP, Java JAX-WS (Java API for XML Web Services), Java RESTful Web Services (JAX-RS), Java JSON Processing (JSON-P), Java JSON Binding (JSON-B), Java CDI (Contexts and Dependency Injection), Java EJB (Enterprise JavaBeans), Java JMS (Java Message Service), Java JTA (Java Transaction API), Java Bean Validation (JSR 380), Java Dependency Injection Frameworks, Java Spring Framework, Java Spring Boot, Java Hibernate (Java Persistence Framework), Java JPA (Java Persistence API), Java JAX-RPC (Java API for XML-based RPC), Java AppServer, Java GlassFish, Java WildFly, Java Liberty Profile, Java Tomcat, Java Jetty, Java Undertow, Java OSGi (Open Service Gateway Initiative), Java Pax Exam, Java RAP (Remote Application Platform), Java RCP (Rich Client Platform), Java Equinox, Java Tycho Build, Java Lombok, Java Guava, Java SLF4J (Simple Logging Facade for Java), Java Logback, Java JUL (Java Util Logging), Java Log4j, Java Commons Collections, Java Commons IO, Java Commons Lang, Java HTTPClient, Java URLConnection, Java URI Class, Java URL Class, Java Cookie Handler, Java HTTPServer, Java WebSocket API, Java AppletViewer, Java RMIClassLoader, Java JVMPauseDetector, Java Memory Settings, Java System Properties, Java Environment Variables (As Accessed by Java), Java ServiceLoader, Java SPI (Service Provider Interface), Java Instrumentation Rewriting, Java Agent Attaching, Java Runtime Exec, Java ProcessHandle, Java ProcessBuilder, Java ScriptingEngineManager, Java ScriptEngine, Java ScriptContext, Java CompiledScript, Java FX Application Thread, Java FXProperty, Java FXObservableValue, Java FXKeyFrame, Java FXTimeline, Java FXTransition, Java FXImageView, Java FXCanvas, Java FX3D Features, Java AOT Compilation (jaotc), Java GraalVM Integration, Java JNI (Java Native Interface), Java NIO (Non-Blocking I/O), Java Path, Java Files Class, Java FileSystem, Java FileChannel, Java AsynchronousFileChannel, Java Socket, Java ServerSocket, Java DatagramSocket, Java MulticastSocket, Java SocketChannel, Java ServerSocketChannel, Java DatagramChannel, Java Pipe, Java FileLock, Java MappedByteBuffer, Java CharsetDecoder, Java CharsetEncoder, Java SecretKeySpec, Java KeySpec, Java KeyPair, Java KeyAgreement, Java KeyGenerator, Java Mac (Message Authentication Code), Java PolicySpi, Java SecureRandomSpi, Java CertPath, Java CertPathBuilder, Java CertPathValidator, Java TrustManager, Java KeyManager, Java SSLSession, Java SSLSocket, Java SSLServerSocket, Java SSLEngine, Java SSLParameters, Java HttpsURLConnection, Java DomainCombiner, Java Principal, Java Subject, Java LoginContext, Java CallbackHandler, Java TextField (Swing), Java TextPane, Java StyledDocument, Java AttributeSet, Java StyleConstants, Java AbstractDocument, Java DocumentFilter, Java Caret, Java Highlighter, Java UndoManager, Java DefaultStyledDocument, Java ViewFactory, Java EditorKit, Java KeyStroke, Java ActionMap, Java InputMap, Java RootPane, Java GlassPane, Java LayeredPane, Java MenuBar, Java MenuItem, Java JMenu, Java JMenuItem, Java JCheckBoxMenuItem, Java JRadioButtonMenuItem, Java PopupMenu, Java Popup, Java TooltipManager, Java DesktopManager, Java InternalFrame, Java InternalFrameUI, Java InternalFrameAdapter, Java DockingFrames, Java SystemTray, Java TrayIcon, Java Robot Class, Java PrintServiceLookup, Java FlavorMap, Java Transferable, Java DataFlavor, Java DragGestureRecognizer, Java DropMode, Java DropTargetAutoScroll, Java DropTargetContext, Java DropTargetListener, Java DropTargetDragEvent, Java DropTargetDropEvent, Java BasicLookAndFeel Class, Java SynthLookAndFeel, Java UIDefaults, Java UIManager, Java ClientPropertyKey, Java ImageIOSpi, Java ImageWriter, Java ImageReader, Java ImageInputStream, Java ImageOutputStream, Java IIOMetadata, Java BufferedImageOp, Java