JTextField在Mac上显示，但不在Windows上

Question

我的兄弟要求我制作一个简单的GUI应用程序，用于计算他在玩的游戏中的税收。所以我很快汇编了这个代码。我简直用了5分钟，我只是想让它迅速开展工作：在Java类MainApplication.java

public class MainGUI extends JFrame implements ActionListener { 

    private static final double EA_TAX = 0.05; 

    private JButton btnProfit; 
    private JTextField buyPrice; 
    private JTextField sellPrice; 
    private JTextField resultField; 
    private JLabel buyLabel; 
    private JLabel sellLabel; 
    private static final NumberFormat NUMBER_FORMAT = NumberFormat.getInstance(); 
    JPanel container; 

    public MainGUI(){ 
     this.setSize(400,400); 
     container = new JPanel(); 
     btnProfit = new JButton("Calculate"); 
     buyPrice = new JFormattedTextField(getIntFormatter(NUMBER_FORMAT)); 
     sellPrice = new JFormattedTextField(getIntFormatter(NUMBER_FORMAT)); 
     resultField = new JTextField(); 
     buyLabel = new JLabel("The price you intend to pay"); 
     sellLabel = new JLabel("Price you intend to sell the player for"); 
     resultField.setEditable(false); 
     btnProfit.addActionListener(this); 
     GridLayout gridLayout = new GridLayout(3,2); 
     container.setLayout(gridLayout); 
     container.add(buyLabel); 
     container.add(sellLabel); 
     container.add(buyPrice); 
     container.add(sellPrice); 
     container.add(btnProfit); 
     container.add(resultField); 

     container.setVisible(true); 
     this.add(container); 

     this.pack(); 
     this.setVisible(true); 
     this.setDefaultCloseOperation(EXIT_ON_CLOSE); 

    } 

    private NumberFormatter getIntFormatter(NumberFormat NUMBER_FORMAT) { 
     NumberFormatter formatter = new NumberFormatter(NUMBER_FORMAT); 
     formatter.setValueClass(Integer.class); 
     formatter.setMinimum(0); 
     formatter.setMaximum(Integer.MAX_VALUE); 
     //formatter.setAllowsInvalid(false); 
     formatter.setCommitsOnValidEdit(true); 


     return formatter; 
     } 


    @Override 
    public void actionPerformed(ActionEvent e) { 
     if(e.getSource() == this.btnProfit){ 
      this.resultField.setText("" +determineProfitAfterTax(Integer.parseInt(buyPrice.getText().replace(",", "")), Integer.parseInt(sellPrice.getText().replace(",", "")))); 
     } 
    } 

    private int determineProfitAfterTax(int buyPrice, int sellPrice){ 
     return (int) (sellPrice * (1.00 - EA_TAX)) - buyPrice; 
    } 
} 

我实例化JFrame：

public class MainApplication { 

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

所有文本字段的显示出来，除了resultFieldJTextField，这是持有结果的人。任何特定的原因，这在Mac上，而不是在Windows上工作？所有的输入是赞赏。

Answer 1

问题通过构建事件调度线程（由用户@trashgod强烈建议在GUI上Swing GUI的选项解决工作，澄清，而不是做这样的：

public class MainApplication { 

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

做到这一点：

public class MainApplication { 

    public static void main(String args[]){ 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       new MainGUI(); 
      } 
     }); 
    } 
} 

请始终尝试使用第二种方法，即使它可能看起来，你的程序使用第一种方式时，工作使用第一种方法。产生非常奇怪的副作用。

Answer 2

我修正了一些错误。现在，它在Windows.`

import javax.swing.*; 

    import javax.swing.text.NumberFormatter; 
    import java.awt.*; 
    import java.awt.event.ActionEvent; 
    import java.awt.event.ActionListener; 
    import java.text.NumberFormat; 

    public class MainGUI extends JFrame implements ActionListener { 

private static final double EA_TAX = 0.05; 

private JButton btnProfit; 
private JTextField buyPrice; 
private JTextField sellPrice; 
private JTextField resultField; 
private JLabel buyLabel; 
private JLabel sellLabel; 
private static final NumberFormat NUMBER_FORMAT =  NumberFormat.getInstance(); 
JPanel container; 

public MainGUI(){ 
    this.setSize(400,400); 
    container = new JPanel(); 
    btnProfit = new JButton("Calculate"); 
    buyPrice = new JFormattedTextField(getIntFormatter(NUMBER_FORMAT)); 
    sellPrice = new JFormattedTextField(getIntFormatter(NUMBER_FORMAT)); 
    resultField = new JTextField(); 
    buyLabel = new JLabel("The price you intend to pay"); 
    sellLabel = new JLabel("Price you intend to sell the player for"); 
    resultField.setEditable(false); 
    btnProfit.addActionListener(this); 
    GridLayout gridLayout = new GridLayout(3,2); 
    container.setLayout(gridLayout); 
    container.add(buyLabel); 
    container.add(sellLabel); 
    container.add(buyPrice); 
    container.add(sellPrice); 
    container.add(btnProfit); 
    container.add(resultField); 

    container.setVisible(true); 
    this.add(container); 

    this.pack(); 
    this.setVisible(true); 
    this.setDefaultCloseOperation(EXIT_ON_CLOSE); 

} 

private NumberFormatter getIntFormatter(NumberFormat NUMBER_FORMAT) { 
    NumberFormatter formatter = new NumberFormatter(NUMBER_FORMAT); 
    formatter.setValueClass(Integer.class); 
    formatter.setMinimum(0); 
    formatter.setMaximum(Integer.MAX_VALUE); 
    //formatter.setAllowsInvalid(false); 
    formatter.setCommitsOnValidEdit(true); 


    return formatter; 
} 



public void actionPerformed(ActionEvent e) { 
    if(e.getSource() == this.btnProfit){ 
     this.resultField.setText("" +determineProfitAfterTax(Integer.parseInt(buyPrice.getText().replace(",", "")), Integer.parseInt(sellPrice.getText().replace(",", "")))); 
    } 
} 

private int determineProfitAfterTax(int buyPrice, int sellPrice){ 
    return (int) (sellPrice * (1.00 - EA_TAX)) - buyPrice; 
} 
}`