Question

This is what I need to do

Ability to reverse the contents of a single dimensional array of variable size, without using another temporary array.

Given a single dimensional array of integers, numbers, write the Java code to reverse the contents of numbers in-place without using a temporary array to store the reversed contents.
For example, if numbers is {12, 34, 50, 67, 88}, provide code that will alter numbers so that its contents now become {88, 67, 50, 34, 12}.

This is what I have
it is not working correctly.

public static int[] reverseArrayWithoutTempArray(int[] array) {

        double array [ ];

        array = new double [10];
        int [ ] num = {12, 34, 50, 67, 88};
        int i = 0;
        int  j = a.length - 1;
        for (i = 0; i < a.length / 2; i++, j—){
            int temp = a[i];
            a[i] = a[j];
            a[j] = temp;
          }
        return array;
    }

Answer 1

It actually is working correctly for the example you provided. This is how my code looks like:

    public static int[] reverseArrayWithoutTempArray(int[] a) {
    int i = 0;
    int  j = a.length - 1;
    for (i = 0; i < a.length / 2; i++, j--){
        int temp = a[i];
        a[i] = a[j];
        a[j] = temp;
      }
    return a;
}