BuilderDesignPattern

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */

class DP {
	String firstName;
	String lastname;
	String middleName;
	String postalCode;
	String address;
	String phoneNumber;
	
	DP() {
		firstName="";
		lastname="";
		middleName="";
		postalCode="";
		address="";
		phoneNumber="";
	}
	DP(Builder b) {
		firstName=b.firstName;
		lastname=b.lastname;
		middleName=b.middleName;
		postalCode=b.postalCode;
		address=b.address;
		phoneNumber=b.phoneNumber;
	}
	@Override
	public String toString() {
		String ret = "";
		if(!firstName.equals("")) {
			ret+=firstName +" ";
		}
		else if(!lastname.equals("")) {
			ret+=lastname +" ";
		}
		return ret;
	}
	static class Builder {
		String firstName="";
	String lastname="";
	String middleName="";
	String postalCode="";
	String address="";
	String phoneNumber="";
		Builder() {
		}
		public DP build() {
			return new DP(this);
		}
		public Builder setFirstName(String str) {
			firstName = str;
			return this;
		}
		public Builder setLastName(String str) {
			lastname = str;
			return this;
		}
		public Builder setMiddleName(String str) {
			middleName = str;
			return this;
		}
		public Builder sePostalCode(String str) {
			postalCode = str;
			return this;
		}
		public Builder setAddress(String str) {
			address = str;
			return this;
		}
		public Builder setPhoneNumber(String str) {
			phoneNumber = str;
			return this;
		}
	}
}
class Ideone
{
	
	public static void main (String[] args) throws java.lang.Exception
	{
		DP o1 = new DP.Builder().setFirstName("Abhinav").build();
		System.out.println(o1);
	}
}