面试题8

package com.maoge;

import java.util.Arrays;

public class  {
    public static void main(String args[]) {
        int arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
        System.out.println(Arrays.toString(arr));
        reversal(arr);
        System.out.println(Arrays.toString(arr));
    }

    public static void reversal(int[] arr) {
        int len = arr.length;
        for (int i = 0; i < len / 2; i++) {
            int temp = arr[i];
            arr[i] = arr[len - 1 - i];
            arr[len - 1 - i] = temp;
        }
    }
}