汽车购买计划 - 需要用JButton计算最终价格

时间：2015-02-16 15:22:07

标签： java swing jframe jbutton actionlistener

我为每个汽车购买选项设置了值，但是当我点击按钮时，我一直得到0.我宣布后，我无法获得fP更新。这是我的代码：

public class CarOptions extends JFrame {

    //All the Buttons needed
    private JComboBox colorOptions;
    private JRadioButton leatherInt;
    private JRadioButton touchScreen;
    private JRadioButton premiumSound;
    private JRadioButton bodyKit;

    //Car prices
    int cP = 1000;
    int eng1 = 6000;
    int eng2 = 8000;
    int eng3 = 12000;
    int acc1 = 600;
    int acc2 = 800;
    int acc3 = 3000;
    int acc4 = 1200;
    int fP;

    public CarOptions(){                
        createControlPanel();
    }
    public void createControlPanel(){
    //Panel for all the options
        JPanel colorOptions1 = createComboBox();
        JPanel sportsOptions = createCheckBoxes();
        JPanel accOptions = createRadioButtons();
        JPanel finalPrice1 = createButton();

        //Line up the panels
        JPanel controlPanel = new JPanel();
        controlPanel.setLayout(new GridLayout(4,1));
        controlPanel.add(colorOptions1);
        controlPanel.add(sportsOptions);
        controlPanel.add(accOptions);
        controlPanel.add(finalPrice1);

        add(controlPanel, BorderLayout.SOUTH);
    }
    public JPanel createComboBox(){

        colorOptions = new JComboBox();
        colorOptions.addItem("Black");
        colorOptions.addItem("Yellow");
        colorOptions.addItem("Blue");
        colorOptions.addItem("Red");

        JPanel panel = new JPanel();
        panel.add(colorOptions);
        return panel;
    }
    public JPanel createCheckBoxes(){
        ButtonGroup group = new ButtonGroup();
        AbstractButton hybrid = new JCheckBox("Hybrid");
        AbstractButton base = new JCheckBox("Base Model");
        AbstractButton sport = new JCheckBox("Sport");
        group.add(hybrid);
        group.add(base);
        group.add(sport);

        if (hybrid.isSelected()){
            fP = fP + eng1;
        }
        else if (base.isSelected()){
            fP = fP + eng2;
        }
        else if (sport.isSelected()){
            fP = fP + eng3;
        }

        JPanel panel = new JPanel();
        panel.add(hybrid);
        panel.add(base);
        panel.add(sport);
        panel.setBorder(new TitledBorder(new EtchedBorder(), "Engine Package"));
        return panel;
    }
    public JPanel createRadioButtons(){
        leatherInt = new JRadioButton("Leather Interior");
        touchScreen = new JRadioButton("Touchscreen Radio");
        premiumSound = new JRadioButton("Premium Sound System");
        bodyKit = new JRadioButton("Body Kit");

        if (leatherInt.isSelected()){
            fP = cP + acc1;
        }
        else if (touchScreen.isSelected()){
            fP = cP + acc2;
        }
        else if  (premiumSound.isSelected()){
            fP = cP + acc3;
        }        
        else if (bodyKit.isSelected()){
            fP = cP + acc4;
        }

        JPanel panel = new JPanel();
        panel.add(leatherInt);
        panel.add(touchScreen);
        panel.add(premiumSound);
        panel.add(bodyKit);
        panel.setBorder(new TitledBorder(new EtchedBorder(), "Accesories"));
        return panel;
    }
    public JPanel createButton(){
       JButton finalPrice = new JButton("Final Price");
       finalPrice.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e){

               JFrame fPFrame = new JFrame();
               fPFrame.setSize(200,100);
               fPFrame.setTitle("Final Price");
               fPFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
               fPFrame.setVisible(true);

               JLabel fPLabel = new JLabel("Your final price is: $" + fP);
               JPanel fPPanel = new JPanel();
               fPPanel.add(fPLabel);
               fPFrame.add(fPPanel);
           }
       });

       JPanel panel = new JPanel();
       panel.add(finalPrice);
       return panel;
    }
}

2 个答案:

答案 0 :(得分：1)

