Reversing an Array in Java [duplicate]

Answer 1

In case you don't want to use a temporary variable, you can also do like this:

final int len = arr.length;
for (int i=0; i < (len/2); i++) {
    arr[i] += arr[len - 1 - i]; //  a = a+b
    arr[len - 1 - i] = arr[i] - arr[len - 1 - i];   //  b = a-b
    arr[i] -= arr[len - 1 - i]; //  a = a-b
}