

接口类:ihelloworld.java public interface ihelloworld { string sayhelloworld(); }
实现类一:helloworld1.java public class helloworld1 implements ihelloworld { public helloworld1() { super(); } public string sayhelloworld() { return "hello world helloworld1"; } } 实现类二:helloworld2.java public class helloworld2 implements ihelloworld { public helloworld2() { super(); } public string sayhelloworld() { return "hello world helloworld2"; } } 在接口类ihelloworld.java的方法sayhelloworld()上面右键,在弹出的菜单中选择open implementation,如下图所示: 






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