你得0，因为没有计算价格＆＃34;点击按钮＆＃34;。

您正在尝试在创建按钮时计算价格。问题是用户还没有做任何事情。价格只能根据事件计算。

因此，您需要将所有价格计算代码移至ActionListener

答案 1 :(得分：1)

您只根据空控件进行了一次计算。这是一个修复：

//All the Buttons needed
private JComboBox<String> colorOptions;
private JRadioButton leatherInt;
private JRadioButton touchScreen;
private JRadioButton premiumSound;
private JRadioButton bodyKit;

//Car prices
int cP = 1000;
int eng1 = 6000;
int eng2 = 8000;
int eng3 = 12000;
int acc1 = 600;
int acc2 = 800;
int acc3 = 3000;
int acc4 = 1200;
int fP;

public CarOptions(){                
    createControlPanel();
}
public void createControlPanel(){
//Panel for all the options
    JPanel colorOptions1 = createComboBox();
    JPanel sportsOptions = createCheckBoxes();
    JPanel accOptions = createRadioButtons();
    JPanel finalPrice1 = createButton();

    //Line up the panels
    JPanel controlPanel = new JPanel();
    controlPanel.setLayout(new GridLayout(4,1));
    controlPanel.add(colorOptions1);
    controlPanel.add(sportsOptions);
    controlPanel.add(accOptions);
    controlPanel.add(finalPrice1);

    add(controlPanel, BorderLayout.SOUTH);
}
public JPanel createComboBox(){

    colorOptions = new JComboBox<>();
    colorOptions.addItem("Black");
    colorOptions.addItem("Yellow");
    colorOptions.addItem("Blue");
    colorOptions.addItem("Red");

    JPanel panel = new JPanel();
    panel.add(colorOptions);
    return panel;
}
public JPanel createCheckBoxes(){
    ButtonGroup group = new ButtonGroup();
    AbstractButton hybrid = new JCheckBox("Hybrid");
    AbstractButton base = new JCheckBox("Base Model");
    AbstractButton sport = new JCheckBox("Sport");
    group.add(hybrid);
    group.add(base);
    group.add(sport);

    if (hybrid.isSelected()){
        fP = fP + eng1;
    }
    else if (base.isSelected()){
        fP = fP + eng2;
    }
    else if (sport.isSelected()){
        fP = fP + eng3;
    }

    JPanel panel = new JPanel();
    panel.add(hybrid);
    panel.add(base);
    panel.add(sport);
    panel.setBorder(new TitledBorder(new EtchedBorder(), "Engine Package"));
    return panel;
}
public JPanel createRadioButtons(){
    leatherInt = new JRadioButton("Leather Interior");
    touchScreen = new JRadioButton("Touchscreen Radio");
    premiumSound = new JRadioButton("Premium Sound System");
    bodyKit = new JRadioButton("Body Kit");

    recalculate();
    JPanel panel = new JPanel();
    panel.add(leatherInt);
    panel.add(touchScreen);
    panel.add(premiumSound);
    panel.add(bodyKit);
    panel.setBorder(new TitledBorder(new EtchedBorder(), "Accesories"));
    return panel;
}
public JPanel createButton(){
   JButton finalPrice = new JButton("Final Price");
   finalPrice.addActionListener(new ActionListener(){
       public void actionPerformed(ActionEvent e){
           recalculate();
           JFrame fPFrame = new JFrame();
           fPFrame.setSize(200,100);
           fPFrame.setTitle("Final Price");
           fPFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
           fPFrame.setVisible(true);

           JLabel fPLabel = new JLabel("Your final price is: $" + fP);
           JPanel fPPanel = new JPanel();
           fPPanel.add(fPLabel);
           fPFrame.add(fPPanel);
       }
   });

   JPanel panel = new JPanel();
   panel.add(finalPrice);
   return panel;
}

private void recalculate() {
       if (leatherInt.isSelected()){
            fP = cP + acc1;
        }
        else if (touchScreen.isSelected()){
            fP = cP + acc2;
        }
        else if  (premiumSound.isSelected()){
            fP = cP + acc3;
        }        
        else if (bodyKit.isSelected()){
            fP = cP + acc4;
        }
}
相关问题
最新问题