Question

首先，我想说，就我的java知识而言，我是一个初学者。所以，我正在开发一个applet，使用Card Layout可以有不同的页面。我设法从在线资源中收集了一些代码，但是，我正在努力完成一些事情。我会把它分成几个问题。

如何使按钮按下时，用户将被带到指定的卡而不是下一张卡？
在“主要”课程中，如何设置我想要的卡片的可见性，而不是列表中的第一张？
在页面类（Menu，FirstPage等）中，如何只使用一种按钮处理方法而不必重复相同的代码？
如果我在其中有绘画方法，我的页面类是否会起作用？
如何将此应用程序转换为applet？目前它是JFrame。

如果有人能帮助我，我真的很感激。

主要课程

 public class Main
{
    private Menu menu;
    private FirstPage page1;
    private SecondPage page2;
    private ThirdPage page3;
    private FourthPage page4;

    private void showGUI()
    {
        JFrame frame = new JFrame();
        JPanel contentPane = new JPanel();
        contentPane.setLayout(new CardLayout());
        contentPane.setPreferredSize(new Dimension(240,600));

        menu = new Menu(contentPane);
        page1 = new FirstPage(contentPane);
        page2 = new SecondPage(contentPane);
        page3 = new ThirdPage(contentPane);
        page4 = new FourthPage(contentPane);

        contentPane.add(menu, "Menu"); 
        contentPane.add(page1, "First page");
        contentPane.add(page2, "Second page");
        contentPane.add(page3, "Third page");
        contentPane.add(page4, "Fourth page");

        frame.setContentPane(contentPane);      
        frame.pack();   
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new Main().showGUI();
            }
        });
    }
}

菜单页面类

class Menu extends javax.swing.JPanel 
{
    private javax.swing.JLabel textLabel;
    private JPanel contentPane;
    private JButton pageOne;
    private JButton pageTwo;
    private JButton pageThree;
    private JButton pageFour;

    public Menu(JPanel cp) 
    {
        this.contentPane = cp;
          initComponents();
    }

    private void initComponents() 
    {
        setBackground(Color.WHITE);
        setLayout(null);

        textLabel = new JLabel("This is the menu page", JLabel.CENTER);
        textLabel.setForeground(Color.BLACK);

        pageOne = new JButton("Flowers");
        pageTwo = new JButton("Trees");
        pageThree = new JButton("Rivers");
        pageFour = new JButton("Seas");


        pageOne.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageOneAction(ae); } });
        pageTwo.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageTwoAction(ae); } });
        pageThree.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageThreeAction(ae); } });
        pageFour.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageFourAction(ae); } });
        textLabel.setBounds(20, 20, 200, 60);

        pageOne.setBounds(20, 100, 200, 60);
        pageTwo.setBounds(20, 170, 200, 60);
        pageThree.setBounds(20, 240, 200, 60);
        pageFour.setBounds(20, 310, 200, 60);

        add(pageOne);
        add(pageTwo);
        add(pageThree);
        add(pageFour);
        add(textLabel);
    }                   

    private void pageOneAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
    private void pageTwoAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
    private void pageThreeAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
    private void pageFourAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
}

第一页课

class FirstPage extends javax.swing.JPanel 
{
    private javax.swing.JLabel textLabel;
    private JPanel contentPane;
    private JButton menu;
    private JButton pageTwo;
    private JButton pageThree;
    private JButton pageFour;

    public FirstPage(JPanel cp) 
    {
        this.contentPane = cp;
        this.setSize(500, 500);
        initComponents();
    }

    private void initComponents() 
    {
        setBackground(Color.WHITE);
        setLayout(null);

        textLabel = new JLabel("This is the flowers page", JLabel.CENTER);
        textLabel.setForeground(Color.BLACK);

        menu = new JButton("Back to Menu");
        pageTwo = new JButton("Trees");
        pageThree = new JButton("Rivers");
        pageFour = new JButton("Seas");


        menu.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { menuAction(ae); } });
        pageTwo.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageTwoAction(ae); } });
        pageThree.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageThreeAction(ae); } });
        pageFour.addActionListener(new ActionListener(){ @Override  public void actionPerformed(ActionEvent ae) { pageFourAction(ae); } });

        textLabel.setBounds(20, 20, 200, 60);
        menu.setBounds(20, 100, 200, 60);
        pageTwo.setBounds(20, 170, 200, 60);
        pageThree.setBounds(20, 240, 200, 60);
        pageFour.setBounds(20, 310, 200, 60);

        add(menu);
        add(pageTwo);
        add(pageThree);
        add(pageFour);
        add(textLabel);
    }                   

    private void menuAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
    private void pageTwoAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
    private void pageThreeAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
    private void pageFourAction(ActionEvent ae)
    {
        CardLayout layout = (CardLayout)contentPane.getLayout();
        layout.next(contentPane); 
    }
}

其他页面与上面的页面相同。

浏览带有卡片布局的小程序（需要一些指导和代码修复）

0 个答案: