java学习p167

import java.util.Scanner;
public class a1 {
    public static void main(String[] args) {
         Scanner myScanner = new Scanner(System.in);
         System.out.println("请输入数组的长度");
         int length = myScanner.nextInt();
         int[] arr = new int[length];
         System.out.println("请输入数组元素的值");
         for (int i = 0; i < arr.length; i++) {
             arr[i] = myScanner.nextInt();
         }
         System.out.print("此时数组为 ");
         for (int i = 0; i < arr.length; i++) {
             System.out.print(arr[i] + " ");
         }
         System.out.println();
         int temp;
         for (int i = 0; i < arr.length / 2; i++) {
             temp = arr[i];
             arr[i] = arr[arr.length - 1 - i];
             arr[arr.length - 1 - i] = temp;
         }
         System.out.print("翻转后的数组为 ");
         for (int i = 0; i < arr.length; i++) {
             System.out.print(arr[i] + " ");
         }
    }
}