Using Java 8

import java.util.*;

class Student{ private int id; private String fname; private double cgpa; public Student(int id, String fname, double cgpa) { super(); this.id = id; this.fname = fname; this.cgpa = cgpa; } public int getId() { return id; } public String getFname() { return fname; } public double getCgpa() { return cgpa; } }

//Complete the code public class Solution { public static void main(String[] args){ Scanner in = new Scanner(System.in); int testCases = Integer.parseInt(in.nextLine());

    List<Student> studentList = new ArrayList<Student>();
    while(testCases>0){
        int id = in.nextInt();
        String fname = in.next();
        double cgpa = in.nextDouble();

        Student st = new Student(id, fname, cgpa);
        studentList.add(st);

        testCases--;
    }
   Collections.sort(studentList,
    Comparator.comparing(Student::getCgpa).reversed()
    .thenComparing(Student::getFname)
    .thenComparing(Student::getId));

    for(Student st: studentList){
        System.out.println(st.getFname());
    }
}

}