就是在主窗体里按了退出按钮；切换到自定义panel上，在这panel里按了确定，退出后直接切换的登入界面。setVisible这时只能控制这个panel！
------解决方案--------------------
这样不能符合你的要求么
- Java code
import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Test{ public static void main(String[] args) { MFrame frame = new MFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }}class MFrame extends JFrame{ public static final int Default_Width = 300; public static final int Default_Height = 300; private CardLayout card; private Container con; MFrame() { setTitle("test"); setSize(Default_Width, Default_Height); card = new CardLayout(); con = getContentPane(); con.setLayout(card); FirstPanel fPanel = new FirstPanel(); SecondPanel sPanel = new SecondPanel(); con.add(fPanel, "first"); con.add(sPanel, "second"); } class FirstPanel extends JPanel { public FirstPanel() { setLayout(new FlowLayout()); JButton button = new JButton("登录"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { card.show(con, "second"); } }); JLabel label = new JLabel("登录界面"); add(label); add(button); } } class SecondPanel extends JPanel { public SecondPanel() { setLayout(new BorderLayout()); setBackground(Color.RED); JLabel label = new JLabel("WELCOME", JLabel.CENTER); JButton button = new JButton("QUIT"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { card.show(con, "first"); } }); add(label, BorderLayout.CENTER); add(button, BorderLayout.SOUTH); } }}