java - 不在 JFrame 中添加卡片布局

Question

有人能看到代码吗？我想制作一个具有横幅和面板的页面，其中卡片将根据要求进行更改。我在 JFrame 中添加了横幅(工作正常)，但问题是“CardLayout Panel 没有添加到 JFrame 中”。

Actually, I need this.

按下按钮时，只有卡 1 更改为卡 2，但横幅将保持不变。

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


public class gui extends JFrame{

    private static final long serialVersionUID = 1L;

    JPanel  
    basic_panel,
    card_Layout_panel,
    banner_panel,
    welcome_authenticaion_panel_card1;

    CardLayout basic2;

    JLabel 
    logo_label,
    name_label;


    public gui(){

        server_login_gui();
        add(basic_panel);
        standard_gui(); 
    }

    public void server_login_gui(){


        basic_panel = new JPanel();
        basic_panel.setLayout(null);
        basic_panel.setBorder(BorderFactory.createLineBorder(Color.BLUE, 2));

        banner_panel = new JPanel();
        banner_panel.setLayout(null);
        banner_panel.setBorder(BorderFactory.createLineBorder(Color.GREEN, 2));
        banner_panel.setSize(680, 200);//(400,100,400,100);


        //////Banner inner things//////////////////////////////////////////////////
        logo_label = new JLabel("Logo");
        logo_label.setBounds(30,40,100,100);
        logo_label.setBorder(BorderFactory.createLineBorder(Color.YELLOW, 2));
        banner_panel.add(logo_label);

        name_label = new JLabel("        Name.....   ");
        name_label.setFont(new Font("Times new Roman", Font.BOLD | Font.ITALIC,25));
        name_label.setBounds(200,80,400,50);
        name_label.setBorder(BorderFactory.createLineBorder(Color.YELLOW, 2));
        banner_panel.add(name_label);
        ////////////////////////////////////////////////////////////////////////        

//          basic_panel.add(banner_panel,BorderLayout.NORTH);


        ///////// Card Layout//////////////
        basic2 = new CardLayout();
        card_Layout_panel = new JPanel(basic2);
        card_Layout_panel.setBorder(BorderFactory.createLineBorder(Color.WHITE, 5));
        basic_panel.add(card_Layout_panel,BorderLayout.CENTER);

        welcome_authenticaion_panel_card1 = new JPanel();
        welcome_authenticaion_panel_card1.setLayout(null);
        welcome_authenticaion_panel_card1.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
        welcome_authenticaion_panel_card1.setSize(680, 200);//(400,100,400,100);
        welcome_authenticaion_panel_card1.setBounds(0,200,680,460);

        card_Layout_panel.add(welcome_authenticaion_panel_card1, "1");

        basic_panel.add(card_Layout_panel,BorderLayout.CENTER);


            /////////////////////////////////////////////////////////////////////////
    }

    public void standard_gui(){
        setSize(700,700);
        setTitle("System");
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
}

Answer 1

I want to make a page that has a banner and a pannel in which cards will change on the requirement.

1. 您的组件不可聚焦，需要一些事件(JButton、Swing Timer)来使用 CardLayout 切换 View

2. 有关 CardLayout to read Oracle tutorial 的更多信息，对于工作代码示例，这里有大量代码示例

3. 您的代码无需 NullLayout(通过将 BorderLayout 设置为父级 JPanel)即可工作，Jpanel 的默认 LayoutManager 为 FlowLayout(仅接受 getPreferredSize，子级不能随其父级调整大小)

4. 我的问题是为什么代码行 basic_panel.add(card_Layout_panel, BorderLayout.CENTER); 两次，另一个...

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class Gui extends JFrame {

    private static final long serialVersionUID = 1L;
    private JPanel basic_panel, card_Layout_panel,
            banner_panel, welcome_authenticaion_panel_card1;
    private CardLayout basic2;
    private JLabel logo_label, name_label;

    public Gui() {
        server_login_gui();
        add(basic_panel);
        standard_gui();
    }

    public void server_login_gui() {

        basic_panel = new JPanel();
        basic_panel.setLayout(new BorderLayout(10, 10));
        basic_panel.setBorder(BorderFactory.createLineBorder(Color.BLUE, 2));
        banner_panel = new JPanel();
        //banner_panel.setLayout(null);
        banner_panel.setBorder(BorderFactory.createLineBorder(Color.GREEN, 2));
        banner_panel.setSize(680, 200);//(400,100,400,100);
        //////Banner inner things//////////////////////////////////////////////////
        logo_label = new JLabel("Logo");
        //logo_label.setBounds(30, 40, 100, 100);
        logo_label.setBorder(BorderFactory.createLineBorder(Color.YELLOW, 2));
        banner_panel.add(logo_label);
        name_label = new JLabel("        Name.....   ");
        name_label.setFont(new Font("Times new Roman", Font.BOLD | Font.ITALIC, 25));
        //name_label.setBounds(200, 80, 400, 50);
        name_label.setBorder(BorderFactory.createLineBorder(Color.YELLOW, 2));
        banner_panel.add(name_label);
        ////////////////////////////////////////////////////////////////////////      
        basic_panel.add(banner_panel, BorderLayout.NORTH);
        ///////// Card Layout//////////////
        basic2 = new CardLayout();
        card_Layout_panel = new JPanel(basic2);
        card_Layout_panel.setBorder(BorderFactory.createLineBorder(Color.WHITE, 5));
        basic_panel.add(card_Layout_panel, BorderLayout.CENTER);
        welcome_authenticaion_panel_card1 = new JPanel();
        welcome_authenticaion_panel_card1.setLayout(null);
        welcome_authenticaion_panel_card1.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
        welcome_authenticaion_panel_card1.setSize(680, 200);//(400,100,400,100);
        //welcome_authenticaion_panel_card1.setBounds(0, 200, 680, 460);
        card_Layout_panel.add(welcome_authenticaion_panel_card1, "1");
        basic_panel.add(card_Layout_panel, BorderLayout.CENTER);
        /////////////////////////////////////////////////////////////////////////
    }

    public void standard_gui() {
        setSize(700, 700);
        setTitle("System");
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Gui();
            }
        });
    }
}