java:使用匿名类直接new接口

1 package contract;
2 
3 public interface ISay {
4     void sayHello();
5 }

 1 package jimmy;
 2 import contract.ISay;
 3 public class Program {
 4     public static void main(String[] args) {
 5         ISay say = new ISay() {          
 6             public void sayHello() {
 7                 System.out.println("Hello java!");
 8             }
 9         };
10     }
11 }

 1 package jimmy;
 2 
 3 import contract.ISay;
 4 import java.io.PrintStream;
 5 
 6 class Program$1
 7   implements ISay
 8 {
 9   public void sayHello()
10   {
11     System.out.println("Hello java!");
12   }
13 }