Program to implement inheritance

/* Program to implement simple Inheritance */

Single inheritance

class A

{

            int a1;            //public by default

            protected int a2;   //protected to A

            void showa1a2()

            {

                                    System.out.println("a1 : "+a1+", a2 : "+a2);

            }

}

//create a subclass by extending A

class B extends A

{

            int b;

            void showb()

            {

                        System.out.println("b : "+b);

            }

            void sum()

            {

                        System.out.println("a1+a2+b : "+(a1+a2+b));

            }

}

class SimpleInheritance

{

            public static void main(String args [])

            {

                        B subob=new B();

                        subob.a1=10;

                        subob.a2=20;

                        subob.b=30;

                        subob.showa1a2();

                        subob.showb();

                        subob.sum();

            }

}

Multilevel  Inheritance

import java.util.*;

class Input

{

public int l,b,h;

   void getData()

{

System.out.println("Enter l ,b and h of cuboid");

Scanner sc=new Scanner(System.in);

l=sc.nextInt();

b=sc.nextInt();

h=sc.nextInt();

}

}

class Area extends Input

{

public int a;

   void area_r()

{

a=l*b;

}

}

class Volume extends Area

{

public int v;

   void vol_r()

{

v=a*h;

System.out.println("Volume of cuboid:"+v);

}

}

class Cuboid

{

public static void main(String args[])

{

Volume k=new Volume();

k.getData();

k.area_r();

k.vol_r();

}

}

Hierarchical  Inheritance

import java.util.*;

class Customer

{

public int id ;

public String n;

void getData()

{

System.out.println("Enter Name and ID");

Scanner sc=new Scanner(System.in);

 n=sc.nextLine();

id=sc.nextInt();

}

}

class Account extends Customer

{

public float balance;

public int account_no;

void Input()

{

System.out.println("Enter Account No. and Balance");

Scanner sc=new Scanner(System.in);

account_no =sc.nextInt();

balance=sc.nextFloat();

}

void Display()

{

System.out.println("1. Account No.:"+account_no);

System.out.println("2. Balance_b:"+balance );

}

}

class Loan extends Customer

{

public float amount;

public int loan_no;

void Input()

{

System.out.println("Enter Loan No. and Amount");

Scanner sc=new Scanner(System.in);

loan_no =sc.nextInt();

amount=sc.nextFloat();

}

void Display()

{

System.out.println("1. Loan No.:"+loan_no );

System.out.println("2. Amount"+amount);

}

}

class Bank

{

public static void main(String args[])

{

Account k=new Account();

k.getData();

k.Input();

k.Display();

Loan l=new Loan();

l.getData();

l.Input();

l.Display();

}

}