Inheritance

  class Box
  {
    protected int L,B,H;
    public void setDimension(int x,int y,int z)
    {
        L=x;
        B=y;
        H=z;
    }
    public void volume()
    {
        int v=L*B*H;
        System.out.println("Volume is "+v);
    }
    public void surfaceArea( )
    {
        int a=2*L*H+2*B*H+2*L*B;
        System.out.println("Surface Area is "+a); 
    }
  } 
  class OpenBox extends Box
  {
    public void surfaceArea()
    {
        int a=2*L*H+2*B*H+L*B;
        System.out.println("Surface Area is "+a); 
    }
  }
  class demo
  {
    public static void main(String args[])
    {
        Box a=new Box();
        a.setDimension(2,2,2);
        a.volume();
        a.surfaceArea();
        OpenBox b = new OpenBox();
        b.setDimension(1,1,1);
        b.volume();
        b.surfaceArea();
    }
  }

  class Account
  {
    protected int accno;
    protected double balance;
    public void open(int an,int bl) 
    {
        accno=an;
        balance=bl;
    }
    public void deposit(int amt)
    {
        balance=balance+amt;
    } 
    public void withdraw(int amt)
    {
        balance=balance–amt;
    }
    public void showBalance()
    {
        System.out.println("AccNo is "+accno);
        System.out.println("Balance is "+balance);
    }
  }
  class CAccount extends Account
  {
    public void deposit(int amt)
    {
        balance=balance+amt;
        balance=balance-1;
    }
    public void withdraw(int amt)
    {
        balance = balance–amt;
        balance = balance–1;
    }
  }
  class demo
  {
    public static void main(String args[])
    {
        Account a=new Account();
        a.open(4117,25000);
        a.deposit(5000);
        a.withdraw(2000);
        a.showBalance();
        CAccount b=new CAccount();
        b.open(3012,10000);
        b.deposit(5000);
        b.withdraw(2000);
        b.withdraw(3000);
        b.showBalance();
    }
  }