java学习p168

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[] arr1 = new int[length];
         int[] arr2 = new int[length];
         System.out.println("请输入数组元素的值");
         for (int i = 0; i < length; i++) {
             arr1[i] = myScanner.nextInt();
         }
         System.out.print("此时数组为 ");
         for (int i = 0; i < length; i++) {
             System.out.print(arr1[i] + " ");
         }
         System.out.println();
         int count = 0;
         for (int i = length - 1; i >= 0; i--) {    //for (int i = length - 1, j = 0; i >= 0; i--, j++) {
             arr2[count] = arr1[i];                 //    arr2[j] = arr1[i];
             count++;                               //}
         }
         arr1 = arr2;
         System.out.print("翻转后的数组为 ");
         for (int i = 0; i < length; i++) {
             System.out.print(arr1[i] + " ");
         }
    }
}