Java ??? ????? ???, ??? ?? ? ??? ???? ? ???? ?????.

1. ???

???? ????? ??? ?? ??? ??? ?? ??? ????? java.util.EventObject ????? ?????.

import java.util.EventObject;  
  
/** 
 * 事件類,用于封裝事件源及一些與事件相關(guān)的參數(shù). 
 */  
public class CusEvent extends EventObject {  
    private static final long serialVersionUID = 1L;  
    private Object source;//事件源  
      
    public CusEvent(Object source){  
        super(source);  
        this.source = source;  
    }  
  
    public Object getSource() {  
        return source;  
    }  
  
    public void setSource(Object source) {  
        this.source = source;  
    }  
}

2. ??? ??

??? ??? ??? ??? ???? ?? ??(?: BUTTON ??, TEXTBOX ? ?? ?)?? ?? ?????. .) ????. ?, ?? ??? ??? ?????. ??? ???? ??? ??? ????? ??? ??? ?? ????? ???? ??? ????(List, Set ?)? ??? ???.

/** 
 * 事件源.  
 */  
public class EventSourceObject {  
    private String name;  
    //監(jiān)聽器容器  
    private Set<CusEventListener> listener;  
    public EventSourceObject(){  
        this.listener = new HashSet<CusEventListener>();  
        this.name = "defaultname";  
    }  
    //給事件源注冊監(jiān)聽器  
    public void addCusListener(CusEventListener cel){  
        this.listener.add(cel);  
    }  
    //當事件發(fā)生時,通知注冊在該事件源上的所有監(jiān)聽器做出相應(yīng)的反應(yīng)（調(diào)用回調(diào)方法）  
    protected void notifies(){  
        CusEventListener cel = null;  
        Iterator<CusEventListener> iterator = this.listener.iterator();  
        while(iterator.hasNext()){  
            cel = iterator.next();  
            cel.fireCusEvent(new CusEvent(this));  
        }  
    }  
    public String getName() {  
        return name;  
    }  
    //模擬事件觸發(fā)器，當成員變量name的值發(fā)生變化時，觸發(fā)事件。  
    public void setName(String name) {  
        if(!this.name.equals(name)){  
            this.name = name;  
            notifies();  
        }        
    }  
}

3. ??? ???

??? ???? java.util.EventListener ?????? ???? ??? ??? ????, ??? ??? ???? ??? ???? ?? ???? ???? ?? ?????. ???? ?????.

import java.util.EventListener;  
  
/** 
 * 事件監(jiān)聽器，實現(xiàn)java.util.EventListener接口。定義回調(diào)方法，將你想要做的事 
 * 放到這個方法下,因為事件源發(fā)生相應(yīng)的事件時會調(diào)用這個方法。 
 */  
public class CusEventListener implements EventListener {  
      
    //事件發(fā)生后的回調(diào)方法  
    public void fireCusEvent(CusEvent e){  
        EventSourceObjecteObject = (EventSourceObject)e.getSource();  
        System.out.println("My name has been changed!");  
        System.out.println("I got a new name,named \""+eObject.getName()+"\"");
    }  
}

??? ???

public class MainTest {  
   
    public static void main(String[] args) {  
        EventSourceObject object = new EventSourceObject();  
        //注冊監(jiān)聽器  
        object.addCusListener(new CusEventListener(){  
            @Override  
            public void fireCusEvent(CusEvent e) {  
                super.fireCusEvent(e);  
            }  
        });  
        //觸發(fā)事件  
        object.setName("AiLu");  
    }  
}

4. ???, ??? ?? ? ??? ?? ??

??? ??-----??---->???------> ; ??? ???------>??? ?? ?? ??

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class DemoAction extends Frame {//窗口就是事件源
    public DemoAction() {
        this.setTitle("窗口關(guān)閉");
        this.setLocation(400, 200);
        this.setSize(360, 280);   
        //給窗口綁定一個事件監(jiān)聽器
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {//事件WindowEvent
                System.exit(0);//關(guān)閉窗口事件, 那么退出jvm
            }
        });
        this.setVisible(true);
    }
 
    public static void main(String[] args) {
        new DemoAction();
    }
}

5. ??? ??? ?? ??:

(1) ??? ??

(2) ??? ?? ? ??

(3) ???? ??? ?????? ???? ???? ????? ??? ??? ?????.

(4) ???? ?? ???? ???? ???? ?????.

?? ?:

public class LoginListener implements ActionListener{
String text;
public void actionPerformed(ActionEvent e){
if("willow".equals(text)){
system.out.println("登錄成功！\n");
}
}
}
public class Login(){
public void showFrame(){
//創(chuàng)建窗體
JFrame LFrame = new JFrame();
LFrame.setSize(1000,800);
LFrame.setLocationRelativeTo(null);
LFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
LFrame.setLayout(new FlowLayout());
//創(chuàng)建監(jiān)聽器對象
LoginListener lg = new LoginListener();
//給窗體添加按鈕組件
JTextField tf = new JTextField();
LFrame.add(tf);
//給輸入框添加監(jiān)聽器
tf.addActionLisener(lg);
tf.text=tf.getText();
}
};

?? java ?? ???, ?? PHP ??? ????? ????. ??? ??? ?? ?? ?????!

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