为什么这不能创建缓冲策略？

Question

我收到一个 Exception in thread "Thread-3" java.lang.InternalError: Could not create a buffer strategy 错误，该错误可以追溯到 Java 的基本代码，它通过游戏 class 下面的第 58 行（ render(); ) 和 77 ( this.createBufferStrategy(5); )。

任何帮助都会很棒，如果您需要查看其他 classes，我还将我的所有代码上传到 github (mitisme/mit)。

import java.awt.Canvas;
import java.awt.Color;
import java.awt.*;
import java.awt.image.BufferStrategy;

public class Game extends Canvas implements Runnable {

   private static final long serialVersionUID = 1L;

   private boolean isRunning = false;
   private Thread thread;
   private Handler handler;

   //Creates background window size and holds objects by handler
   public Game() {
      Screen myScreen = new Screen(1280, 720, "Deed", this);
      start();

      handler = new Handler();
      addKeyListener(new KeyInput(handler));
      handler.addObject(new Player(425, 745, ID.Player, handler));

   }

//starts a new thread
   private void start() {
      isRunning = true;
      thread = new Thread(this);
      thread.start();
   }
   // Stops current thread, and catches exceptions
   private void stop() {
      isRunning = false;
      try {
         thread.join();
      } catch (InterruptedException e) {
         e.printStackTrace();
      }
   }
   //Infinite game loop
   public void run() {
      this.requestFocus();
      long lastTime = System.nanoTime();
      double amountOfTicks = 60.0;
      double ns = 1000000000 / amountOfTicks;
      double delta = 0;
      long timer = System.currentTimeMillis();
      int frames = 0;
      while(isRunning) {
         long now = System.nanoTime();
         delta += (now - lastTime) / ns;
         lastTime = now;
         while(delta >= 1) {
            tick();
            delta--;
         }
         render();
         frames++;

         if(System.currentTimeMillis() - timer > 1000) {
            timer += 1000;
            frames = 0;
         }
      }
      stop();
   }

   public void tick() {
      handler.tick();
   }
   //Holds extra frames before showing (3 extra)
   public void render() {
      BufferStrategy bs = this.getBufferStrategy();
      if(bs == null) {
         this.createBufferStrategy(5);
         return;
      }

      Graphics g = bs.getDrawGraphics();
      /////////////////Renders background first, then handlers///////////////////

      g.setColor(Color.black);
      g.fillRect(0,0,1280,720);

      handler.render(g);

      /////////////////Updates graphics////////////////////
      g.dispose();
      bs.show();

   }
   public static void main(String args[]) {
      new Game();
   }
}

Answer 1

我想通了，this.createBufferStrategy(5); 行只能从 2-4 创建缓冲策略，否则会报错。

为什么这不能创建缓冲策略？

Why could this not create a buffer strategy?

java

exception

awt