Game Applet 在 2D 游戏中不运行（while 循环）

Question

我正在尝试为我想创建的游戏设置尺寸。错误在 while(运行ning); 我检查了一个小时，但我似乎无法捕捉到错误。我也在使用 NetbeansIDE setPreserredSize (new Dimension(WIDTH, HEIGHT)); 给我一个错误，它要求创建一个方法“setPrefferedSize(java.awt.Dimension)”。 =25=]

 private void setPreserredSize(Dimension dimension) {
 throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
 }

当我运行时，我得到这个错误

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - illegal start of type
at com.francescstudio.game.Game.<init>(Game.java:67)
at com.francescstudio.game.Start.main(Start.java:16)
Java Result: 1

这里是所有代码

    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.Font;
    import java.awt.Graphics2D;
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import java.awt.image.BufferedImage;

    import javax.swing.JPanel;

    /**
     *
     * @author francesc
     */

    public class Game extends JPanel implements KeyListener, Runnable {

    public static final long SerialVersionUID = 1L;
    public static final int WIDTH = 400;
    public static final int HEIGHT = 630;
    public static final Font main = new Font("Bebas Nue Regular", Font.PLAIN, 28);
    private Thread game;
    private boolean running;
    private BufferedImage Image  = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);

    private long startTime;
    private long elapse;
    private boolean set;

    public Game() {
        setFocusable(true);
        setPreserredSize (new Dimension(WIDTH, HEIGHT)); 
         addKeyListener(this);
    }

    private void update() {
    }

    private void render() {
        Graphics2D g = (Graphics2D) Image.getGraphics();
        g.setColor(Color.white);
        g.fillRect(0, 0, WIDTH, HEIGHT);
        // render board 
        g.dispose();

        Graphics2D g2d = (Graphics2D) getGraphics();
        g2d.drawImage(Image, 0, 0, null);
        g2d.dispose();

    }

    @Override
    public void run() {
    }
    int fps = 0, update = 0;
    long fpsTimer = System.currentTimeMillis();
    double nsPerUpdate = 1000000000.0 / 60;
    // last update time in nano seconds   
    double then = System.nanoTime();
    double unprocessed = 0;

    while (running){

    boolean shouldRender = false;
        double now = System.nanoTime();
        unprocessed += (now - then) / nsPerUpdate;
        then = now;


        // update queque 
        while (unprocessed >= 1) {
            update++;
            update();
            unprocessed--;
            shouldRender = true;
        }

        // render 
        if (shouldRender) {
            fps++;
            render();
            shouldRender = false;
        } else {
            try {
                Thread.sleep(1);
            } catch (Exception e) {
                e.printStackTrace();

            }
        }
    }

    public synchronized start(){ 
        if(running)return; 
        running = true; 
        game = new Thread (this, "game");
        game.start();

    }


     public synchronized stop (){ 
        if(!running) return; 
        running = false; 
        System.exit(0);
    }

    @Override
        public void keyTyped(KeyEvent e) {

    }

    @Override
        public void keyPressed(KeyEvent e) {

    }

    @Override
        public void keyReleased(KeyEvent e) {

    }
    }

Answer 1

你的问题是 while (running) {} 不在方法内部，你在 class 中定义它，它永远不会被调用。

编辑：您的代码应该看起来更像这样

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

/**
 *
 * @author francesc
 */

public class Game extends JPanel implements KeyListener, Runnable {
    public static final long SerialVersionUID = 1L;
    public static final int WIDTH = 400;
    public static final int HEIGHT = 630;
    public static final Font main = new Font("Bebas Nue Regular", Font.PLAIN, 28);
    private Thread game;
    private boolean running;
    private BufferedImage Image  = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);

    private long startTime;
    private long elapse;
    private boolean set;

    public Game() {
        setFocusable(true);
        setPreferredSize(new Dimension(WIDTH, HEIGHT)); 
        addKeyListener(this);
    }
    private void update() {}
    private void render() {
        Graphics2D g = (Graphics2D) Image.getGraphics();
        g.setColor(Color.white);
        g.fillRect(0, 0, WIDTH, HEIGHT);
        // render board 
        g.dispose();

        Graphics2D g2d = (Graphics2D) getGraphics();
        g2d.drawImage(Image, 0, 0, null);
        g2d.dispose();

    }
    @Override
    public void run() {
        int fps = 0, update = 0;
        long fpsTimer = System.currentTimeMillis();
        double nsPerUpdate = 1000000000.0 / 60;
        // last update time in nano seconds   
        double then = System.nanoTime();
        double unprocessed = 0;

        while (running) {

            boolean shouldRender = false;
            double now = System.nanoTime();
            unprocessed += (now - then) / nsPerUpdate;
            then = now;

            // update queque 
            while (unprocessed >= 1) {
                update++;
                update();
                unprocessed--;
                shouldRender = true;
            }
            // render 
            if (shouldRender) {
                fps++;
                render();
                shouldRender = false;
            } else {
                try {
                    Thread.sleep(1);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
    public synchronized start(){ 
        if(running)return; 
        running = true; 
        game = new Thread (this, "game");
        game.start();

    }
    public synchronized stop (){ 
        if(!running) return; 
        running = false; 
        System.exit(0);
    }
    @Override
        public void keyTyped(KeyEvent e) {
    }
    @Override
        public void keyPressed(KeyEvent e) {
    }
    @Override
        public void keyReleased(KeyEvent e) {
    }
}

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