Undergraduate

public class Undergraduate extends Student{
    private int level;
    public Undergraduate(){

        super();
        level = 1;
        }
public Undergraduate(String initialName,
    int initialStudentNumber, int initialLevel){

        super(initialName, initialStudentNumber);
        setLevel(initialLevel);
        }
public int getLevel(){

        return level;
        }
public void setLevel(int newLevel){

        if ((1 <= newLevel) && (newLevel <= 4))
            level = newLevel;
        else{
            System.out.println("No such undergraduate class! ");
            System.exit(0);
            }
            }
public void writeOutput(){

        super.writeOutput();
        System.out.println("StudentLevel: " + level);
    }
}