Java利用CardLayout布局管理器完成界面设计，添加三个命令按钮Jbutton，初始显示“第一张卡片”，当单击按钮时显示下一卡片，如下图所示。

好的，我会尽力回答。首先，我们可以使用以下代码实现此界面设计：

import java.awt.CardLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class CardLayoutExample extends JFrame implements ActionListener {
    private CardLayout cardLayout;
    private JPanel cardPanel;
    private JButton card1Button, card2Button, card3Button;

    public CardLayoutExample() {
        cardLayout = new CardLayout();
        cardPanel = new JPanel(cardLayout);

        // 创建三个面板，每个面板显示不同的卡片
        JPanel card1 = new JPanel();
        card1.add(new JButton("第一张卡片"));

        JPanel card2 = new JPanel();
        card2.add(new JButton("第二张卡片"));

        JPanel card3 = new JPanel();
        card3.add(new JButton("第三张卡片"));

        // 将三个面板添加到卡片面板中
        cardPanel.add(card1, "Card 1");
        cardPanel.add(card2, "Card 2");
        cardPanel.add(card3, "Card 3");

        // 创建三个按钮，用于切换卡片
        card1Button = new JButton("卡片1");
        card1Button.addActionListener(this);

        card2Button = new JButton("卡片2");
        card2Button.addActionListener(this);

        card3Button = new JButton("卡片3");
        card3Button.addActionListener(this);

        // 将按钮添加到主界面中
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(card1Button);
        buttonPanel.add(card2Button);
        buttonPanel.add(card3Button);

        // 将卡片面板和按钮面板添加到主界面中
        add(cardPanel);
        add(buttonPanel, "South");

        setTitle("CardLayout Example");
        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == card1Button) {
            cardLayout.show(cardPanel, "Card 1");
        } else if (e.getSource() == card2Button) {
            cardLayout.show(cardPanel, "Card 2");
        } else if (e.getSource() == card3Button) {
            cardLayout.show(cardPanel, "Card 3");
        }
    }

    public static void main(String[] args) {
        new CardLayoutExample();
    }
}

运行此代码将显示一个带有三个按钮的窗口，单击按钮将切换卡片。希望这可以帮助到您！