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  1.  
  2.  
  3.         import java.io.*;
  4. class calculatebill
  5. {
  6.     double billpay;
  7.     void bill(long units)
  8.     {
  9.         if(units<100)
  10.         billpay=units*1.20;
  11.         else if(units<300)
  12.         billpay=100*1.20+200*2+(units-100)*2;
  13.         else if(units>300)
  14.         billpay=100*1.20+200*2+(units-300)*3;
  15.     }
  16.    }
  17.    class computeelectricitybill extends calculatebill
  18.    {
  19.        public static void main(String args[])
  20.        {
  21.            long units;
  22.            DataInputStream in = new DataInputStream(System.in);
  23.            System.out.println("calculate bill using inheritance");
  24.            try
  25.            {
  26.                System.out.println("enter no of units:");
  27.                units=Integer.parseInt(in.readLine());
  28.                computeelectricitybill b= new computeelectricitybill();
  29.                b.bill(units);
  30.                System.out.println("bill to pay:"+b.billpay);
  31.            }
  32.            catch(Exception e){}
  33.        }
  34.    }    
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  40.  
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  42.  
Success #stdin #stdout 0.1s 54688KB
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calculate bill using inheritance
enter no of units:
https://ideone.com/liRdbQ
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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