Comparator<Student> score = new Comparator<Student>() {
            public int compare(Student a, Student b){
                if(a.getCgpa() < b.getCgpa())
                return 1;
                else if(a.getCgpa() > b.getCgpa())
                return -1;
                else if(a.getFname().compareTo(b.getFname()) > 0)
                return 1;
                else if(a.getFname().compareTo(b.getFname()) == 0 && a.getId()<b.getCgpa())
                return 1;                
                else
                return -1;
            } 
        };
        Collections.sort(studentList, score);
      	for(Student st: studentList){
			System.out.println(st.getFname());
		}