Inheritance

//AIM: Write a program in Java to demonstrate single inheritance, multilevel inheritance and hierarchical inheritance.

//CODE:
class pin{	//it is parent class and print pincode
	int gpin=380009;
	int hpin=382350;
	char o;
	void pin(char o){ 
		this.o=o;
		if(o=='H'){
			System.out.println(hpin);
		}
		else{
			System.out.println(gpin);
		}
	}
}
//we have to use extends keyword in order to inherit functionality of other class
//simple inheritance
class India extends pin{	//it is child class of pin class 
	char o;
	void indiaadd(char o){
		this.o=o;
		System.out.print(",India");
		super.pin(o);
	}
}
//multilevel
class Guj extends India{	//it is multilevel because this class inhertis India class which (India) is child class of pin class that's how there is multiple level of inheritance
	char o;
	void gujadd(char o){
		this.o=o;
		System.out.print(",Gujarat");
		super.indiaadd(o);
	}
}
class ahm extends Guj{	//multilevel
	char o;
	void ahmadd(char o){
		this.o=o;
		System.out.print(",Ahmedabad");
		super.gujadd(o);
	}
}
//hierarchical inheritance
class home extends ahm{
	void homeadd(){
		System.out.print("C-203,Surabhi Residency,Nikol");
		super.ahmadd('H');
	}
}
//hierarchical inheritance
class gpg extends ahm{
	void gpgadd(){
		System.out.print("GPG, opp. PRL ");
		super.ahmadd('G');
	}
}

public class inheritance_ex{
	public static void main(String args[]){
		System.out.println("\n\nCollege Address");
		gpg obj1 = new gpg();
		obj1.gpgadd();
		System.out.println("\n\nHome Address");
		home obj2 = new home();
		obj2.homeadd();
	}
}