import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Member{
    private String firstname;
    private String lastname;
    private String role;
    private int grade;
    private String email;

    public Member(String firstname, String lastname, String role, int grade, String email){
        this.firstname = firstname;
        this.lastname = lastname;
        this.role = role;
        this.grade = grade;
        this.email = email;
    }

    public String toString() {
        return String.format("%s\t%s\t%s\t%d\t%s", firstname, lastname, role, grade, email);
    }

    public static void main(String[] args){
        List<Member> listMembers = new ArrayList<Member>();

        listMembers.add(new Member("Vidhi", "Kulkarni", "Scrum Master", 11, "vidhi@gmail.com"));
        listMembers.add(new Member("Riya", "Patil", "Frontend", 11, "riya@gmail.com"));
        listMembers.add(new Member("Lily", "Wu", "DevOps", 11, "lily@gmail.com"));
        listMembers.add(new Member("William", "Wu", "Backend Developer", 11, "william@gmail.com "));
        

        for (Member n : listMembers){
            System.out.println(n);
        }
    }
}

Member.main(null);
Vidhi	Kulkarni	Scrum Master	11	vidhi@gmail.com
Riya	Patil	Frontend	11	riya@gmail.com
Lily	Wu	DevOps	11	lily@gmail.com
William	Wu	Backend Developer	11	william@gmail.com