ColorModel, Java WritableRaster, Java IndexColorModel, Java Raster, Java RenderedImage, Java WritableRenderedImage, Java ImageTranscoder, Java ImageWriterSpi, Java ImageReaderSpi, Java Soundbank, Java MidiChannel, Java MidiDevice, Java MidiEvent, Java Sequence, Java MidiFileFormat, Java SoundFont, Java AudioSystem, Java AudioFormat, Java DataLine.Info, Java LineEvent, Java LineListener, Java Clip Class, Java SourceDataLine, Java TargetDataLine, Java Port.Info, Java Mixer.Info, Java Gervill (SoftSynthesizer), Java AccessBridge, Java AWTEvent, Java KeyEvent, Java MouseEvent, Java FocusEvent, Java WindowEvent, Java ComponentEvent, Java AdjustmentEvent, Java ContainerEvent, Java InputMethodEvent, Java HierarchyEvent, Java InvocationEvent, Java PaintEvent, Java DropTargetEvent, Java Peer Interface, Java AWTEventMulticaster, Java Toolkit, Java Desktop, Java GraphicsConfiguration, Java GraphicsDevice, Java AWTKeyStroke, Java TextHitInfo, Java TextLayout, Java TextAttribute, Java FontRenderContext, Java AttributedString, Java LineBreakMeasurer, Java Bidi, Java BreakIterator, Java Collator, Java Locale, Java ResourceBundle, Java Formatter, Java Format Conversion, Java SimpleDateFormat, Java DecimalFormat, Java MessageFormat, Java ChoiceFormat, Java ScannerDelimiter, Java System.Logger, Java Logger, Java Level, Java LogRecord, Java ConsoleHandler, Java FileHandler, Java MemoryHandler, Java SocketHandler, Java SimpleFormatter, Java XMLFormatter, Java Preferences, Java PreferenceChangeEvent, Java NodeChangeEvent, Java PrinterException, Java PrinterAbortException, Java PrintException, Java PrintQuality, Java PrintServiceAttribute, Java ServiceUI, Java Pageable, Java Printable, Java Book, Java TablePrintable, Java StreamPrintService, Java StreamPrintServiceFactory, Java Filer (Annotation Processing), Java Messager, Java ProcessingEnvironment, Java Element, Java ElementKind, Java ElementVisitor, Java PackageElement, Java TypeElement, Java VariableElement, Java ExecutableElement, Java AnnotationMirror, Java AnnotationValue, Java AnnotationProcessor, Java RoundEnvironment, Java TypeMirror, Java DeclaredType, Java ArrayType, Java TypeVariable, Java WildcardType, Java NoType, Java ErrorType, Java UnionType, Java IntersectionType, Java JavacTool, Java StandardJavaFileManager, Java Diagnostic, Java DiagnosticCollector, Java ForwardingJavaFileManager, Java ForwardingJavaFileObject, Java ForwardingJavaFileObject, Java SPI ServiceLoader, Java ToolProvider, Java DocumentationTool, Java JavaCompiler, Java JShellTool, Java DiagnosticListener, Java CompilationTask, Java ModuleElement, Java ModuleLayer, Java ModuleDescriptor, Java ModuleFinder

OLD before GPT Pro: Abstract Classes, Abstract Methods, Abstract Window Toolkit, Access Control Exception, Access Modifiers, Accessible Object, AccessController Class, Action Event, Action Listener, Action Performed Method, Adapter Classes, Adjustment Event, Adjustment Listener, Annotation Processing Tool, Annotations, AnnotationTypeMismatchException, Anonymous Classes, Applet Class, Applet Context, Applet Lifecycle Methods, Application Class Data Sharing, Array Blocking Queue, Array Index Out of Bounds Exception, Array List, Array Store Exception, Arrays Class, Assertion Error, Assertions, Assignment Operator, Asynchronous File Channel, Atomic Boolean, Atomic Integer, Atomic Long, Atomic Reference, Attribute Set, Audio Clip, Authentication Mechanisms, Auto Closeable Interface, Auto Boxing, AWT Components, AWT Event Queue, AWT Listeners, AWT Toolkit, Backing Store, Background Compilation, Batch Updates, Bean Context, Bean Descriptors, Bean Info, Big Decimal Class, Big Integer Class, Binary Compatibility, Binding Utilities, Bit Set Class, Bitwise Operators in Java, Blocking Queue Interface, Boolean