code: private void drawInterfere(Graphics2D g) {
  		final ThreadLocalRandom random = RandomUtil.getRandom();
  
  		for (int i = 0; i < this.interfereCount; i++) {
  			g.setColor(ImgUtil.randomColor(random));
  			g.drawOval(random.nextInt(width), random.nextInt(height), random.nextInt(height >> 1), random.nextInt(height >> 1));
  		}
  	}
docs: 画随机干扰
  
  @param g {@link Graphics2D}