直接上菜

/*接口类*/

public interface MsgListener{

	public void afterMsgRecived(String msgData);

}

/*工具类*/

public class Tools{

	public static void getMsgData(String reciver,MsgListener listener){

		reciver+=reciver;

		//关键的来了

		listener.afterMsgRecived(reciver);

	}

}

//调用

public static void main(String[] args){

	String reciver="JACK THE REAPER";

	//调用

	Tools.getMsgData(reciver,new MsgListener(){

		@override

		public void afterMsgRecived(String msgData){

			System.out.println(msgData);

		}

	});

}

最后。yes,yes,你会看到控制台输出:"JACK THE REAPERJACK THE REAPER";