So, internal implementation of both array and ArrayList is almost the same. Because, it automatically resizes itself if you try to add elements beyond its capacity.ĪrrayList internally uses an array to store its elements. ArrayList is also called as dynamic array or re-sizable array. You can’t change its size once it is created. Differences Between Array And ArrayList In Java :Īrray is static in nature i.e its length is fixed. Let’s discuss the differences between Array Vs ArrayList in Java in detail. ArrayList automatically resizes itself when you add elements more than its capacity. To overcome this drawback of array, ArrayList is introduced in Java. Because, array is a fixed length data structure. You can describe ArrayList as an advanced version of Array. ArrayList is a class in Java Collection Framework which is introduced from JDK 1.2. Array is a basic data structure which is the part of Java from the beginning. Array and ArrayList are two important and most used data structures in Java.
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