SocialGraph

Solution.java

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;

/**
 * Created by felipecalderonbarragan on 7/7/14.
 */
public class Solution {

    public static void main(String[] args) throws Exception{

        new Solution();
    }

    public Solution(){
        Member felipe = new Member("Felipe", "felipeskabarragan@gmail.com");
        felipe.friends = new ArrayList<Member>();

        ArrayList<Member> l3 = new ArrayList<Member>();
        l3.add(new Member("L3-B1", "L3B1@email.com"));
        l3.add(new Member("L-B2", "L3B2@email.com"));
        l3.add(new Member("L3-B3", "L3B3@email.com"));

        Member l2b3 =new Member("Level2-B3", "L2B3@email.com");
        l2b3.friends = l3;

        ArrayList<Member> l2 = new ArrayList<Member>();
        l2.add(new Member("L2-B1", "L2B1@email.com"));
        l2.add(new Member("L2-B2", "L2B2@email.com"));
        l2.add(l2b3);

        Member m1b = new Member("L1-B", "B@email.com");
        m1b.friends = l2;

        felipe.friends.add(new Member("Level1-A", "A@email.com"));
        felipe.friends.add(m1b);

        printSocialGraph(felipe);

    }

    void printSocialGraph(Member member) {
        Queue<Member> queue = new LinkedList<Member>();
        queue.add(member);

        while(queue.size() > 0) {
            Member currentMember = queue.remove();

            if (currentMember == null)
                continue;

            for(Member friend : currentMember.friends)
            queue.add(friend);

            System.out.println("Name: " +currentMember.name+ "Email: "+currentMember.email);
        }

    }

    class Member {
        String name;
        String email;
        List<Member> friends;

        public Member(String name, String email){
            this.name = name;
            this.email = email;
            this.friends = new ArrayList<Member>();
        }

    }
}