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我是java的新手，所以放轻松。我正在尝试制作一个简单的游戏，每次单击按钮时都会向变量添加一个。一切正常，但我也在尝试将变量显示到我的 JFrame。这就是问题所在，我单击按钮，它确实向我的变量添加了一个（我将变量打印到控制台以确保）但 JFrame 没有更新变量。我还应该注意，当你第一次打开游戏时，它会打开一个允许你输入用户名的窗口，这是一个单独的类，其中包含我的 main 方法。这是我的第二个窗口的代码，即有问题的窗口：

import javax.swing.BorderFactory;

public class Game extends JFrame {
    private static final long serialVersionUID = 1L;

    private JPanel contentPane;

    private String name;

    public static int pennies = 0;
    public static int dollars = 0;
    public static int moneyAddRate = 1;

    private JButton btnAddMoney = new JButton(new ImageIcon("C:\\Users\\Tanner\\git\\Money-Bags\\res\\coins\\oneCent.png"));

    private Border emptyBorder = BorderFactory.createEmptyBorder();

    public Game(String name) {
        this.name = name;
        createWindow();
    }

    private void createWindow() {
        setTitle(name + "'s Economy");
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(800, 600);
        setLocationRelativeTo(null);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        btnAddMoney.setBounds(329, 244, 96, 96);
        btnAddMoney.setBorder(emptyBorder);
        contentPane.add(btnAddMoney);
        btnAddMoney.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                addMoney();
            }
        });

        JLabel lblPennies = new JLabel("You have " + pennies + " Pennies");
        lblPennies.setBounds(10, 11, 152, 24);
        contentPane.add(lblPennies);

        JLabel lblDollars = new JLabel(dollars + " Dollars");
        lblDollars.setBounds(10, 70, 152, 24);
        contentPane.add(lblDollars);

        JLabel lblAnd = new JLabel("&");
        lblAnd.setBounds(10, 45, 61, 14);
        contentPane.add(lblAnd);

        setVisible(true);

    }

    private void addMoney() {
        pennies += moneyAddRate;
        System.out.println(pennies + "  " + dollars);
        contentPane.validate();
        contentPane.repaint();

    }
}
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1 回答 1

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它没有更新，因为您没有Component使用新pennies金额更新任何内容。您的addMoney()方法应如下所示：

private void addMoney() {
pennies += moneyAddRate;
lblPennies.setText(String.format("You have %d pennies", pennies));
lblPennies.repaint();
}
于 2013-08-17T05:35:01.807 回答