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());
    }