java经典算法之逆序输出

Posted 2020-12-31 zhangningning

 1 /**
 2   *输入字符，将数组逆序输出
 3   */
 4 import java.util.Scanner;
 5 public class InReserve  
 6 {
 7     public static void main(String[] args) 
 8     {
 9         reverse();
10     }
11     public static void reverse(){
12 
13         String[] arr =new String[5];
14         for(int i=0;i<arr.length;i++){
15             Scanner input = new Scanner(System.in);
16             System.out.println("请输入第"+(i+1)+"个字符");
17             arr[i] = input.next();
18         }
19 
20         for(int p=0,q=arr.length-1;p<q;p++,q--){
21             String temp = "";    //声明临时变量，存储arr[p]
22             temp = arr[p];
23             arr[p] = arr[q];
24             arr[q] = temp;        //
25         }
26         toString(arr);    //        调用toString()方法输出数组
27     }
28 
29     public static void toString(String[] arr){
30         String str = "[";
31         for(int i=0;i<arr.length;i++){
32             str += arr[i];
33             if(i<arr.length-1){
34                 str += ",";
35             }
36         }
37         str += "]";
38         System.out.println(str);
39      }
40 }