Electricity bill program in Java

In this article, you will learn a Java program to calculate electricity bills based on some conditions using if-else statements. The electricity consumption charge is easy to understand and calculate. It is measured in kWh (kilowatt hours). The rate of electricity bills varies depending on the geographic location and the amount of consumption. Suppose we have the following conditions for rates of electricity calculation-

• First 1 to 100 units– Rs. 8/unit
• Next 100 to 200 units– Rs. 12/unit
• Next 200 to 300 units– Rs. 16/unit
• Above 300 units– Rs. 20/unit

We can apply the following logic step by step to calculate the electricity bill based on the above conditions.

• Step1: If the units of consumption are less than or equal to 100, then the total electricity bill will be:
  

  Total Electricity Bill = units * 8 

• Step2: If the units of consumption are less than or equal to 200, then the total electricity bill will be:
  

  Total Electricity Bill = 100 * 8 + (units - 100) * 12 

• Step3: Else If the units of consumption are less than or equal to 300, then the total electricity bill will be:
  

  Total Electricity Bill = 100 * 8 + 100 * 12 + (units - 200) * 16 

• Step4: Else If the units consumption is greater than 300, then the total electricity bill will be:
  

  Total Electricity Bill = 100 * 8 + 100 * 12 + 100 * 16 + (units - 300) * 20 

The given Java program is the implementation of the above logic.

// Java program to calculate the
// electricity bill
 
import java.util.*;
 
public class CalculateElectricityBill {
 
    // defining a function to calculate the
    // electricity bill
    // as per unit cost
    public static int calculateBill(int units)
    {
        int first_unit_cost = 8;
        int second_unit_cost = 12;
        int third_unit_cost = 16;
        int fourth_unit_cost = 20;
        
        if (units <= 100) {
            return units * first_unit_cost;
        }
        else if (units <= 200) {
            return (100 * first_unit_cost)
                + (units - 100)
                      * second_unit_cost;
        }
        else if (units <= 300) {
            return (100 * first_unit_cost)
                + (100 * second_unit_cost)
                + (units - 200)
                      * third_unit_cost;
        }
        else if (units > 300) {
            return (100 * first_unit_cost)
                + (100 * second_unit_cost)
                + (100 * third_unit_cost)
                + (units - 300)
                      * fourth_unit_cost;
        }
        return 0;
    }
 
    // Driver Code
    public static void main(String args[])
    {
        int units = 250;
        System.out.println("Total amount of "+ units +" units: ");
        System.out.println(
            calculateBill(units));
    }
}

Total amount of 250 units: 
2800

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