如何用另一个 JPanel 替换 JPanel [英] How to replace JPanel with another JPanel

问题描述

我想用 JFrame 中的另一个 Jpanel 替换一个 Jpanel我已经搜索并尝试了我的代码，但没有任何反应这是我的代码:

I want to replace a Jpanel with another one in a JFrame I already search and try my code but nothing's happen this is my code :

public class Frame extends JFrame {

    private Container contain;
    private JPanel reChange,reChange2;
    private JButton reChangeButton;

    public Frame() {
        super("Change a panel");
        setSize(350, 350);
        setLayout(null);
        setLocationRelativeTo(null);
        setResizable(false);

        reChange = new JPanel(null);
        reChange.setBackground(Color.red);
        reChange.setSize(240, 225);
        reChange.setBounds(50, 50, 240, 225);
        add(reChange);

        reChangeButton = new JButton("Change It");
        reChangeButton.setBounds(20, 20, 100, 20);
        add(reChangeButton);

        reChangeButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                //System.out.println("in");
                contain = getContentPane();
                contain.removeAll();
                //System.out.println("in2");

                reChange2 = new JPanel(null);
                reChange2.setBackground(Color.white);
                reChange2.setSize(240, 225);
                reChange2.setBounds(50, 50, 240, 225);
                //System.out.println("in3");

                contain.add(reChange2);
                validate();
                //System.out.println("in4");
                setVisible(true);
                //System.out.println("in5");
            }
        });

    }

    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

有人可以帮助我吗?非常感谢

can someone help me ? Thanks a lot

推荐答案

1. 不要使用AbsoluteLayout

将 actionPerformed 中的 validate(); 更改为 contain.validate(); 并跟随 contain.repaint();

change validate(); in actionPerformed to contain.validate(); and follows with contain.repaint();

将类名(保留的 Java 字或方法名)Frame (java.awt.Frame) 重命名为 MyFrame (例如)

rename class name (reserved Java word, or methods name) Frame (java.awt.Frame) to MyFrame (for example)

使用 CardLayout 而不是 remove 然后在运行时添加一个新的 JPanel

use CardLayout instead of remove and then add a new JPanel on runtime

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