using java 7

import java .util.Scanner; public class trade { public static void main(String argsp[]) { Scanner scan=new Scanner(System.in); int n; n=scan.nextInt(); int price[]=new int[n]; int days[]=new int[n];

   for(int i=0;i<n;i++)
   {
    price[i]=scan.nextInt();
    int j=i;
    days[i]=++j;      
 }
 for(int i=0;i<n;i++)
 {
 System.out.print( price[i] +" ");
// System.out.print(days[i]);
 }
 System.out.println();
 //minimum value to find out
 int min=price[0];
 int day=0;
 int max=price[0];
 for(int i =1;i<n;i++)
 {
    if(min>price[i])
    {
        min=price[i];
        day=i;

    }
    if(max<price[i])
    {
       max=price[i];
    }
 }
 System.out.println(" trade price "+" "+min +" buy on date"+" "+ (day+1));
 System.out.println(" trade price while selling it"+" "
 + " sold on this day"+ (day+1));
  int profit=max-min;
  if(profit>0)
  {
    System.out.println(" seller found their profit"+ " = "+profit);
  }
  else if(profit<=0 )
  {
     System.out.println(" trader is in loss");
  }


}

}

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());
    }
}

}

    Comparator<Student> cgpaComp = (s1, s2) -> Double.valueOf(s2.getCgpa()).compareTo(Double.valueOf(s1.getCgpa()));
    Comparator<Student> nameComp = (s1, s2) -> s1.getFname().compareTo(s2.getFname());
    Comparator<Student> idComp = (s1, s2) -> Integer.valueOf(s1.getId()).compareTo(Integer.valueOf(s2.getId()));

    studentList = studentList.
            stream().
            sorted(cgpaComp.thenComparing(nameComp).thenComparing(idComp)).
            collect(Collectors.toList());

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--;
    }
    //String [] a=new String[testCases];
    for(int i=0;i<studentList.size()-1;i++){
        for(int j=0;j<studentList.size()-1;j++){
            if(studentList.get(j).getCgpa()<studentList.get(j+1).getCgpa()){
                Student sl=studentList.get(j);
                studentList.set(j, studentList.get(j+1));
                studentList.set(j+1, sl);
            }
            else if(studentList.get(j).getCgpa()==studentList.get(j+1).getCgpa()){
                if(studentList.get(j).getFname().compareTo(studentList.get(j+1).getFname())>0){
                    Student sl=studentList.get(j);
                    studentList.set(j, studentList.get(j+1));
                    studentList.set(j+1, sl);
                }
            }
        }
    }

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

}