private static void initStuIDVec() {
		StuIDs.clear();
		unAssignedStudents.clear();
		for (int i = 0; i < Students.size(); i++) {
			Student thisStu = new Student((Student) Students.get(i));
			StuIDs.add(thisStu.getID());
			unAssignedStudents.add(thisStu.getID());
		}
		System.out.println("initStuIDVec");
		for (int i = 0; i < unAssignedStudents.size(); i++)
			System.out.print(unAssignedStudents.get(i) + " ");
	}