Class, Bounded Wildcards, Breakpoint, Buffered Input Stream, Buffered Output Stream, Buffered Reader, Buffered Writer, BufferOverflowException, BufferUnderflowException, Button Class, Byte Array Input Stream, Byte Array Output Stream, Byte Order, ByteBuffer Class, Bytecode Instructions, Bytecode Verifier, Callable Interface, Callable Statement, Calendar Class, Canvas Class, Card Layout, Caret Listener, Case Sensitivity in Java, Casting in Java, Catch Block, Certificate Exception, Character Class, Character Encoding, Character Set, Character.UnicodeBlock, Charset Class, Checked Exceptions, Checkbox Class, Choice Component, Class Class, Class Files, Class Loader, Class Loader Hierarchy, Class Loading Mechanism, Class Not Found Exception, Class Object, Class Path, ClassCastException, ClassCircularityError, ClassFormatError, ClassLoader, ClassNotFoundException, Clone Method, CloneNotSupportedException, Cloneable Interface, Clipboard Class, Cloneable Interface, ClosedChannelException, Collections Framework, Collections Utility Class, Collector Interface, Collectors Class, Color Class, Column Major Order, Comparable Interface, Comparator Interface, Compiler API, Compiler Directives, Compiler Optimization, Component Class, Component Event, Component Listener, Composite Pattern, ConcurrentHashMap, ConcurrentLinkedQueue, ConcurrentModificationException, ConcurrentNavigableMap, ConcurrentSkipListMap, ConcurrentSkipListSet, Condition Interface, Connection Interface, Console Class, Constructor Overloading, Consumer Interface, Container Class, ContainerEvent, Content Handler, ContentHandlerFactory, Context Class Loader, Continue Statement, Control Flow Statements, CountDownLatch Class, CRC32 Class, Credential Management, Critical Section, CyclicBarrier Class, Daemon Threads, Data Class, Data Input Interface, Data Input Stream, Data Output Interface, Data Output Stream, Data Truncation Exception, Date Class, Daylight Saving Time Handling, Deadlock in Java, Debugging Techniques, DecimalFormat Class, Default Methods in Interfaces, Deflater Class, Deprecated Annotation, Design Patterns in Java, Desktop Class, Diamond Operator, Dialog Class, Dictionary Class, DigestInputStream, DigestOutputStream, Direct Byte Buffer, DirectoryStream Interface, Document Object Model, DOM Parsing in Java, Double Brace Initialization, Double Class, Drag and Drop API, Driver Manager, Drop Shadow Effect, Dynamic Binding, Dynamic Proxy Classes, Element Interface, Ellipse2D Class, EmptyStackException, Encapsulation in Java, Enum Classes, Enum Constant, EnumSet Class, Enumeration Interface, EOFException, Error Handling in Java, Error Prone Practices, Event Delegation Model, Event Handling Mechanism, Event Listener Interfaces, Event Object, Event Queue, EventQueue Class, Exception Chaining, Exception Handling Mechanism, Executable Jar Files, Executor Interface, Executor Service, Executors Class, Expression Evaluation, Extends Keyword, Externalizable Interface, File Class, File Channel, File Descriptor, File Filter Interface, File Input Stream, File Lock Mechanism, File Output Stream, File Permission, File Reader, File Writer, FileDialog Class, FilenameFilter Interface, FileNotFoundException, Final Classes, Final Keyword, Finally Block, Finalize Method, Finalizer Guardian Idiom, Float Class, Flow Layout, Flow API, Focus Listener, Font Class, For Each Loop, ForkJoinPool Class, Formatter Class, Frame Class, Functional Interfaces, Future Interface, FutureTask Class, Garbage Collection Mechanism, Garbage Collector, Generics in Java, Generic Methods, Generic Types, Geometry Classes, Glyph Vector, GradientPaint Class, Graphics Class, Graphics2D Class, Grid Bag Constraints, Grid Bag Layout, Grid Layout, GregorianCalendar Class, Group Layout, GUI Components in