框架内有 2 个 Jpanels。左侧面板是带有按钮的菜单。使用按钮切换右面板。答案

【问题标题】：2 Jpanels inside a frame. Left panel is menu with buttons. Use Buttons to switch Right Panel.框架内有 2 个 Jpanels。左侧面板是带有按钮的菜单。使用按钮切换右面板。
【发布时间】：2015-07-05 22:55:12
【问题描述】：

我正在尝试编写一个始终有 2 个面板的程序。左侧面板将是一个带有按钮的菜单，而右侧面板将根据任一面板中按下的按钮而改变。

现在我被卡住了。单击“recipeRolodexButton”时没有任何反应。我想要发生的是，右侧面板要么被我的面板方法删除并替换，要么被另一个面板覆盖。

public class Window extends JFrame implements ActionListener{


private static final long serialVersionUID = 1L;


//Buttons
        JButton recipeRolodexButton = new JButton("Recipe Rolodex");
        JButton groceryFinanceButton = new JButton("Grocery Finance");
        JButton testButton1 = new JButton("Test Button");

        JPanel homeLeftPanel = new JPanel();

        JPanel homeRightPanel = new JPanel();
        RolodexOptionsPane rop = new RolodexOptionsPane();

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

    public Window(){

    //declarations
    Toolkit tk = Toolkit.getDefaultToolkit();
    Dimension dim = new Dimension();        
    dim = tk.getScreenSize();
    GridBagConstraints gbcl = new GridBagConstraints();



    //setting up the window 
    this.setVisible(true);
    this.setSize(550,300);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.setTitle("Food Management");       
    int xPosition = ( (dim.width / 2) - this.getWidth() / 2);
    int yPosition = ( (dim.height / 2) - (this.getHeight() / 2));
    this.setLocation(xPosition, yPosition);
    this.setLayout(new GridBagLayout());
    this.setResizable(false);

        //Add Action Listeners
        recipeRolodexButton.addActionListener(this);;
        groceryFinanceButton.addActionListener(this);
        testButton1.addActionListener(this);

        //Setting up Main Panels
        homeLeftPanel.setBackground(Color.BLUE);
        homeLeftPanel.setLayout(new GridBagLayout());
        homeRightPanel.setBackground(Color.BLACK);
        homeRightPanel.setLayout(new GridBagLayout());

    // setting the Button constraints in the main Left Panel buttons 
    gbcl.anchor = GridBagConstraints.CENTER;
    gbcl.fill = GridBagConstraints.HORIZONTAL;
    gbcl.gridy = 0;
    gbcl.gridx = 0;             
    gbcl.ipady = 4;
    gbcl.insets = new Insets(15,0,0,0);
    homeLeftPanel.add(recipeRolodexButton,gbcl);                
    gbcl.gridy = 1;
    homeLeftPanel.add(groceryFinanceButton, gbcl);              
    gbcl.gridy = 2;
    homeLeftPanel.add(testButton1, gbcl);

    // setting up the buttons in the main right panel



    // EXECUTION!!!!!!!!!!!!
    PanelSet(homeLeftPanel,homeRightPanel);     

}

public void PanelSet(JPanel left , JPanel right){

    GridBagConstraints gbcLeft = new GridBagConstraints();
    GridBagConstraints gbcRight = new GridBagConstraints();

    //positioning the panels        
            gbcLeft.fill = GridBagConstraints.BOTH;
            gbcLeft.gridx = 0;
            gbcLeft.gridy = 0;
            gbcLeft.weightx = .15;
            gbcLeft.weighty = .5;               

            gbcRight.fill = GridBagConstraints.BOTH;
            gbcRight.gridx = 1;
            gbcRight.gridy = 0;
            gbcRight.weightx = .85;


this.add(left,gbcLeft);
this.add(right,gbcRight);
}


public void actionPerformed(ActionEvent e) {
    if(e.getSource() == recipeRolodexButton){
       PanelSet(recipeRolladexButton,rop);

    }

}



}

对间距感到抱歉。复制我的代码时，缩进丢失了。

【问题讨论】：

When copying my code over, the indentation was lost. - 修复你的代码。使用所有空格或所有制表符，但不要将两者混用。此外，方法名称不应以大写字符开头。不要称你为“Window”类。有一个同名的 AWT 类可能会引起混淆。选择一个更具描述性的名称。

标签： java swing jframe jpanel containers

【解决方案1】：

而右侧面板将根据任一面板中按下的按钮而改变。

您应该在右侧面板中使用Card Layout。然后，当您单击一个按钮时，您只需指定要显示的面板的名称，CardLayout 将完成其余的工作。

本教程有一个工作示例，展示了在从组合框中选择项目时如何交换面板。

【讨论】：