Java设计模式的事件模型详解

public class EventObject implements java.io.Serializable {
    /**
     * 事件源
     */
    protected transient Object source;
    public EventObject(Object source) {
        if (source == null)
            throw new IllegalArgumentException("null source");
        this.source = source;
    }
    public Object getSource() {
        return source;
    }
    public String toString() {
        return getClass().getName() + "[source=" + source + "]";
    }
}

package java.util;
public interface EventListener {
}

public class EventObject implements java.io.Serializable {
    /**
     * 事件源
     */
    protected transient Object source;
    public EventObject(Object source) {
        if (source == null)
            throw new IllegalArgumentException("null source");
        this.source = source;
    }
    public Object getSource() {
        return source;
    }
    public String toString() {
        return getClass().getName() + "[source=" + source + "]";
    }
}

import java.util.EventObject;
public class Event extends EventObject {
    public Event(Object source) {
        super(source);
    }
}

import java.util.HashSet;
import java.util.Set;
public class Source {
    private String name;
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    private final Set<Listener> listenerSet = new HashSet<>();
    public void registerEventListener(Listener eventListener) {
        if (eventListener != null) {
            listenerSet.add(eventListener);
        }
    }
    public void handle() {
        for (Listener eventListener : listenerSet) {
            Event event = new Event(this);
            eventListener.callback(event);
        }
    }
}

import java.util.EventListener;
public interface Listener extends EventListener {
    void callback(Event e);
}

public class Test {
    public static void main(String[] args) {
        Source source = new Source();
        source.setName("鼠标点击");
        System.out.println(source.getName());
        source.registerEventListener((event) -> {//这里是处理逻辑
            System.out.println("鼠标事件回调被执行了---");
            System.out.println("当前线程名称："+Thread.currentThread().getName());
        });
        source.handle();
    }
}