Java, GZIPInputStream, GZIPOutputStream, Hash Collision, Hash Function, Hash Map Class, Hash Set Class, Hashtable Class, HashCode Method, Headless Exception, Heap Memory, Hello World Program in Java, Hierarchical Inheritance, High-Level Concurrency API, HTTP Client in Java, HTTP Server in Java, Icon Interface, Identifier Naming Convention, If Statement, IllegalArgumentException, IllegalMonitorStateException, IllegalStateException, IllegalThreadStateException, Image Class, ImageIcon Class, Immutable Classes, Import Statement, InaccessibleObjectException, Inheritance in Java, InitialContext Class, Inner Classes, Input Method Framework, Input Stream, InputStreamReader Class, Instance Initializer Block, Instance Variables, InstantiationException, Integer Class, Integer Overflow and Underflow, InterruptedException, InterruptedIOException, Interface in Java, InternalError, Internationalization, IO Exception, IO Streams in Java, Iterable Interface, Iterator Interface, Jar Entry, Jar File, JarInputStream Class, JarOutputStream Class, Java Access Bridge, Java Annotations, Java API Documentation, Java Applets, Java Archive (JAR), Java Beans, Java Bytecode, Java Class Library, Java Collections Framework, Java Community Process, Java Compiler, Java Database Connectivity (JDBC), Java Development Kit (JDK), Java Documentation Comments, Java Flight Recorder, Java Garbage Collector, Java Generics, Java Memory Model, Java Native Interface (JNI), Java Naming and Directory Interface (JNDI), Java Network Launching Protocol (JNLP), Java Platform, Java Plugin, Java Reflection API, Java Remote Method Invocation (RMI), Java Runtime Environment (JRE), Java Security Manager, Java Serialization, Java Server Pages (JSP), Java Stream API, Java Swing, Java Virtual Machine (JVM), Java Web Start, JavaFX Platform, javax Package, Javadoc Tool, JAR Signing Mechanism, JDBC API, JDBC Drivers, JFrame Class, JIT Compiler, JLabel Class, JLayeredPane Class, JList Component, JMenu Component, JOptionPane Class, JPanel Class, JPasswordField Component, JProgressBar Component, JScrollBar Component, JScrollPane Component, JSeparator Component, JSlider Component, JSplitPane Component, JTabbedPane Component, JTable Component, JTextArea Component, JTextField Component, JTextPane Component, JToolBar Component, JTree Component, JVM Arguments, JVM Memory Model, Key Event, Key Listener Interface, Key Stroke Class, KeyException, KeySpec Interface, Keyword in Java, Label Class, Lambda Expressions in Java, Layout Manager, LayoutManager2 Interface, Lazy Initialization, Leaf Nodes, Legacy Classes in Java, LineNumberReader Class, Linked Blocking Queue, Linked Hash Map, Linked Hash Set, Linked List Class, List Interface, List Iterator Interface, Listener Interfaces in Java, Load Factor in HashMap, Locale Class, Lock Interface, Logger Class, Logging API in Java, Long Class, Main Method in Java, MalformedURLException, Map Interface, Map.Entry Interface, Marker Interface, Math Class, Media Tracker, Memory Leak in Java, Memory Management in Java, Menu Class, Message Digest, Method Chaining, Method Overloading, Method Overriding, Methods in Java, MIDI Devices in Java, Mouse Adapter Class, Mouse Event, Mouse Listener Interface, Multi-Catch Exception, Multi-Level Inheritance, Multicast Socket, Multidimensional Arrays, Mutable Objects in Java, Naming Convention in Java, Native Methods, Navigable Map, Navigable Set, Nested Classes in Java, Network Interface Class, NoClassDefFoundError, NoSuchFieldException, NoSuchMethodException, Non-Blocking IO (NIO), Null Pointer Exception, Number Class, Number Format Exception, NumberFormat Class, Object Class, Object Cloning, Object Input Stream, Object Oriented Programming, Object Output Stream, Object Serialization in Java, Observer