Currency Conversion Program in Java

In this section of the java program tutorial, we will learn how to write a Java Currency Converter Program and see how it works. Before we begin, let me tell you that this is a beginner’s tutorial for the currency converter program in java.

Although there are many ways in which you can create a currency converter using java. You can create separate methods or you can use if..else-if statement, here we are going to use a switch case statement for the currency converter.

Java Currency Converter program using Switch case

import java.util.*;
import java.text.DecimalFormat;

public class CurrencyConverter
{
   public static void main(String[] args)
   {
      double amount;
      double rupee, dollar, pound, euro, yen, ringgit;
      int choice;

      DecimalFormat f = new DecimalFormat("##.##");

      Scanner sc = new Scanner(System.in);

      System.out.println("Following are the Choices:");
      System.out.println("Enter 1: Ruppe");
      System.out.println("Enter 2: Dollar");
      System.out.println("Enter 3: Pound");
      System.out.println("Enter 4: Euro");
      System.out.println("Enter 5: Yen");
      System.out.println("Enter 5: Ringgit");

      System.out.print("\nChoose from above options: ");
      choice = sc.nextInt();

      System.out.println("Enter the amount you want to convert?");
      amount = sc.nextFloat();

      switch (choice)
      {
         case 1:  // Ruppe Conversion
            dollar = amount / 70;
            System.out.println(amount + " Rupee = " + f.format(dollar) + " Dollar");

            pound = amount / 88;
            System.out.println(amount + " Rupee = " + f.format(pound) + " Pound");

            euro = amount / 80;
            System.out.println(amount + " Rupee = " + f.format(euro) + " Euro");

            yen = amount / 0.63;
            System.out.println(amount + " Rupee = " + f.format(yen) + " Yen");

            ringgit = amount / 16;
            System.out.println(amount + " Rupee = " + f.format(ringgit) + " ringgit");
            break;

         case 2:  // Dollar Conversion
            rupee = amount * 70;
            System.out.println(amount + " Dollar = " + f.format(rupee) + " Ruppes");

            pound = amount *0.78;
            System.out.println(amount + " Dollar = " + f.format(pound) + " Pound");

            euro = amount *0.87;
            System.out.println(amount + " Dollar = " + f.format(euro) + " Euro");

            yen = amount *111.087;
            System.out.println(amount + " Dollar = " + f.format(yen) + " Yen");

            ringgit = amount *4.17;
            System.out.println(amount + " Dollar = " + f.format(ringgit) + " ringgit");
            break;

         case 3:  // Pound Conversion
            rupee = amount * 88;
            System.out.println(amount + " pound = " + f.format(rupee) + " Ruppes");

            dollar = amount *1.26;
            System.out.println(amount + " pound = " + f.format(dollar) + " Dollar");

            euro = amount *1.10;
            System.out.println(amount + " pound = " + f.format(euro) + " Euro");

            yen = amount *140.93;
            System.out.println(amount + " pound = " + f.format(yen) + " Yen");

            ringgit = amount *5.29;
            System.out.println(amount + " pound = " + f.format(ringgit) + " ringgit");
            break;

         case 4:  // Euro Conversion
            rupee = amount * 80;
            System.out.println(amount + " euro = " + f.format(rupee) + " Ruppes");

            dollar = amount *1.14;
            System.out.println(amount + " euro = " + f.format(dollar) + " Dollar");

            pound = amount *0.90;
            System.out.println(amount + " euro = " + f.format(pound) + " Pound");

            yen = amount *127.32;
            System.out.println(amount + " euro = " + f.format(yen) + " Yen");

            ringgit = amount *4.78;
            System.out.println(amount + " euro = " + f.format(ringgit) + " ringgit");
            break;

         case 5:  // Yen Conversion
            rupee = amount *0.63;
            System.out.println(amount + " yen = " + f.format(rupee) + " Ruppes");

            dollar = amount *0.008;
            System.out.println(amount + " yen = " + f.format(dollar) + " Dollar");

            pound = amount *0.007;
            System.out.println(amount + " yen = " + f.format(pound) + " Pound");

            euro = amount *0.007;
            System.out.println(amount + " yen = " + f.format(euro) + " Euro");

            ringgit = amount *0.037;
            System.out.println(amount + " yen = " + f.format(ringgit) + " ringgit");
            break;

         case 6:  // Ringgit Conversion
            rupee = amount *16.8;
            System.out.println(amount + " ringgit = " + f.format(rupee) + " Ruppes");

            dollar = amount *0.239;
            System.out.println(amount + " ringgit = " + f.format(dollar) + " dollar");

            pound = amount *0.188;
            System.out.println(amount + " ringgit =: " + f.format(pound) + " pound");

            euro = amount *0.209;
            System.out.println(amount + " ringgit = " + f.format(euro) + " euro");

            yen = amount *26.63;
            System.out.println(amount + " ringgit = " + f.format(yen) + " yen");
            break;

          //Default case
         default:
            System.out.println("Invalid Input");
      }
   }
}

Output:

Following are the Choices:
Enter 1: Ruppe
Enter 2: Dollar
Enter 3: Pound
Enter 4: Euro
Enter 5: Yen
Enter 5: Ringgit

Choose from above options: 3
Enter the amount you want to convert?
200
200.0 pound = 17600 Ruppes
200.0 pound = 252 Dollar
200.0 pound = 220 Euro
200.0 pound = 28186 Yen
200.0 pound = 1058 ringgit

The above java program is the simple one as you can see that the conversion is done using the basic switch statement. And as told earlier, you can do the same by using the if..else-if ladder statement, or either you can create a separate function for each currency conversion. This is how you can create a basic currency converter in java program.