java添加事件監聽器_Java實作事件監聽器的四種方式

自身類作為事件監聽器:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class ThisClassEvent extends JFrame implements ActionListener{

JButton btn;

public ThisClassEvent(){

super("Java事件監聽機制");

setLayout(new FlowLayout());

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

btn=new JButton("點選");

btn.addActionListener(this);

getContentPane().add(btn);

setBounds(200,200,300,160);

setVisible(true);

}

public void actionPerformed (ActionEvent e){

Container c=getContentPane();

c.setBackground(Color.red);

}

public static void main(String args[]){

new ThisClassEvent();

}

}

外部類作為事件監聽器:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class OuterClassEvent extends JFrame{

JButton btn;

public OuterClassEvent(){

super("Java事件監聽機制");

setLayout(new FlowLayout());

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

btn=new JButton("點選");

btn.addActionListener(new OuterClass(this));

getContentPane().add(btn);

setBounds(200,200,300,160);

setVisible(true);

}

public static void main(String args[]){

new OuterClassEvent();

}

}

class OuterClass implements ActionListener{

OuterClassEvent oce;

public OuterClass(OuterClassEvent oce){

this.oce = oce;

}

public void actionPerformed(ActionEvent e){

Container c=oce.getContentPane();

c.setBackground(Color.red);

}

}

匿名内部類作為事件監聽器:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class AnonymousEvent extends JFrame{

JButton btn;

public AnonymousEvent(){

super("Java事件監聽機制");

setLayout(new FlowLayout());

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

btn=new JButton("點選");

btn.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent e){

Container c=getContentPane();

c.setBackground(Color.red);

}

}

);

getContentPane().add(btn);

setBounds(200,200,300,160);

setVisible(true);

}

public static void main(String args[]){

new AnonymousEvent();

}

}

内部類作為事件監聽器:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class InnerClassEvent extends JFrame{

JButton btn;

public InnerClassEvent(){

super("Java事件監聽機制");

setLayout(new FlowLayout());

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

btn=new JButton("點選");

btn.addActionListener(new InnerClass());

getContentPane().add(btn);

setBounds(200,200,300,160);

setVisible(true);

}

class InnerClass implements ActionListener{

public void actionPerformed (ActionEvent e){

Container c=getContentPane();

c.setBackground(Color.red);

}

}

public static void main(String args[]){

new InnerClassEvent();

}

}