(5)Swing事件

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class From extends JFrame {
    private JPanel jPanel;
    private JButton button1;

    From() {
        init();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("From");
        frame.setContentPane(new From().jPanel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setSize(600, 500);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void init() {
        ButtonClickListener buttonClickListener =new ButtonClickListener();
        button1 = new JButton("连接");
        jPanel.add(button1);
        button1.addActionListener(buttonClickListener);
    }

}

class ButtonClickListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        JOptionPane.showMessageDialog(null, "连接成功", "提示", JOptionPane.INFORMATION_MESSAGE);
    }
}