consider that we want to define an array of integers.
we have two options:
1: Integer[] a=new Integer[5];
2:int[] a=new int[5]
so we can always use the first one because it is a class and it has useful methods.
so why should we use the second one?
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What "useful methods" does `Integer` have? – Elliott Frisch Feb 27 '18 at 18:42
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Wrapper classes have unnecessary overhead, so use them only when you have to; for example in `Arrays.asList(anIntegerArray)`. – DodgyCodeException Feb 27 '18 at 18:45