Calculating Monetary Values - Java Language Basics

Java examples for Language Basics:BigDecimal

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Solution 1

Use the BigDecimal data type to perform calculation on monetary values.

Format the resulting calculations using the NumberFormat.getCurrencyInstance() method.

Demo Code

import java.math.BigDecimal;
import java.text.NumberFormat;
import java.util.Locale;

public class Main {

  public static void main(String[] args) {
    BigDecimal currencyOne = new BigDecimal("25.65");
    BigDecimal currencyTwo = new BigDecimal("187.32");
    BigDecimal currencyThree = new BigDecimal("4.86");
    BigDecimal result = null;/*from w  w w  .  j av  a2s.  co  m*/
    String printFormat = null;

    // Add all three values
    result = currencyOne.add(currencyTwo).add(currencyThree);
    // Convert to double and send to formatDollars(), returning a String
    printFormat = formatDollars(result.doubleValue());
    System.out.println(printFormat);

    // Subtract the first currency value from the second
    result = currencyTwo.subtract(currencyOne);
    printFormat = formatDollars(result.doubleValue());
    System.out.println(printFormat);
  }

  /**
   * Formats a double value into currency format and then returns it as a String
   * 
   * @param value
   * @return
   */
  public static String formatDollars(double value) {
    NumberFormat dollarFormat = NumberFormat.getCurrencyInstance(Locale.US);
    return dollarFormat.format(value);
  }

}

Result

Solution 2

Utilize the Java Money API to perform monetary calculations. 

import javax.money.Monetary;
import javax.money.MonetaryAmount;
import javax.money.format.AmountFormatQuery;
import javax.money.format.MonetaryAmountFormat;
import javax.money.format.MonetaryFormats;
public class Main {
   
    public static void main(String[] args) {
        MonetaryAmount amount1 =  Money.of(25.65, Monetary.getCurrency("USD"));
        MonetaryAmount amount2 =  Money.of(187.32, Monetary.getCurrency("USD"));
        MonetaryAmount amount3 =  Money.of(4.86,Monetary.getCurrency("USD"));

        MonetaryAmount result = null;
        result = amount1.add(amount2).add(amount3);

        MonetaryAmountFormat printFormat = MonetaryFormats.getAmountFormat(
            AmountFormatQuery.of(Locale.US));
        System.out.println("Sum of all: " + printFormat.format(result));

        result = amount2.subtract(amount1);
        System.out.println("Subtract amount1 from amount 2: " + printFormat.format(result));
    }
}

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