Relationship-in-java-References

package test;

public class Address {
		public long hNo;
		public String sName;
		public String city;
		public int pinCode;
}

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package test;

public class Contact {
	public String mailId;
	public long phNo;
}
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package test;

public class DisplayDetails {
  public void dis(Employee e) {
	  System.out.println(e.toString());
  }
}
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package test;

public class Salary {
	public long bSal;
	public long totSal;
}
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package test;

public class Employee {
	public long eId;
	public String eName;
	public String Desc;
	public Address ad;// creating reference variable
	public Contact co;// creating reference variable
	public Salary sal;// creating reference variable
	public Employee(Address ob1, Contact ob2, Salary ob3) 
	{
		ad = ob1;
		co = ob2;
		sal = ob3;
	}
	public String toString() {
		return eId+"\n"+eName+"\n"+Desc+"\n"+ad.sName+"\n"+ad.city+"\n"+ad.hNo+"\n"+ad.pinCode+"\n"+co.mailId+"\n"+co.phNo+"\n"+sal.bSal+"\n"+sal.totSal;
	}
}

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package test;
public class EmpRegistration {
	public void registration(java.util.Scanner s, Employee e) {
			System.out.println("Give your details for registration");
			System.out.println("Enter the house number");
			e.ad.hNo = Long.parseLong(s.nextLine());
			System.out.println("Enter the street name");
			e.ad.sName = s.nextLine();
			System.out.println("Enter the city name");
			e.ad.city = s.nextLine();
			System.out.println("Enter your mailid");
			e.co.mailId=s.nextLine();
			System.out.println("Enter your register phone number");
			e.co.phNo = Long.parseLong(s.nextLine());
			System.out.println("Enter your basic salary");
			e.sal.bSal=Long.parseLong(s.nextLine());
			System.out.println("Enter your total salary");
			e.sal.totSal=Long.parseLong(s.nextLine());
			System.out.println("Enter the pincode number of your area");
			e.ad.pinCode = s.nextInt();
	}
}

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package maccess;
import test.*;
import java.util.*;
public class DemoReference {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		Address ad = new Address();
		Contact co = new Contact();
		Salary sal = new Salary();
		Employee em = new Employee(ad, co, sal);
		EmpRegistration  reg= new EmpRegistration();
		reg.registration(s,em);
		DisplayDetails dis = new DisplayDetails();
		dis.dis(em);
		s.close();
	}

}