reverse array java

 

/* 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;
    }
}