按钮点击事件的窗口程序

package _5_19;

import javax.swing.*;

import java.awt.event.*;

 

public class QFrame extends JFrame {

public QFrame() {

JButton jbtNew = new JButton("New");

JPanel panel = new JPanel();

panel.add(jbtNew);

add(panel);

jbtNew.addActionListener(new ActionListener() {

// Create a new class and register the event listener for the new button

public void actionPerformed(ActionEvent e) {

JOptionPane.showMessageDialog(null, "Clicked the new button");

System.out.println("Process new");

}

});

}

 

public static void main(String[] args) {

JFrame frame = new QFrame();

frame.setTitle("QFrame");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationRelativeTo(null);

frame.pack();

frame.setVisible(true);

}

}