java - 编译错误 : illegal start of expression

Question

我正在学习 Java(游戏方面)。我买了一本书，里面有一些我试图复制和测试的代码。唯一的问题是当我尝试编译它时出现错误。

C:\Users\James\Desktop\Java>Javac GamePanel.java                                        
GamePanel.java:57: illegal start of expression                              
        private void gameUpdate()                                   
        ^                         
GamePanel.java:57: illegal start of expression                             
        private void gameUpdate()                               
                ^                                              
GamePanel.java:57: ';' expected                        
        private void gameUpdate()                                 
                               ^                      
GamePanel.java:64: reached end of file while parsing                                
}→                   
 ^                                    
4 errors              

代码是:

public class GamePanel extends  JPanel implements Runnable
{
    private static final int PWIDTH = 500;
    private static final int PHEIGHT = 400;

    private Thread animator;
    private volatile boolean running = false;

    private volatile boolean gameOver = false;

    public GamePanel()
    {
        setBackground(Color.white);
        setPreferredSize( newDimension(PWIDTH, PHEIGHT));
    }

    public void addNotify()
    {
        super.addNotify();
        startGame();
    }

    public void startGame()
    {
        if (animator == null || !running)
        {
            animator = new Thread(this);
            animator.start();
        }
    }

    public void stopGame()
    {
        running = false;    
    }

    public void run()
    {
        running = true;
        while(running)
        {
            gameUpdate();
            gameRender();
            repaint();

            try
            {
                Thread.sleep(20);
            }
        catch(InterruptedException ex)
        {

        }
        System.exit(0);
    }

    private void gameUpdate()
    {
    if (gameOver == false) {

    }
    }

}

我知道我可能做错了什么，但我一遍又一遍地检查，有人能告诉我我做错了什么吗？

Answer 1

您缺少 } while 循环未关闭。

public void run()
{
    running = true;
    while(running)
    {
        gameUpdate();
        gameRender();
        repaint();

        try
        {
            Thread.sleep(20);
        }
        catch(InterruptedException ex)
        {

        }
    } // <<< this is the missing brace
    System.exit(0);
}

你可能想要一个类似 eclipse 的 IDE , netbeans或 intellij (全部免费)并使用它们来格式化您的代码...当您的代码格式正确时，缺少大括号之类的东西会变得更容易找到。