ArrayList stores homogeneous(mean same type like int or float or char etc) data as well as hetrogeneous(different type of data like int, string char all together) data. Array provides O(1) performance for get(index) method but remove is costly in ArrayList as you need to rearrange all elements. The ArrayList class is a resizable array, which can be found in the java.util package.
Array stores homogeneous(mean same type like int or float or char etc) data.ĪrrayList is similar to variable only thing is that it can hold more than one value at time.
But array can contain both primitives and objects in Java. We cannot store primitives in ArrayList, it can only store objects. We cannot change length of array once created in Java but ArrayList can be changed. An ArrayList does not require you to specify how big. Array is a fixed length data structure whereas ArrayList is a variable length Collection class. The most important difference between Array and ArrayList is given below ParameterĪrray is similar to variable only thing is that it can hold more than one value at time. A plain array requires the use of s to specify a dimension for the array.
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