Java Parse String to Number using NumberFormat class

Tags: java.text.NumberFormat Java Parse Number

In this Java tutorial we learn how to convert a String value into Number value using java.text.NumberFormat class.

Table of contents

  1. How to use java.text.NumberFormat to Parse String to Number
  2. Parse String to Number with a Specified Locale

How to use java.text.NumberFormat to Parse String to Number

To use the NumberFormat class we need to get the instance of it using the NumberFormat.getInstance() method as the following Java program.

ParseNumberExample1.java 

import java.text.NumberFormat;
import java.text.ParseException;

public class ParseNumberExample1 {
    public static void main(String... args) throws ParseException {
        NumberFormat numberFormat = NumberFormat.getInstance();

        Number number = numberFormat.parse("123,456.7");

        System.out.println(number);
    }
}
The output as below. 
123456.7

Parse String to Number with a Specified Locale

NumberFormat also allow to parse a String in a specified Locale format. In order to do that we can get instance of NumberFormat with a given Locale as below.

ParseNumberExample2.java 

import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;

public class ParseNumberExample2 {
    public static void main(String... args) throws ParseException {
        NumberFormat numberFormat = NumberFormat.getInstance(Locale.GERMANY);

        Number number = numberFormat.parse("123.456,7");

        System.out.println(number);
    }
}
The output as below. 
123456.7

The following example to show how to get instance of NumberFormat with specified language and country of Locale.

ParseNumberExample3.java 

import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;

public class ParseNumberExample3 {
    public static void main(String... args) {
        NumberFormat numberFormat = NumberFormat.getInstance(new Locale("da", "DK"));

        Number number = null;
        try {
            number = numberFormat.parse("123.456,7");
        } catch (ParseException e) {
            e.printStackTrace();
        }

        System.out.println(number);
    }
}
The output as below. 
123456.7

Happy Coding 😊

Java Format Number using NumberFormat class