The use of the Java direct new interface

The anonymous class in Java has a magical usage, as shown in the following code example:

1 package contract;2 3 public interface Isay {4 void SayHello (); 5}

Above is a simple interface, below is how to use:

  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 } 

At first glance, as if in "without providing interface implementation, a direct new interface instance", for C#er, there is a bright to destroy the three views.

Fortunately this is just an illusion, observing the class output in the bin directory, you will find a similar program1.CLassof thetextpieces,asFruitAnti-compilationtranslationViewObserveaunder,HairnowOriginalcome tois acompilationtranslationDevicefromMovingHealthintoaaclassP Rog Ram1:

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 () Ten {one System.out.println ("Hello java!" ); 12} 13}

If there are situations where you just need to create an implementation class for an interface temporarily, the "tricks" above can be used to simplify the code.

Java: Using anonymous class direct new interface

The use of the Java direct new interface