Java按鈕問題

Question

我想讓用戶輸入2個字段。一個是游泳池的體積，一個是小屋的體積。這然後計算每個的價格，如果用戶輸入池的容量，那麼我遇到的麻煩是，然後他們不能爲熱水浴缸輸入任何東西，反之亦然。這是我迄今爲止所擁有的。我是否需要爲此設置2個獨立的字段，或者如何完成？

非常多的字符串errors =「」;可以刪除，一旦我找出如何只讓他們輸入一組數字。這裏是計算部分，代碼的另一部分只是3個標籤。

pricePanel = new JPanel(new FlowLayout()); 

     final JRadioButton poolPrice= new JRadioButton("Pool"); 
     final JRadioButton tubPrice = new JRadioButton("Hot Tub"); 

     poolPrice.setSelected(true); 

     ButtonGroup group = new ButtonGroup(); 
     group.add(poolPrice); 
     group.add(tubPrice); 

     pricePanel.add(poolPrice); 
     pricePanel.add(tubPrice); 

     pricePanel.add(new JLabel("Enter the pool's volume: ")); 
     final JTextField poolField = new JTextField(10); 
     pricePanel.add(poolField); 

     pricePanel.add(new JLabel("Enter the tub's volume: ")); 
     final JTextField tubField = new JTextField(10); 
     pricePanel.add(tubField); 


     JButton calculatePrice = new JButton("Calculate Price"); 
     calculatePrice.setMnemonic('C'); 
     pricePanel.add(calculatePrice); 
     pricePanel.add(createExitButton()); 

     pricePanel.add(new JLabel("The price is:$ ")); 
     final JTextField priceField = new JTextField(10); 
     priceField.setEditable(false); 
     pricePanel.add(priceField); 


     calculatePrice.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 

        double pool = Double.parseDouble (poolField.getText()); 
        double tub = Double.parseDouble(tubField.getText()); 

        double price; 
        if (poolPrice.isSelected()) { 
         price = pool * 100; 
        } else { 
         price = tub * 75; 
        } 
        priceField.setText(df.format(price)); 
       } 
     }); 
    }; 


     ActionListener priceListener = new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       if (e.getSource() == poolPrice) { 
        tubLabel.setEnabled(false); 
        tubField.setEnabled(false); 
        messageArea.setVisible(true); 
       } else if (e.getSource() == tubPrice) { 
        poolLabel.setEnabled(false); 
        poolField.setEnabled(false); 
        messageArea.setVisible(true); 
       } 
      } 
     }; 


     poolPrice.addActionListener(priceListener); 
     tubPrice.addActionListener(priceListener); 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

hotTubsPanel = new JPanel(new FlowLayout()); 

    final JRadioButton roundTub = new JRadioButton("Round Tub"); 
    final JRadioButton ovalTub = new JRadioButton("Oval Tub"); 

    roundTub.setSelected(true); 

    ButtonGroup group = new ButtonGroup(); 
    group.add(roundTub); 
    group.add(ovalTub); 

    hotTubsPanel.add(roundTub); 
    hotTubsPanel.add(ovalTub); 

    hotTubsPanel.add(new JLabel("Enter the tub's length:  ")); 
    final JTextField lengthField = new JTextField(10); 
    hotTubsPanel.add(lengthField); 

    final JLabel widthLabel = new JLabel("Enter the tub's width*: "); 
    widthLabel.setEnabled(false); 
    hotTubsPanel.add(widthLabel); 

    final JTextField widthField = new JTextField(10); 
    widthField.setEnabled(false); 
    hotTubsPanel.add(widthField); 

    hotTubsPanel.add(new JLabel("Enter the tub's depth: ")); 
    final JTextField depthField = new JTextField(10); 
    hotTubsPanel.add(depthField); 

    JButton calculateVolume = new JButton("Calculate Volume"); 
    calculateVolume.setMnemonic('C'); 
    hotTubsPanel.add(calculateVolume); 
    hotTubsPanel.add(createExitButton()); 

    hotTubsPanel.add(new JLabel("The tub's volume is: ")); 
    final JTextField volumeField = new JTextField(10); 
    volumeField.setEditable(false); 
    hotTubsPanel.add(volumeField); 

    final JTextArea messageArea = createMessageArea(1, 25, 
      "*Width will be set to the same value as length"); 
    hotTubsPanel.add(messageArea); 

    calculateVolume.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent e) { 
      if (roundTub.isSelected()) { 
       widthField.setText(lengthField.getText()); 
      } 

      ValidationResult result = validateFields(new JTextField[] { 
        lengthField, widthField, depthField }); 

      String errors = ""; 
      if (result.filled != 3) { 
       errors += "Please fill out all fields! "; 
      } 
      if (result.valid != 3 && result.filled != result.valid) { 
       errors += "Please enter valid numbers!"; 
      } 

      if (errors != "") { 
       messageArea.setText(errors); 
       messageArea.setVisible(true); 
      } else { 
       messageArea.setVisible(false); 

       double length = Double.parseDouble(lengthField.getText()); 
       double width = Double.parseDouble(widthField.getText()); 
       double depth = Double.parseDouble(depthField.getText()); 

       double volume; 
       if (roundTub.isSelected()) { 
        volume = Math.PI * Math.pow(length/2.0, 2) * depth; 
       } else { 
        volume = Math.PI * Math.pow(length * width, 2) * depth; 
       } 
       volumeField.setText(df.format(volume)); 
      } 
     } 
    }); 

    ActionListener tubsListener = new ActionListener() { 
     public void actionPerformed(ActionEvent e) { 
      if (e.getSource() == roundTub) { 
       widthLabel.setEnabled(false); 
       widthField.setEnabled(false); 
       widthField.setText(lengthField.getText()); 
       messageArea.setText("Tub's width set to length"); 
       messageArea.setVisible(true); 
      } else if (e.getSource() == ovalTub) { 
       widthLabel.setEnabled(true); 
       widthField.setEnabled(true); 
       messageArea.setVisible(false); 
      } 
     } 
    }; 
    roundTub.addActionListener(tubsListener); 
    ovalTub.addActionListener(tubsListener); 
} 

Answer 1

兩個文本字段，只有一個結果字段可能會讓用戶感到困惑。如果只有一個結果字段，那麼只應該有一個文本字段。 Stian建議的單選按鈕可以工作，或者甚至有兩個按鈕，一個用於游泳池，一個用於熱水浴缸（這隻需要一次點擊即可獲得其他價格）。您還應該在結果字段中顯示某項已計算的內容，如「池價格：$ XX.XX」或「熱銷價格：$ XX.XX」。如果您按下按鈕的想法並標記按鈕「Pool」和「Hot Tub」，您甚至可以對結果進行一些處理，例如setText(e.getActionCommand()+" price:"+price);。

另外，if (errors != "")總是會是true。您正在測試您的errors對象是否與您正在創建的新對象相同;它永遠不會。您應該測試if (!errors.equals(""))或if (errors.length()!=0)。