Java String toLowerCase​() Examples to convert string to lowercase


A quick guide to converting string to lowercase using the String API method toLowerCase​(). Example program on locale based lowercase conversion.

1. Introduction

In this article, You'll be learning how to convert each character in the string into a lower case.

This is very easy and can be done using String class toLowerCase() method which returns a new String after converting every character to the lowercase.

Java String toLowerCase​() Examples to convert string to lowercase

2. Java String toLowerCase​() Syntax

Below is the syntax from java api documentation.

public String toLowerCase​()
public String toLowerCase​(Locale locale)

This method does not take any argument but returns a new String with lowercase contents.

How to convert String to lowercase?

3. Java String toLowerCase​() Example - To convert String to Lowercase

package com.javaprogramto.w3schools.programs.string;

public class StringToLowercase {

    public static void main(String[] args) {

        String lowercaseStr = string.toLowerCase();

        System.out.println("Lowercase converted string : "+lowercaseStr);


Lowercase converted string : hello welcome to the javaprogramto.com

4. Java String toLowerCase​() Locale Examples

By default, toLowerCase() does conversion internally based on the default locale from the computer or server.


I have set the default locale as English in my machine so conversion is done for this locale;

But, if you want to for different locale then use the toLowerCase(Locale locale) overloaded method instead of the toLowerCase() method.

package com.javaprogramto.w3schools.programs.string;

import java.util.Locale;

public class StringToLowercase {

    public static void main(String[] args) {

        Locale defaultLocale = Locale.getDefault();
        System.out.println("Default locale : "+defaultLocale);

        String string = "I am Now Using the different locales";

        Locale french = Locale.forLanguageTag("co-FR");

        System.out.println("french loale : "+french);
        String lowercaseStr = string.toLowerCase(french);

        System.out.println("Lowercase converted string in French : "+lowercaseStr);

        Locale chineesLocale = new Locale("zh", "CN");

        String chineeslowerCase = string.toLowerCase(chineesLocale);
        System.out.println("Chinees locale string : "+chineeslowerCase);




Default locale : en_US

french loale : co_FR

Lowercase converted string in French : i am now using the different locales

Chinees locale string : i am now using the different locales

5. Java String toLowerCase​() Internal Implementation

public String toLowerCase() {
    return toLowerCase(Locale.getDefault());

public String toLowerCase(Locale locale) {
    return isLatin1() ? StringLatin1.toLowerCase(this, value, locale)
                      : StringUTF16.toLowerCase(this, value, locale);

6. Conclusion

In this article,  We've seen how to convert the string to lowercase with the default locale and with custom locale for specified country.

All examples showed are over GitHub.



About Us

Author: Venkatesh - I love to learn and share the technical stuff.

accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,18,Arrays,24,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,8,Collections,37,Collector,1,Command Line,1,Comparator,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,149,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,38,Dictionary,1,Difference,2,Download,1,Eclipse,3,Efficiently,1,Error,1,Errors,1,Exceptions,8,Fast,1,Files,17,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,9,Grant,1,Grep,1,HashMap,2,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,6,Iterate,2,Jackson API,3,Java,32,Java 10,1,Java 11,6,Java 12,5,Java 13,2,Java 14,2,Java 8,128,Java 8 Difference,2,Java 8 Stream Conversions,4,java 8 Stream Examples,12,Java 9,1,Java Conversions,14,Java Design Patterns,1,Java Files,1,Java Program,3,Java Programs,114,Java Spark,1,java.lang,4,java.util. function,1,JavaScript,1,jQuery,1,Kotlin,11,Kotlin Conversions,6,Kotlin Programs,10,Lambda,2,lang,29,Leap Year,1,live updates,1,LocalDate,1,Logging,1,Mac OS,3,Math,1,Matrix,6,Maven,1,Method References,1,Mockito,1,MongoDB,3,New Features,1,Operations,1,Optional,6,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,2,Sort,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Streams,31,String,61,String Programs,28,String Revese,1,StringBuilder,1,Swing,1,System,1,Tags,1,Threads,11,Tomcat,1,Tomcat 8,1,Troubleshoot,26,Unix,3,Updates,3,util,5,While Loop,1,
JavaProgramTo.com: Java String toLowerCase​() Examples to convert string to lowercase
Java String toLowerCase​() Examples to convert string to lowercase
A quick guide to converting string to lowercase using the String API method toLowerCase​(). Example program on locale based lowercase conversion.
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content