接上2

 1 package cn.lovefat.demo03;
 2 
 3 
 4 import java.util.Scanner;
 5 
 6 public class Test_4 {
 7     public static void main(String[] args) {
 8         String s = input();
 9         System.out.println(s);
10         String a= convert(s);
11         System.out.println(a);
12     }
13     public static String convert(String str){
14         StringBuilder s = new StringBuilder();
15         for(int i=0;i<str.length();i++){
16             
17             char c= str.charAt(i);
18             if(c>=‘a‘&&c<=‘z‘){
19                 c= (char)(c-32);
20             }
21             else if(c>=‘A‘&&c<=‘Z‘){
22                 c=(char)(c+32);
23             }
24             else{
25                 c=‘*‘;
26             }
27             s = s.append(c);
28         }
29         return s.toString();
30     }
31     public static String input(){
32         StringBuffer buffer = new StringBuffer();
33         System.out.println("请输入Hello12345World");
34         Scanner s = new Scanner(System.in);
35         while(true){
36             String str = s.next();
37             if(str.endsWith("end")){
38                 System.out.println("over");
39                 break;
40             }    
41             else{
42                 buffer = buffer.append(str);
43                 }
44         }
45         return buffer.toString();
46         
47     }
48 
49 }