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List backed by Integer array versus int array differencr

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Hi, i have the below piece of code for swapping.

Now when i use List backed by Integer array like below

It works fine and gives output as [2,1]

but i use List backed by int array like below

throws ArrayIndexOutOfBounds exception. Little help please
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Have you posted the offending code exactly as it was run? Because what you wrote won't throw any exceptions. What you wanted to write, viz swap(Arrays.asList(ar1), 1, 0); will however throw an exception. If you look through the Arrays class, you will find the asList() method, but you won't find any overloadings for it. It takes T... as a parameter and ints cannot be a T. If you pass an Integer[], the method can take Integer as its T, but if you pass an int[] or any other array of primitives, it can only take int[] or similar as its type. So you create a List<int[]]> with one element.
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