JFrame删除JPanel并添加新的JPanel

Question

我当然有一个发送HTTP请求的SwingWorker,我重写了SwingWorker的done()方法来改变JFrame中的内容.我想基本上删除所有内容并在JFrame上添加一个新的成员面板,具体取决于从服务器返回的值.

现在,我面临的问题是,当我在JFrame上调用以下方法时,它不会从JFrame中删除任何内容,也不会更改Frame中包含的内容.

//TODO: Investigate why JFrame content pane won't repaint.
f.removeAll();
//Pass the frame f reference only into MainDisplay, it doesn't actually do anything apart from allowing a class to add a JMenuBar on the JFrame.
f.add(new MainDisplay(f)); 
f.getContentPane().invalidate();
f.getContentPane().validate();
f.getContentPane().repaint();

我目前的修复方法如下所示,但我宁愿更改JFrame的内容,而不是加载新的内容.

f.dispose();
f=new ApplicationFrame();

我在这里和谷歌上看过以前的答案,有些州使用validate()或invalidate()同时调用repaint()来重绘JFrame.

任何建议/帮助将不胜感激.

编辑:我想我会调试更多,因为一定有其他问题.

Answer 1

例如

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MyFrame extends JFrame {

    private static final long serialVersionUID = 1L;

    public MyFrame() {
        final JPanel parentPanel = new JPanel();
        parentPanel.setLayout(new BorderLayout(10, 10));

        final JPanel childPanel1 = new JPanel();
        childPanel1.setBackground(Color.red);
        childPanel1.setPreferredSize(new Dimension(300, 40));

        final JPanel childPanel2 = new JPanel();
        childPanel2.setBackground(Color.blue);
        childPanel2.setPreferredSize(new Dimension(800, 600));

        JButton myButton = new JButton("Add Component ");
        myButton.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                parentPanel.remove(childPanel1);
                parentPanel.add(childPanel2, BorderLayout.CENTER);
                parentPanel.revalidate();
                parentPanel.repaint();
                pack();
            }
        });
        setTitle("My Empty Frame");
        setLocation(10, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        parentPanel.add(childPanel1, BorderLayout.CENTER);
        parentPanel.add(myButton, BorderLayout.SOUTH);
        add(parentPanel);
        pack();
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                MyFrame myFrame = new MyFrame();
            }
        });
    }
}