JFrame背景色未正確更改

Question

我正在創建一個應用程序，該應用程序使用不同的背景顏色創建大量的JFrame。 首先，它們是正確的顏色（黑色和紅色），但是所有新顏色都保持白色。

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..有趣的一個..試着給它一點睡眠，給一些延遲時間..

這將取決於您的計算機規格。 雖然..在我的情況下，我需要給每幀創建大約100ms的延遲..它仍然可以很好地工作到444幀，然后我停止了它。

如果我將其減少到50ms延遲，我在大約200倍的創作過程中會獲得與您相同的體驗。

玩得開心〜

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);
            }
        });

    }
}