private static void updateTables(){ 
		for(int k= 0;k < Students.size(); k++){
			Student stu = (Student) Students.get(k);
			
			//since 30 is the unassigned table values are not changed until student has been assigned
			if(stu.getTableNum() != 30){
				stu.setLastTableThree(stu.getLastTableTwo());
				stu.setLastTableTwo(stu.getLastTableOne());
				stu.setLastTableOne(stu.getTableNum());
			}
		}
	}