private void priority() {

		for( Process p : processes) {
			if(p.getPriority() == 4) {
				priority_four.add(p);
			}
			if(p.getPriority() == 3) {
				priority_three.add(p);
			}
			if(p.getPriority() == 2) {
				priority_two.add(p);
			}
			if(p.getPriority() == 1) {
				priority_one.add(p);
			}

		}
	}