这是我尝试执行但失败的代码：
public class Game extends Canvas implements Runnable,KeyListener {
private static final long serialVersionUID = 1L;
private static Thread thread ;
private int width = 240;
private int height = 120;
private int scale = 3;
private boolean isRunning = true;
private BufferedImage image;
public static Spritesheet spritesheet;
private Player player;
Game(){
Dimension dimension = new Dimension(width*scale,height*scale);
this.setPreferredSize(dimension);
image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
}
void initframe() {
JFrame f = new JFrame("Game");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setVisible(true);
f.setLocationRelativeTo(null);
f.setResizable(false);
}
public synchronized void start() {
thread = new Thread(this);
isRunning = true;
thread.start();
}
public synchronized void stop() {
isRunning = false;
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
Game game = new Game();
game.start();
}
void tick() {
}
void render() {
BufferStrategy bs = this.getBufferStrategy();
if(bs == null) {
this.createBufferStrategy(3);
return;
}
Graphics g = image.getGraphics();
g.setColor(Color.GREEN);
g.fillRect(0, 0, width, height);
g.dispose();
g = bs.getDrawGraphics();
g.drawImage(image, 0, 0, width*scale,height*scale,null);
bs.show();
}
public void run() {
long lastTime = System.nanoTime();
double amountOfTicks = 60.0;
double ns = (10^9)/amountOfTicks ;
int frames = 0;
double delta;
double timer = System.currentTimeMillis();
while(isRunning) {
long now = System.nanoTime();
delta = (now - lastTime)/ns ;
lastTime = now;
if(delta >= 1) {
tick();
render();
frames++;
delta--;
}
if(System.currentTimeMillis() - timer >= 1000) {
System.out.println(" A taxa de fps e: "+frames);
frames = 0;
timer+=1000;
}
}
stop();
}
在我看来的错误是：
Exception in thread "Thread-0" java.lang.IllegalStateException: Component must have a valid peer
at java.desktop/java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:4105)
at java.desktop/java.awt.Component$FlipBufferStrategy.<init>(Component.java:4079)
at java.desktop/java.awt.Component$FlipSubRegionBufferStrategy.<init>(Component.java:4611)
at java.desktop/java.awt.Component.createBufferStrategy(Component.java:3942)
at java.desktop/java.awt.Canvas.createBufferStrategy(Canvas.java:195)
at java.desktop/java.awt.Component.createBufferStrategy(Component.java:3866)
at java.desktop/java.awt.Canvas.createBufferStrategy(Canvas.java:170)
at com.main.Game.render(Game.java:83)
at com.main.Game.run(Game.java:115)
at java.base/java.lang.Thread.run(Thread.java:834)
我检查了这段代码的每一行，我不知道为什么表明问题出在我使用的线程或缓冲区策略、方法渲染或运行方法上。