如何隐藏当前的JPanel并使用Java中的按钮显示一个新的JPanel？

如何隐藏当前的JPanel并使用Java中的按钮显示一个新的JPanel？

从容器中取出组件后，它进入该

invalidate

状态。把它带回来给

valid

你要的状态

revalidate

和

repaint

那个。在您的情况下，您将直接从中添加/删除组件，

Jframe

具体取决于Java版本，您可以这样做：

frame.revalidate(); // For Java 1.7 or aboveframe.getContentPane().validate(); // For Java 1.6 or belowframe.repaint();

这是一个可以帮助您的工作示例：

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Assignment{    private Jframe frame;    private JPanel firstPanel;    private JPanel secondPanel;    private JButton forwardButton;    private JButton backButton;    private void displayGUI()    {        frame = new Jframe("Assignment");        frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);        firstPanel = new JPanel();        firstPanel.setOpaque(true);        firstPanel.setBackground(Color.BLUE);        secondPanel = new JPanel();        secondPanel.setOpaque(true);        secondPanel.setBackground(Color.RED);        forwardButton = new JButton("Forward");        forwardButton.addActionListener(new ActionListener()        { @Override public void actionPerformed(ActionEvent ae) {     frame.remove(firstPanel);     frame.add(secondPanel);     frame.revalidate(); // For Java 1.7 or above.     // frame.getContentPane().validate(); // For Java 1.6 or below.     frame.repaint(); }        });        backButton = new JButton("Back");        backButton.addActionListener(new ActionListener()        { @Override public void actionPerformed(ActionEvent ae) {     frame.remove(secondPanel);     frame.add(firstPanel);     frame.revalidate(); // For Java 1.7 or above.     // frame.getContentPane().validate(); // For Java 1.6 or below.     frame.repaint(); }        });        firstPanel.add(forwardButton);        secondPanel.add(backButton);        frame.add(firstPanel);        frame.setSize(300, 300);        frame.setLocationByPlatform(true);        frame.setVisible(true);    }    public static void main(String... args)    {        SwingUtilities.invokeLater(new Runnable()        { @Override public void run() {     new Assignment().displayGUI(); }        });    }}