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An integer array of size three, after which we set values to indexes 0 and 2. Example: ArrayList pList new ArrayList( ) ArrayList and HashMap are commonly used data structures in programming. This section covers algorithms related to sorting.ArrayLists are slightly slower than arrays This matters only in large numerical applications ArrayList class has many methods that provide functionality beyond what arrays provide You can declare an ArrayList as containing objects of a particular type.

Here are some advantages of using ArrayList over arrays.1) You can define ArrayList as re-sizable array. Instead of arrays, you can use ArrayList class which addresses all these drawbacks. Memory is allocated to an array during it’s creation only, much before the actual elements are added to it.Because of these drawbacks, use of arrays are less preferred.