1 public class Test1 {
2 public static void main(String[] args) {
3 //定义一个4位数的数组
4 int[] arr = new int[4];
5 //键盘录入数字
6 Scanner scanner = new Scanner(System.in);
7 System.out.println("请输入4位数字:");
8 int number = scanner.nextInt();
9 arr[0] = number/1000%10;
10 arr[1] = number/100%10;
11 arr[2] = number/10%10;
12 arr[3] = number%10;
13
14 //数组反转
15 reverse(arr);
16
17 //打印数组
18 printArray(arr);
19
20 }
21
22 public static void reverse(int[] arr) {
23 for(int start=0,end=arr.length-1;start<end;start++,end--) {
24 int temp = arr[start];
25 arr[start] = arr[end];
26 arr[end] = temp;
27 }
28 }
29
30 public static void printArray(int[] arr) {
31 for(int i=0;i<arr.length;i++) {
32 System.out.print(arr[i]);
33 }
34 }
35 }
