更好的方法是转向CardLayout。但是如果您想坚持自己的方法，请尝试在行后添加
if (c != null) { contentPane.remove(c); } c = new AddBookInterface(theLibrary); contentPane.add(c); contentPane.revalidate(); contentPane.repaint(); frame.validate(); frame.repaint(); break;否则您可能忘记了为事件调度程序线程安排作业。一个示例程序可以帮助您实现目标：
import java.awt.event.*;import javax.swing.*;public class TwoPanelTest implements ActionListener{ private Jframe frame; private JPanel panel1; private JPanel panel2; private JButton button1; private JButton button2; private JLabel label1; private JLabel label2; private JTextField tfield1; private JTextField tfield2; public TwoPanelTest() { frame = new Jframe(); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); panel1 = new JPanel(); panel2 = new JPanel(); label1 = new JLabel("This is Label 1"); label2 = new JLabel("This is Label 2"); button1 = new JButton("BUTTON 1"); button2 = new JButton("BUTTON 2"); button1.addActionListener(this); button2.addActionListener(this); tfield1 = new JTextField(20); tfield2 = new JTextField(20); panel1.add(label1); panel1.add(button1); panel1.add(tfield1); panel2.add(label2); panel2.add(button2); panel2.add(tfield2); tfield1.setText("MY TEXT WILL CHANGE."); frame.setContentPane(panel1); frame.pack(); frame.setVisible(true); } public void actionPerformed(ActionEvent ae) { JButton button = (JButton)ae.getSource(); if (button == button1) { frame.remove(panel1); frame.setContentPane(panel2); tfield2.setText("TEXTFIELD 2"); frame.validate(); frame.repaint(); } else if (button == button2) { frame.remove(panel2); frame.setContentPane(panel1); tfield1.setText("TEXTFIELD 1"); frame.validate(); frame.repaint(); } } public static void main(String[] args) { // Here Event Dispatcher thread is responsible for // calling the function which creates and displays your GUI // or it itself contains the pre for creating and displaying // the GUI, to remove hickups experienced while updating the // GUI on the run. SwingUtilities.invokeLater(new Runnable() { public void run() { new TwoPanelTest(); } }); }}希望这会有所帮助。
问候。
