Question

为什么我在调试或运行时获得空白屏幕而不是黑屏？我到处寻找并尝试了很多！请帮忙。我只是想让我的屏幕变黑，因为我是所有这些java编码的初学者。我不相信代码有任何问题，因为我没有收到任何错误。我正在使用eclipse。

package com.techon.rain;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;

import javax.swing.JFrame;

public class Game extends Canvas implements Runnable {
private static final long serialVersionUID = 1L;

public static int width =300;
public static int height = width / 16 * 9;
public static int scale =3;

private JFrame frame;
private Thread thread;
private boolean running = false;

public Game() {
    Dimension size = new Dimension(width*scale, height*scale);
    setPreferredSize(size);
    frame = new JFrame();
}

public synchronized void start() {
    running = true;
    thread = new Thread(this, "Display");
    thread.start();
}
public synchronized void stop() {
    running = false;
    try {
        thread.join();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}
public void run() {
    while(running);{
        update();
        render();
}
}
public void update() {

}

public void render() {
    BufferStrategy bs = getBufferStrategy();
    if(bs == null) {
        createBufferStrategy(3);
        return;
    }
    Graphics g = bs.getDrawGraphics();
    g.setColor(Color.BLACK);
    g.fillRect(0,0,getWidth(),getHeight());
    g.dispose();
    bs.show();
}

public static void main(String[] args) {
    Game game = new Game();
    game.frame.setResizable(false);
    game.frame.setTitle("Rain");
    game.frame.add(game);
    game.frame.pack();
    game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    game.frame.setLocationRelativeTo(null);
    game.frame.setVisible(true);

    game.start();
}
}

Answer 1

替换

public void run() {
    while(running);{
        update();
        render();
}

通过

public void run() {
    while(running){
        update();
        render();
}

由于while（跑步）;它没有在循环中执行其他的stetement。

JFrame Java setColor和fillRect保持空白？

1 个答案: