Java Program to Convert a String to a Currency Format

The NumberFormat and DecimalFromat class in Java offers a method for formatting numbers based on a location. We can define the formatting cultural conventions, such as the grouping separator, decimal separator, and currency symbol, using the locale parameter.

In Java, the NumberFormat class is used for currency formatting. To format numbers as currency, we need to follow these steps:

• Create an Instance: Use the NumberFormat.getCurrencyInstance() method to obtain a currency formatter instance.
• Set Locale: We can set the locale using locale to format the currency according to a specific region’s conventions.
• Format Numbers: Use the format() method to format the numerical values as currency. This method returns a formatted string representation of the provided number.

Program to Convert a String to a Currency Format in Java

There are certain approaches to convert string to a currency format in Java mentioned below:

Method 1: Using NumberFormat

Java

// Java program to convert a String to a currency format using number format
import java.util.*;
import java.math.BigDecimal;
import java.text.NumberFormat;

public class Main {

    public static void main(String[] args)
    {
           // String amount
        String str = "10000.58";

        // Get a Currency instance
        Currency inr = Currency.getInstance("INR");
        Currency usd = Currency.getInstance("USD");
        Currency eur = Currency.getInstance("EUR");
        // Local instance for India
        Locale loc = new Locale("hi", "IN");
        // Create a NumberFormatter with custom currency
        NumberFormat inrFormatter
            = NumberFormat.getCurrencyInstance(loc);
        inrFormatter.setCurrency(inr);
        NumberFormat usdFormatter
            = NumberFormat.getCurrencyInstance(Locale.US);
        usdFormatter.setCurrency(usd);
        NumberFormat eurFormatter
            = NumberFormat.getCurrencyInstance(Locale.UK);
        eurFormatter.setCurrency(eur);

        // Convert string to BigDecimal and format as
        // currency
        BigDecimal amt = new BigDecimal(str);
        String currInr = inrFormatter.format(amt);
        String currUs = usdFormatter.format(amt);
        String currUk = eurFormatter.format(amt);

        System.out.println("INR Currency: " + currInr);
        System.out.println("USD Currency: " + currUs);
        System.out.println("EUR Currency: " + currUk);
    }
}

Output

INR Currency: ₹10,000.58
USD Currency: $10,000.58
EUR Currency: €10,000.58

Explanation of the Program:

• In the above program, we have a string str representing the amount “10000.58”.
• We get instances of Currency for INR, USD, and EUR.
• We create NumberFormat instances for each currency with the respective locales and set the currency using setCurrency().
• We convert the string str to a BigDecimal object named amt.
• We use the format() method of each NumberFormat instance to format the BigDecimal amount as a currency string for each currency.
• Finally, we print the formatted currency strings to the console.

Method 2: Using DecimalFormat

Java

// Java program to convert a String to a currency format using decimal format
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {
        // String amount
        String str = "10000.58";

        // Create a DecimalFormat object
        DecimalFormat formatter
            = new DecimalFormat("$#,##0.00");

        // Convert string to BigDecimal and format as
        // currency
        BigDecimal amt = new BigDecimal(str);
        String currStr = formatter.format(amt);

        System.out.println("Currency: "
                           + currStr);
    }
}

Output

Currency: $10,000.58

Explanation of the Program:

• In the above program, we have a string str representing the amount “10000.58”.
• We have created a DecimalFormat object named formatter with the pattern "$#,##0.00", which specifies the currency format with two decimal places and commas for thousands of separators.
• We have converted the string str to a BigDecimal object named amt.
• We have used the format() method of the DecimalFormat object to format the BigDecimal amount as a currency string and store it in currStr.
• Finally, we print the formatted currency string to the console.