Simple Interest Program in Java using Methods | Inheritance

Simple interest program in java using methods and inheritance.

In this article, you will learn how to make a simple interest program in java using methods and inheritance.

 

Example

 

You should have the knowledge of the following topics in java programming to understand these programs:

• Java java.util.Scanner package
• Java main() method
• Java Methods
• Java Inheritance

 

Simple Interest Formula in Java

SI = (P * T * R) / 100

 

Where

 

In this article, we solve this problem in three methods:

1. Using the normal calculation
2. Using the Methods
3. Using the Inheritance
4. Using the Constructor

Source Code

// Simple Interest Program in Java
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        System.out.println("Enter the principal (amount), time, and rate::\n");

        float p = in.nextFloat(); // value of the principal
        float t = in.nextFloat(); // value of the time
        float r = in.nextFloat(); // value of the rate
        float SI; // value of the simple interest

        // It will calculate the simple interest
        SI = (p * t * r) / 100;

        // It will produce the final output
        System.out.println("\nSimple Interest = " + SI);
    }
}

Run Program

Output

 

Explanation

In this given program, we have taken inputs Amount, Time, and Rate amount following: 5, 7, and 9 from the user via the system console. Then we applied the standard formula to calculate simple interest.

Then this program will return the 3.15 simple interest value of the above calculation.

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Simple Interest Program in Java using Methods

// Simple Interest Program in Java using Methods
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        System.out.println("Enter the principal (amount), time, and rate::\n");

        float p = in.nextFloat(); // value of the principal
        float t = in.nextFloat(); // value of the time
        float r = in.nextFloat(); // value of the rate

        CalculateSimpleInterest(p, t, r);
    }

    // This method will calculate the simple interest
    public static void CalculateSimpleInterest(float x, float y, float z) {
        float SI; // Value of the simple interest

        // It will calculate the simple interest
        SI = (x * y * z) / 100;

        // It will produce the final output
        System.out.println("\nSimple Interest = " + SI);
    }
}

Run Program

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Simple Interest Program in Java using Inheritance

// Simple Interest Program in Java using Inheritance
import java.util.Scanner;

// This class will calculate the simple interest
class CalcSimpleInterest {
    public float CalculateInterest(float x, float y, float z) {
        return (x * y * z) / 100;
    }
}

// This class will inherit `CalcSimpleInterest` class and print the simple interest
class PrintSimpleInterest extends CalcSimpleInterest {
    public void PrintInterest(float SI) {
        System.out.println("\nSimple Interest = " + SI);
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        System.out.println("Enter the principal (amount), time, and rate::");

        float p = in.nextFloat(); // value of the principal
        float t = in.nextFloat(); // value of the time
        float r = in.nextFloat(); // value of the rate
        
        PrintSimpleInterest SimpleInterest = new PrintSimpleInterest();

        // It will calculate the simple interest
        float SI = SimpleInterest.CalculateInterest(p, t, r);

        // It will produce the final output
        SimpleInterest.PrintInterest(SI);
    }
}

Run Program

Output

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Simple Interest Program in Java using Constructor

// Simple Interest Program in Java using Constructor
import java.util.Scanner;

// It's the main constructor class
public class Main {

    Main() { }

    void CalculateSimpleInterest(float a, float b, float c) {
        float SI; // value of the simple interest

        // It will calculate the simple interest
        SI = (a * b * c) / 100;

        System.out.println("\nSimple Interest = " + SI);
    }
}

class MainClass {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        Main M = new Main();

        System.out.println("Enter the principal (amount), time, and rate::\n");

        float p = in.nextFloat(); // value of the principal
        float t = in.nextFloat(); // value of the time
        float r = in.nextFloat(); // value of the rate

        // It will produce the final output
        M.CalculateSimpleInterest(p, t, r);
    }
}

 

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