JFrame背景顏色無法正確更改

Question

我正在創建一個應用程序，該應用程序會創建大量帶有不同背景色的JFrame。起初他們是正確的顏色（黑色和紅色），但所有新的都保持白色。

import java.awt.Color; 
import java.util.Random; 

import javax.swing.JFrame; 

public class JFrameCrash{ 

    private Random r; 
    private int screenHeight; 
    private int screenWidth; 

    private static final int FRAME_HEIGHT = 100; 
    private static final int FRAME_WIDTH = 200; 
    //private static final Color[] COLORS = {Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW, Color.BLACK, Color.WHITE, Color.GRAY, Color.CYAN, Color.PINK, Color.MAGENTA, Color.ORANGE}; 
    private static final Color[] COLORS = {Color.RED, Color.BLACK}; 

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

    public JFrameCrash(){ 
     screenHeight = java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height; 
     screenWidth = java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width; 
     r = new Random(); 
     loop(); 
    } 

    public JFrameCrash(int height, int width, Random rand){ 
     this.screenHeight = height; 
     this.screenWidth = width; 
     r = rand; 
     run(); 
    } 

    private void loop(){ 
     while (true){ 
      new JFrameCrash(screenHeight, screenWidth, r); 
     } 
    } 

    private void constructFrame(){ 
     JFrame frame = new JFrame(); 
     frame.setTitle(""); 
     frame.setLocation(r.nextInt(screenWidth), r.nextInt(screenHeight)); 
     frame.setSize(FRAME_WIDTH, FRAME_HEIGHT); 
     frame.getContentPane().setBackground(COLORS[r.nextInt(COLORS.length)]); 
     frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 
     frame.setResizable(false); 
     frame.setVisible(true); 
    } 
} 

Answer 1

嗯..有趣的.. 試圖給它一些睡眠，給予一定的延遲時間..

這將取決於你的電腦規格。雖然..在我的情況下，我需要給予約100ms的延遲每幀創建.. 它仍然可以運行良好高達444幀，然後我剛剛停止它..

如果我把它減少到50ms延遲，我在200上下的創作同樣的經歷，你..

有一個有趣的編程〜

import java.awt.Color; 
import java.util.Random; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.JFrame; 
import javax.swing.SwingUtilities; 

public class JFrameCrash { 

    private Random r; 
    private int screenHeight; 
    private int screenWidth; 

    private static final int FRAME_HEIGHT = 100; 
    private static final int FRAME_WIDTH = 200; 
    //private static final Color[] COLORS = {Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW, Color.BLACK, Color.WHITE, Color.GRAY, Color.CYAN, Color.PINK, Color.MAGENTA, Color.ORANGE}; 
    private static final Color[] COLORS = {Color.RED, Color.BLACK}; 

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

    public JFrameCrash() { 
     screenHeight = java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height; 
     screenWidth = java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width; 
     r = new Random(); 
     loop(); 
    } 

    public JFrameCrash(int height, int width, Random rand) { 
     this.screenHeight = height; 
     this.screenWidth = width; 
     r = rand; 

     constructFrame(); 
     //run(); 
    } 

    private void loop() { 
     int i = 0; 
     while (true) { 
      new JFrameCrash(screenHeight, screenWidth, r); 
      try { 
       Thread.sleep(100); 
      } catch (InterruptedException ex) { 
       Logger.getLogger(JFrameCrash.class.getName()).log(Level.SEVERE, null, ex); 
      } 
      i++; 
      System.out.println(i); 
     } 
    } 

    private void constructFrame() { 
     SwingUtilities.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       JFrame frame = new JFrame(); 
       frame.setTitle(""); 
       frame.setLocation(r.nextInt(screenWidth), r.nextInt(screenHeight)); 
       frame.setSize(FRAME_WIDTH, FRAME_HEIGHT); 
       frame.getContentPane().setBackground(COLORS[r.nextInt(COLORS.length)]); 
       frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 
       frame.setResizable(false); 
       frame.setVisible(true); 
      } 
     }); 

    } 
}