public void setChairAppear() {
    	Chair chair;
    	boolean okey = false;
    	for (int i = 0; i < 10; i++)
    	{
    		okey = false;
    		while (!okey) {
		        Random randomGenerator = new Random();
		        int getX = 1;
		        while (getX % 5 != 0)
		            getX = randomGenerator.nextInt(600-40);
		        int getY = 1;
		        while (getY % 5 != 0)
		            getY = randomGenerator.nextInt(300-40);
		        if (marked[getX][getY] == 0) {
		        	chair = new Chair(""+i,getX, getY);
		        	chairs.set(i,chair);
		        	marked[getX][getY] = 1;
		        	okey = true;
		        }
    		}
    	}
    }