/* package whatever; // don't place package name! */import java.util.*;import java.lang.*;import java.io.*;/* Name of the class has to be "Main" only if the class is public. */class Ideone{    public static void main (String[] args) throws java.lang.Exception    {        int[] a = {1,2,4,5};        System.out.println( Arrays.toString(reverseArray(a)));    }        public static int[] reverseArray(int[] nums){        int begin = 0;        int end = nums.length -1;        while(begin < end){            swap(nums, begin++, end--);        }        return nums;    }        private static int[] swap(int[] nums, int begin, int end){        int temp = nums[begin];        nums[begin] = nums[end];        nums[end] = temp;        return nums;    }}