simulated datsets in java

import java.util.*;

import java.io.*;

class Student{

    String id,firstname,lastname,city;

    Student(String firstname,String lastname,String city){

        this.id=UUID.randomUUID().toString();

        this.firstname=firstname;

        this.lastname=lastname;

        this.city=city;

    }

}

public class uid {

    public static void main(String[] args){

        ArrayList<Student> student=new ArrayList<>();

        Scanner sc=new Scanner(System.in);

        System.out.println("Enter no. of records:");

        int n=sc.nextInt();

        sc.nextLine();

        int count=0;

        while(n-->0){

            System.out.println("Enter the record details for s"+(count+1)+":");

            String firstname=sc.nextLine();

            String lastname=sc.nextLine();

            String city=sc.nextLine();

            Student s=new Student(firstname,lastname,city);

            student.add(s);

            count++;

        }

        try{

            FileWriter fw=new FileWriter("students.csv");

            fw.write("ID,FIRSTNAME,LASTNAME,CITY\n");

            for(Student s:student)

                fw.write(s.id+","+s.firstname+","+s.lastname+","+s.city+"\n");

            fw.close();

        }catch(Exception e){

            e.printStackTrace();

        }

    }

} 

output:

C:\Users\akhil\OneDrive\Desktop\cn>javac uid.java

C:\Users\akhil\OneDrive\Desktop\cn>java uid

Enter no. of records:

5

Enter the record details for s1:

101

akhil

darapu

Enter the record details for s2:

akhil

dara

tpe

Enter the record details for s3:

eee

dd

ee

Enter the record details for s4:

eee

dd

ddd

Enter the record details for s5:

dddd

eee

rrr