How can prevent Interface inheritance to another class?

[Prabhat Ranjan]

Hi All,

Can we prevent inheritance for other class and want to give access to know class?

There is a interface A_Plan put in same package.

package airtel;

public interface A_Plan {
	
	public void display_A();

}

package airtel;
public class AirTel implements A_Plan{
	public void display_A(){
		System.out.println("AirTel Plan for Air Tel only");
	}
	
	public static void main(String args[]){
		
		AirTel obj = new AirTel();
		obj.display_A();
	}
}

so above code is fine as want to give access to airtel for Plan A not want to give access this plan to Virgin Mobile or Vadaphone.

But Vadaphone class can access my Plan A using import pkg.interfacename.

import airtel.A_Plan;

public class VodaPhone implements A_Plan{
	
	public void display_A(){
		System.out.println("Vadaphone inherited AirTel Plan ");
	}
	
	public static void main(String args[]){
		
		VodaPhone obj = new VodaPhone();
		obj.display_A();
	}

}

So is there any way so that i want to restrict the inheritance of the above plan A to other class B.

[Jayesh A Lalwani]

Inheritance is wrong here. Inheritance should have IS A relationship. In your case, Airtel IS NOT A Plan A

[Prabhat Ranjan]

you mean to say A_Plan should be class or abstract class and it should extend not implement the interface as below

public class AirTel extends A_Plan{

do you mean is this is IS-A relation?

please confirm.

[Jayesh A Lalwani]

IS A relation means exactly what it sounds like. Is Airtel a A_plan? No. then Airtel shouldn't extend A_Plan. Does Airtel provide A_Plan? yes. then AIrtel should have a method that returns A_Plan