试图将我的屏幕颜色更改为黑色
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【中文标题】试图将我的屏幕颜色更改为黑色【英文标题】：Trying to change the color of my screen to black 【发布时间】：2015-09-20 21:33:00 【问题描述】：，但我有一个 IllegalStateExeption b/c，它说组件必须是我正在使用 NetBeans 的有效对等体。
这里是详细版本：
Exception in thread "Window" java.lang.IllegalStateException: Component must have a valid peer
at java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3998)
at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3972)
at java.awt.Component$FlipSubRegionBufferStrategy.<init>(Component.java:4495)
at java.awt.Component.createBufferStrategy(Component.java:3849)
at java.awt.Canvas.createBufferStrategy(Canvas.java:194)
at java.awt.Component.createBufferStrategy(Component.java:3773)
at java.awt.Canvas.createBufferStrategy(Canvas.java:169)
at com.gamestormjr.Performance.render(Performance.java:34)
at com.gamestormjr.main.TestRun.run(TestRun.java:72)
at java.lang.Thread.run(Thread.java:745)
这是我的代码；我有 4 个不同的类，其中一个引用了其他三个，类名是“TestRun”：
测试运行：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.gamestormjr.main;
import com.gamestormjr.Performance;
import com.gamestormjr.Performance;
import com.gamestormjr.Window;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author amani
*/
public class TestRun extends Window implements Runnable
public static void main(String... args)
System.out.println("Starting...");
Window win = new Window();
win.Window();
/**
* Thread that helps handle the game being produced.
*/
private Thread thread;
private boolean running = false;
public synchronized void start()
running = true;
thread = new Thread(this);
/**
* What this will do is, it will create a separate thread that handles
* the Updates.
* <> This is really good for making games more efficient.
*/
thread = new Thread(this, "Window");
/**
* What this will do is, it will create a new thread that will handle
* the Rendering.
* <> This is really good for making games more efficient.
*/
// thread = new Thread(this, "Render");
thread.start();
/**
* To help manage Threads.
*/
public synchronized void stop()
running = false;
try
thread.join();
catch (InterruptedException ex)
Logger.getLogger(TestRun.class
.getName()).log(Level.SEVERE, null, ex);
public void run()
while (running)
Time time = new Time();
Performance render = new Performance();
render.render();
窗口类：
/**
* <Javadoc Codes>
* The Declaration for my Project; I this case it's for my game.
*
*/
package com.gamestormjr;
import com.gamestormjr.main.TestRun;
import java.awt.*;
import javax.swing.JFrame;
/**
* <Javadoc Codes>
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates and open the template
* in the editor.
*
*
*
* @author amani
*/
public class Window extends Canvas
private static final long serialVersionUID = -1L;
public static int width = 800;
public static int height = 600;
public JFrame win;
/**
* <Javadoc Codes>
* <html>
* <b> Input -- <font color="blue">
* public
* </font>
* ClassName()
* </b>
* <p>
* What this method does is that it tells JVM that it's ready to be called
* upon.
* </p>
*
* @param DataType <font color="blue">
* public, private, static, void, protected, boolean
* </font>
* @param Method ClassName
* </html>
*/
public void Window()
System.out.println("Started...");
Window window = new Window();
win = new JFrame();
win.setResizable(false);
win.setTitle("Game");
win.setSize(800, 500);
win.setLocationRelativeTo(null);
win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
win.setVisible(true);
TestRun test = new TestRun();
test.start();
时间类；我不认为这是问题所在，只有一行代码 但是还是
测试类：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.gamestormjr.main;
/**
*<JavaDoc Codes>
public class Time
/**
* Data type long ass variable "SECOND" : is .equal() = 1000MILISECONDS
* (ms); which is equal() = 1SECOND.
*/
public static long SECOND = 1000;
public void update()
最后，错误开始的目的地； 性能类：
性能等级：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.gamestormjr;
import java.awt.*;
import java.awt.image.BufferStrategy;
/**
*
* @author amani
*/
public class Performance extends Canvas
public void render()
/**
* <b>This creates a temporary storage </b>
* <font color="blue"> OpenGL </font color="blue">. is a Great example
* of this. What this does is that it creates and stores frame before
* they're ready to be showed.
*/
BufferStrategy bs = getBufferStrategy();
// We only want to do this once so...
if (bs == null)
/*
What this does is it tells the BufferStategy(), to buffer "n" number of rendering.
This is Short for Speed Improvement.
Higher # = More frames Stored and ready to be placed.
Lower # = Less frames Stored and ready to be placed.
*/
createBufferStrategy(3);
return;
Graphics g = bs.getDrawGraphics();
g.setColor(Color.black);
g.fillRect(0, 0, getWidth(), getHeight());
/*
This removes finished/un-used graphics.
Buffer swapping AKA(Blitting)
*/
g.dispose();
/*
This makes the next available buffer available.
*/
bs.show();
如果有人知道可能出了什么问题，请尽快帮助我。
【问题讨论】：
Illegal State Exception when creating new Bufferstrategy的可能重复 【参考方案1】：你的代码一团糟。
您有一个名为Window 的类，它扩展了Canvas，但实际上从未添加到任何东西或以任何方式使用。不要使用 Window 或 Frame 这样的名称，这些类已经存在
实际进行渲染的Performance 永远不会添加到您的JFrame (win)，但即使您这样做了，您也会在TestRun 中创建它的另一个实例，因此您尝试绘制屏幕外的东西
首先在Window中创建Performance的实例变量
public class Window // 这什么都不做 extends Canvas
private static final long serialVersionUID = -1L;
public static int width = 800;
public static int height = 600;
public JFrame win;
private Performance performance;
更改您的Window 方法并使其成为构造函数并创建Performance 的实例并将其添加到win
public Window()
System.out.println("Started...");
win = new JFrame();
performance = new Performance();
win.add(performance);
在win 中为performance 创建一个getter
protected Performance getPerformance()
return performance;
删除...
TestRun test = new TestRun();
test.start();
来自Window的构造函数
更改您的main 方法以创建TestRun 的实例而不是Window...
public static void main(String... args)
System.out.println("Starting...");
//Window win = new Window();
//win.Window();
TestRun test = new TestRun();
test.start();
将TestRun 的run 方法更改为使用来自Window 的performance 实例，您已继承...
public void run()
while (running)
Time time = new Time();
getPerformance().render();
也许，只是也许，如果程序大神好心，它会运行
【讨论】：
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