在主窗口中切换JPanel

我有一个应用程序允许用户选择一个选项，并根据用户选择从组件中删除JPanel，添加新的JPanel并重新validation组件

看代码：

if (c != null) { contentPane.remove(c); } c = new AddBookInterface(theLibrary); contentPane.add(c); contentPane.revalidate(); break; 

c是一个组件

我有几个JPanels，用户可以切换，交换机正常工作。 但是，当我在用户选择时添加此JPanel时，之后添加的JPanel无法正确加载。 是什么造成的？

  public class RemoveBookInterface extends JPanel { private Library theLibrary; public RemoveBookInterface(Library theLibrary) { this.theLibrary = theLibrary; setSize(400, 400); setLayout(new BorderLayout()); setVisible(true); removeBook(theLibrary); } public void removeBook(Library theLibrary) { // prompt user for book id of book to remove Long ID = Long .parseLong(JOptionPane .showInputDialog("Enter the library book ID for the book you want to remove")); try { // get library book info and store it to display in message LibraryBook lb = theLibrary.getInventory().findLibraryBook(ID); // remove book theLibrary.removeBook(ID); // display message indicating book was removed JOptionPane .showMessageDialog( null, "The following library book was removed:\n" + lb.toString()); } catch (Exception e1) { JOptionPane.showMessageDialog(null, e1.getMessage()); } } 

}

Answer 1

更好的方法是转移到CardLayout。 但如果你想坚持你的方法，那么尝试在你的线后添加

 if (c != null) { contentPane.remove(c); } c = new AddBookInterface(theLibrary); contentPane.add(c); contentPane.revalidate(); contentPane.repaint(); frame.validate(); frame.repaint(); break; 

或者您可能忘记为事件调度程序线程安排作业。 帮助您的事业的示例程序：

 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 code 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(); } }); } } 

希望在某些方面可能会有所帮助。

问候。