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);

    }

}