

接口類:ihelloworld.java public interface ihelloworld {  string sayhelloworld(); } 
 實現類一:helloworld1.java public class helloworld1 implements ihelloworld {  public helloworld1()  {   super();  }  public string sayhelloworld()  {   return "hello world helloworld1";  } } 實現類二:helloworld2.java public class helloworld2 implements ihelloworld {  public helloworld2()  {   super();  }  public string sayhelloworld()  {   return "hello world helloworld2";  } }   在接口類ihelloworld.java的方法sayhelloworld()上面右鍵,在彈出的菜單中選擇open implementation,如下圖所示: 






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