Java:如何删除 JPanel 屏幕

Question

所以，我正在创建一个排序菜单，并且我有一个登录屏幕。当用户登录时，它会加载另一个菜单。我让它加载了第二个菜单，但我不知道如何删除登录按钮和文本字段等。我该怎么做呢？

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

public class Main extends  JFrame{

    public void fixtureList()   //Here is where all of the fixture/timetable elements are based.
    {
        JButton editButton;
        JButton createButton;
        JButton logoutButton;

        editButton = new JButton("Edit");
        editButton.setBounds(10, 10, 80, 30);
        add(editButton);

        createButton = new JButton(("Create"));
        createButton.setBounds(145, 10, 80, 30);
        add(createButton);

        logoutButton = new JButton(("Log Out"));
        logoutButton.setBounds(10, 350, 80, 30);
        add(logoutButton);
        logoutButton.addActionListener(new ActionListener()
        {

            public void actionPerformed(ActionEvent e)
            {
                //Execute when button is pressed
                loginPanel();
                System.out.println("Loading the login screen");
                repaint();
            }

        });

    }

    public void loginPanel()    //This is where the screen containing all of the login elements is based.
    {
        setLayout(null);

        JButton loginButton;
        JTextField usernameField;
        JPasswordField passwordField;


        loginButton = new JButton("Login");
        loginButton.setBounds(80, 250, 70, 30);
        add(loginButton);
        usernameField = new JTextField(15);
        usernameField.setBounds(60, 110, 130, 30);
        add(usernameField);
        passwordField = new JPasswordField(15);
        passwordField.setBounds(60, 150, 130, 30);
        add(passwordField);


        loginButton.addActionListener(new ActionListener()
        {

            public void actionPerformed(ActionEvent e)
            {
                //Execute when button is pressed
                fixtureList();
                System.out.println("Loading the fixtures screen");
                repaint();
            }

        });

    }

    public static void main(String[] args)
    {

        Main window = new Main();

        window.setTitle("PE Fixtures v1.0");
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setSize(250, 430);
        window.loginPanel();
        window.setResizable(false);
        window.getContentPane().setBackground(new Color(53, 56, 64));
        window.setVisible(true);



    }
}
            });

Answer 1

I tried CardLayout earlier and wasn't too happy with it.

我敦促您重新访问 CardLayout , 描述 here和插图here .它专为您描述的效果而设计。

为了帮助理解，比较这个更原始的approach删除组件并使用 revalidate() 将组件标记为需要重新布局。