Web Reference: Java ArrayList An ArrayList is like a resizable array. It is part of the java.util package and implements the List interface. The difference between a built-in array and an ArrayList in Java, is that the size of an array cannot be modified (if you want to add or remove elements to/from an array, you have to create a new one). Mar 14, 2026 · The add () method in Java ArrayList is used to insert elements into the list dynamically. It allows adding elements either at the end of the list or at a specific index position. As elements are added to an ArrayList, its capacity grows automatically. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost.
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