swing中的按钮事件

package pack2;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

public class num_2v extends JFrame implements ActionListener{

JButton jb;

public num_2v(){

jb = new JButton("确定");

jb.addActionListener(this);

this.add(jb);

this.setSize(300,300);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

public static void main(String[] args) {

new num_2v();

}

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

System.out.println("点击了按钮");

}

}