java笔记 ActionListener

按钮 文本框 菜单项 密码框 单选按钮 触发ActionEvent事件

//Inner class 事件处理例一
import java.awt.*;
import java.awt.event.*;
import java.net.PortUnreachableException;
import javax.swing.*;

class myButtonFrame extends Frame
{
    
    
    Button btn;

    myButtonFrame(String s)
    {
    
    
        // 设置窗口
        setTitle(s);
        setSize(400, 400);

        // 创建按钮
        btn = new Button("Pick Me");
        add(btn);

        // 创立监听
        ButtonListener bt = new ButtonListener();
        ButtonListener1 bt1 = new ButtonListener1();
        ButtonListener2 bt2 = new ButtonListener2();


        // 绑定事件
        btn.addActionListener(bt);
        btn.addActionListener(bt1);
        btn.addActionListener(bt2);

        //setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    private class ButtonListener implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)  // 重写接口里面的函数
        {
    
    
            System.out.println("why me？");
        }
    }

    private class ButtonListener1 implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)
        {
    
    
            System.out.println("don't pick me anymore!");
        }
    }

    private class ButtonListener2 implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)
        {
    
    
            System.out.println("sb");
        }
    }
}


//主类
public class test
{
    
    
    public static void main(String args[])
    {
    
    
        myButtonFrame frm = new myButtonFrame("ActionEventTest");
    }
}

1.先创建组件
2.建立监听器 ButtonListener bt = new ButtonListener();
3.将监听器添加到组件中 btn.addActionListener(bt);
4.实现监听器接口，实现actionPerformed函数中要传入参数ActionEvent e

private class ButtonListener2 implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)  // 传入参数
        {
    
    
            System.out.println("sb");
        }
    }

---

如果是Frame，输出是绑定时间的顺序

如果是JFrame，就是倒着的顺序

//Inner class 事件处理例一
import java.awt.*;
import java.awt.event.*;
import java.net.PortUnreachableException;
import javax.swing.*;

class myButtonFrame extends JFrame
{
    
    
    JButton btn;

    myButtonFrame(String s)
    {
    
    
        // 设置窗口
        setTitle(s);
        setSize(400, 400);

        // 创建按钮
        btn = new JButton("Pick Me");
        add(btn);

        // 创立监听
        ButtonListener bt = new ButtonListener();
        ButtonListener1 bt1 = new ButtonListener1();
        ButtonListener2 bt2 = new ButtonListener2();


        // 绑定事件
        btn.addActionListener(bt);
        btn.addActionListener(bt1);
        btn.addActionListener(bt2);

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    private class ButtonListener implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)  // 重写接口里面的函数
        {
    
    
            System.out.println("why me？");
        }
    }

    private class ButtonListener1 implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)
        {
    
    
            System.out.println("don't pick me anymore!");
        }
    }

    private class ButtonListener2 implements ActionListener
    {
    
    
        public void actionPerformed(ActionEvent e)
        {
    
    
            System.out.println("sb");
        }
    }
}


//主类
public class test
{
    
    
    public static void main(String args[])
    {
    
    
        myButtonFrame frm = new myButtonFrame("ActionEventTest");
    }
}