Java LinkedList.addFirst() is a method in the Java LinkedList class that adds an element to the front of the list. It is often used in Java applications where elements need to be processed in a first-in, first-out (FIFO) order or when implementing a queue. Introduced in Java 1997 with Java 1.2, addFirst() is a common method for managing lists where frequent additions to the front of the list are necessary.

https://docs.oracle.com/javase/8/docs/api/java/util/LinkedList.html