经过半小时的跑步怎么样，这不再有效？

Question

我的目标是创建一个随机生成的点的无限循环。 结果如下：

但由于某种原因，几分钟后，点停止生成，它只是变成黑屏。如果有人有更好的方法，或者可以帮助我，那将是伟大的。

package game;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.color.ColorSpace;
import java.util.Random;

import main.Commons;

public class Background implements Commons {
private int dX = -4;
private int subX = 800;
private int subX2 = 1600;
private Random r = new Random();
private Dot dot;
private Dot sDot;
private final int ARRAY_LENGTH = 100;
private int[] xPos = new int[ARRAY_LENGTH];
private int[] yPos = new int[ARRAY_LENGTH];
private int[] size = new int[ARRAY_LENGTH];
private Color[] cArray = new Color[ARRAY_LENGTH];
private int[] xPos2 = new int[ARRAY_LENGTH];
private int[] yPos2 = new int[ARRAY_LENGTH];
private int[] size2 = new int[ARRAY_LENGTH];
private Color[] cArray2 = new Color[ARRAY_LENGTH];
private boolean init1 = true;
private boolean init2 = true;

public Background() {
    subX = 0;
    subX2 = WIDTH;
}

public void update() {
    subX += dX;
    subX2 += dX;
}

public void paint(Graphics g) {
    // background
    g.setColor(Color.black);
    g.fillRect(0, 0, WIDTH, HEIGHT);
    // dots
    if (init1 || subX < -WIDTH) {
        for (int i = 0; i < ARRAY_LENGTH; i++) {
            xPos[i] = r.nextInt(WIDTH);
            yPos[i] = r.nextInt(HEIGHT);
            size[i] = r.nextInt(4);
            cArray[i] = new Color(r.nextInt(256), r.nextInt(256),
                    r.nextInt(256));

        }
        init1 = false;
    }

    if (init2 || subX2 < -WIDTH) {
        for (int i = 0; i < ARRAY_LENGTH; i++) {
            xPos2[i] = r.nextInt(WIDTH);
            yPos2[i] = r.nextInt(HEIGHT);
            size2[i] = r.nextInt(4);
            cArray2[i] = new Color(r.nextInt(256), r.nextInt(256),
                    r.nextInt(256));

        }
        init2 = false;
    }

    if (!init1) {
        for (int i = 0; i < ARRAY_LENGTH; i++) {
            dot = new Dot(xPos[i] + subX, yPos[i], size[i], cArray[i]);
            dot.paint(g);
        }

        if (subX == -WIDTH) {
            init1 = true;
            subX = WIDTH;
        }

    }

    if (!init2) {
        for (int i = 0; i < ARRAY_LENGTH; i++) {
            sDot = new Dot(xPos2[i] + subX2, yPos2[i], size2[i], cArray2[i]);
            sDot.paint(g);
        }
        if (subX == 0) {
            init2 = true;
            subX2 = WIDTH;
        }
    }
}
}

---

package game;

import java.awt.Color;
import java.awt.Graphics;

import main.Commons;

public class Dot implements Commons {
int x;
int y;
int size;
int loopTimes = 0;
Color c;

public Dot(int x, int y, int size, Color c) {
    this.x = x;
    this.y = y;
    this.size = size;
    this.c = c;
}

public void paint(Graphics g) {
    g.setColor(c);
    g.fillRect(x + (WIDTH * loopTimes), y, size, size);
}
}

感谢所有帮助，

-Steve