Web Reference: Sep 10, 2025 · In this comprehensive tutorial, you will learn about Java’s List methods add() and addAll(), their performance characteristics, best practices, and modern usage patterns. Jan 2, 2019 · This method appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's iterator. Syntax: Parameters: This function has a single parameter, i.e, Collection c, whose elements are to be appended to the list. Jan 16, 2026 · This can significantly simplify the code when you need to combine multiple collections, making your code more concise and efficient. In this blog, we will explore the fundamental concepts, usage methods, common practices, and best practices of the `addAll ()` method in Java.
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