线程"AWT-EventQueue-0"中的异常？

Question

我正在使用java和javax.swing编写一个简单的计算器程序

基本上,当您按下按钮时,程序应该获取该按钮的功能(数字或操作)并将其显示在textArea中.

计算器本身的整个逻辑并不重要.此外,还有一个清除菜单项,清除textArea中的所有文本.

但是,每按一次按钮,我都会收到以下错误:

计算器中的线程"AWT-EventQueue-0"java.lang.NullPointerException异常.CalculatorGUI.actionPerformed(CalculatorGUI.java:106)

当我按下清除菜单项时,我也遇到类似的错误,当我想要更改文本区域中的文本时,似乎java不喜欢它.

这是我的代码:( 第106行是在actionPerfomed方法中,为了方便起见,我标记了它)

public class CalculatorGUI implements ActionListener 
{

    // The calculator for actually calculating!
    // private RPNCalculator calculator;

    // The main frame for the GUI
    private JFrame frame;

    // The menubar for the GUI
    private JMenuBar menuBar;

    // The textbox
    private JTextArea textArea;
    private JScrollPane scrollArea;

    // Areas for numbers and operators
    private JPanel numKeysPane;
    private JPanel opKeysPane;

    private String input;
    final String[] numbers = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0" };
    final String[] operations = { "+", "-", "*", "/" };

    /**
     * Constructor
     */
    public CalculatorGUI() {
        // Initialize the calculator
        calculator = new RPNCalculator();
    }

    /**
     * Initialize and display the calculator
     */
    public void showCalculator() {

        String buttonValue;
        JButton button;
        JMenu menu;
        JMenuItem menuItem;

        // Create the main GUI components
        frame = new JFrame("RPN Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        numKeysPane = new JPanel(new GridLayout(4, 3));
        opKeysPane = new JPanel(new GridLayout(2, 2));

        initializeMenu();
        initializeNumberPad();
        initializeOps();


        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        JScrollPane scrollArea = new JScrollPane(textArea);

        // Create the components to go into the frame and
        // stick them in a container named contents
        frame.getContentPane().add(numKeysPane, BorderLayout.CENTER);
        frame.getContentPane().add(scrollArea, BorderLayout.NORTH);
        frame.getContentPane().add(opKeysPane, BorderLayout.LINE_END);

        // Finish setting up the frame, and show it.
        frame.pack();
        frame.setVisible(true);
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public void actionPerformed(ActionEvent e) {
        String s = (String)e.getActionCommand();
        // calculator.performCommand(s);
        textArea.append(s + " ");      // <<--- THIS IS LINE 106
    } 

    /**
     * Initialize the number pad for the calculator
     */


    private void initializeNumberPad() {
        JButton button;
        for (int i = 0; i < numbers.length; i++) {
            button = new JButton(numbers[i]);
            button.addActionListener(this);
            numKeysPane.add(button);
        }
    }

    private void initializeOps(){
        JButton button;
        for (int i = 0; i < operations.length; i++){
            button = new JButton(operations[i]);
            button.addActionListener(this);
            opKeysPane.add(button);
        }
    }

    /**
     * Initialize the menu for the GUI
     */
    private void initializeMenu() {
        JMenu menu;
        JMenuItem menuItem;
        JMenuItem menuItem2;

        // Create a menu with one item, Quit
        menu = new JMenu("Calculator");
        menuItem = new JMenuItem("Quit");
        // When quit is selected, destroy the application
        menuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                // A trace message so you can see this
                // is invoked.
                System.err.println("Close window");
                frame.setVisible(false);
                frame.dispose();
            }
        });
        menuItem2 = new JMenuItem("Clear");
        menuItem2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e){
                textArea.setText("");
            }
        });
        menu.add(menuItem2);
        menu.add(menuItem);

        // Create the menu bar
        menuBar = new JMenuBar();
        menuBar.add(menu);
        frame.setJMenuBar(menuBar);
    }

    /**
     * Helper method for displaying an error as a pop-up
     * @param message The message to display 
     */
    private static void errorPopup(String message) {
        JOptionPane.showMessageDialog(null, message);
    }
}

任何帮助将不胜感激!谢谢!

Answer 1

您永远不会初始化JTextArea调用的成员字段textArea.您正在影响声明中的成员字段.试试这个:

 textArea = new JTextArea();
 textArea.setEditable(false);
 textArea.setLineWrap(true);
 textArea.setWrapStyleWord(true);

代替

 JTextArea textArea = new JTextArea();
 textArea.setEditable(false);
 textArea.setLineWrap(true);
 textArea.setWrapStyleWord(true);