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“This book is a Desktop Java reference, designed to sit faithfully by your keyboard while you program. Part I is a fast-paced, “no-fluff” introduction to the Java programming language and the core runtime aspects of the Java platform. Part II is a reference section that blends elucidation of core concepts with examples of important core APIs. The book covers Java 11, but we recognize that some shops may not have adopted it yet — so where possible we call out if a feature was introduced in Java 8, Java 9, or Java 10. We use Java 11 syntax throughout, including var and lambda expressions.