EventListener

package com.test.event.listener;
 
import java.util.EventListener;
 
public interface NotifyListener extends EventListener {
    String notify(String message);
}

package com.test.event.listener;
 
public class ProcData {
    private NotifyListener listener;
 
    public void addListener(NotifyListener notifyListener) {
        this.listener = notifyListener;
    }
 
    public void send() {
        for (int i = 0; i < 10; i++) {
              String message=  listener.notify("open the door");
              System.out.println(message);
 
 
        }
    }
 
 
}

package com.test.event.listener;
 
public class ProcessRepeatData {
    public static void test() {
        ProcData importData = new ProcData();
        importData.addListener(new NotifyListener() {
            @Override
            public String notify(String message) {
                System.out.println("====== result: " + message);
                return "notify";
            }
        });
 
        importData.send();
    }
 
    public static void main(String args[]) {
        test();
    }
}