The below example declares an ArrayList of length 3 and initializes its items. There're no ways for adding an additional item as the capacity's fixedĪrrayList, backed by an array, auto grow its capacity internally, you can add more elements than the initial The following example declares an array of length 3 and assigns value to the allocated item. Once an array object is created, its length/capacity never changes, you can't add more elements than the initial capacity Let's walk through this tutorial to see the differences between Array and ArrayList in Java in detail examples Fixed vs dynamic size implementationĪn array is an object container that holds a fixed number of single type elements. Arrays in Java are fixed-size array data structure implementation, provide run-time type safetyĪrrayLists are resizable array implementation, a part of the Collections framework, offer compile-time type safety - through generics
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