1 import java.io.PrintStream;
 2 
 3 /*
 4  * 
 5  * public class ValueTransferTest4
 6  *{
 7  *    public static void main(String[] args)
 8  * {
 9  *         int a =10;
10  *         int b =10;
11           
12          method(a,b);  // 在不改变原题情况下，调用method  输出a=100 b = 100
13          
14          System.out.println(a);
15          System.out.println(b);
16          
17     }
18  * 
19  */
20 public class ValueTransferTest4
21 {
22     public static void main(String[] args)
23     {
24          int a =10;
25          int b =10;
26          
27          method(a,b);  //
28          
29          System.out.println("a = "+a);
30          System.out.println("b = "+b);
31          
32     }
33     
34     //方式一
35 //    public  static void method(int a,int b)
36 //    {
37 //        a = a*10;
38 //        b = b*10;
39 //        System.out.println(a);
40 //        System.out.println(b);
41 //        System.exit(0);
42 //       
43 //        
44 //    }
45     
46     //方式二
47     public  static void method(int a,int b)
48     {
49         PrintStream ps = new PrintStream(System.out)
50                 {
51                     @Override
52                     public void println(String x)
53                     {
54                         if("a = 10".equals(x))
55                         {
56                             x ="a = 100";
57                         
58                         }
59                         else if("b = 10".equals(x))    
60                             {
61                                 x = "b = 200";
62                             }
63                             super.println(x);
64                         
65                     }
66                     
67                 };
68                 System.setOut(ps);
69                 
70             
71     }
72