Pattern, Observable Class, OpenGL in Java, Optional Class, OutOfMemoryError, Override Annotation, Package Declaration, Packages in Java, Paint Interface, Panel Class, Parallel Garbage Collector, Parameter Passing in Java, ParseException, Path Interface, Pattern Class, Piped Input Stream, Piped Output Stream, PixelGrabber Class, Point Class, Polymorphism in Java, Prepared Statement, Primitive Data Types in Java, PrintStream Class, PrintWriter Class, Priority Blocking Queue, Priority Queue Class, Private Access Modifier, Process Class, Process Builder Class, Progress Monitor Class, Properties Class, Protected Access Modifier, Proxy Class, Public Access Modifier, Queue Interface, RadioButton Class, Random Access File, Reader Class, ReadWriteLock Interface, Rectangle Class, Recursive Methods, Reflection API in Java, Reference Queue, Regular Expressions in Java, Remote Method Invocation (RMI), Render Quality, Repeatable Annotations, Resource Bundle Class, Resource Leak in Java, ResultSet Interface, ResultSetMetaData Interface, Retry Logic in Java, Return Statement in Java, Runnable Interface, Runtime Class, Runtime Error, Runtime Exception, Runtime Permissions, Runtime Polymorphism, Scanner Class, Scheduling in Java, Script Engine, Scroll Bar Component, Scroll Pane Component, Security Exception, Security Manager, Semaphore Class, Sequence Input Stream, Serializable Interface, ServerSocket Class, Service Loader, Set Interface, Setter Methods, Shared Memory in Java, Short Class, Single Inheritance, Singleton Pattern in Java, Socket Class, SocketTimeoutException, Sorted Map, Sorted Set, Splash Screen, Spring Framework, SQLException, SSL Socket, Stack Class, StackOverflowError, Standard Edition of Java, StandardOpenOption, Statement Interface, StreamTokenizer Class, Strictfp Keyword, String Buffer Class, String Builder Class, String Class, String Constant Pool, StringIndexOutOfBoundsException, String Interning, String Literal in Java, String Pool in Java, String Tokenizer Class, Strong Typing in Java, Structural Patterns, Stub Class, Subclasses in Java, Superclass in Java, Supplier Interface, Support Classes, Swing Components, Swing Timer, Switch Statement in Java, Synchronized Block, Synchronized Method, System Class, System Properties in Java, Tab Pane Component, Table Model Interface, TCP Connection in Java, Template Method Pattern, Text Area Component, Text Field Component, Text Listener Interface, Thread Class, Thread Group, Thread Interruption, Thread Local Class, Thread Priority, Thread Safety in Java, Thread Scheduling, Throwable Class, Time Zone Class, Timer Class, Timer Task Class, Toolkit Class, ToolTip Manager, Transferable Interface, Transient Keyword, Tree Map Class, Tree Set Class, Try With Resources Statement, Type Erasure in Java, Type Inference in Java, Type Parameters, UI Manager Class, Unary Operator Interface, Unchecked Exceptions, UndeclaredThrowableException, Unicode Support in Java, Unmodifiable Collection, Unsafe Class, URL Class, URLConnection Class, URLDecoder Class, URLEncoder Class, URLStreamHandler Class, URLClassLoader Class, User Interface Components, Varargs in Java, Variable Arguments, Variable Scope in Java, Vector Class, Vendor-Specific Extensions, Viewport Class, Virtual Machine in Java, Volatile Keyword, Wait and Notify Methods, Weak Hash Map, Weak Reference, While Loop in Java, Wildcard Generic Types, Window Adapter Class, Window Event, Window Listener Interface, Wrapper Classes in Java, Write Once Run Anywhere, XML Binding in Java, XML Parsing in Java, XML Schema in Java, XPath Expression in Java, XSLT Transformation in Java, Yield Method in Thread, Zip Entry, Zip File, Zip Input Stream, Zip Output Stream, ZoneId Class, ZoneOffset Class

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