Java String toLowerCase() Method

Last Updated : 23 Dec, 2024

Java String toLowerCase() method is used to convert all letters to lowercase in a given string.

Example:

Java

import java.util.*;   class Geeks  {  	public static void main(String args[])      {  		// Custom input string  		String s = "Geeks for Geeks";   		// Converting string s to lowercase letter  		String s2 = s.toLowerCase();   		System.out.println(s2);  	}  }

Output

geeks for geeks

Syntax of toLowerCase()

public String toLowerCase ()

Return Value : Returns a string in lowercase letter.

Internal Working of toLowerCase()

The Locale class is part of java.util package. It is used for extracting and manipulating the information. Locale object represents a geographical, political, or cultural region.

The package view of the method is as follows:

--> java.util Package
--> String Class
--> toLowerCase() Method

Example Statement

// Creates a Locale for the English language
Locale locale1 = new Locale("en");

It plays a vital role in toLowerCase() conversion where it checks the elements and helps to convert them into Lower Case. To know more about the topic refer to Locale article.

Note: Internally toLowerCase() works in similar way as toLowerCase(Locale.getDefault()) method.

Java toLowerCase(Locale loc)

Converts all the characters into lowercase using the rules of the given Locale.

Syntax of toLowerCase()

public String toLowerCase (Locale loc)

Parameters: Locale value to be applied.
Return Value: Returns a string in lowercase letter.

Example:

Java

// Working of toLowerCase() Method  // present inside Locale class import java.util.Locale;  class Geeks {        public static void main(String args[]) {               String s = "I Know YOI Bui You Don't Know ME";          // Locales with the language "tr" for TURKISH         //"en" for ENGLISH is created         Locale TURKISH = Locale.forLanguageTag("tr");         Locale ENGLISH = Locale.forLanguageTag("en");          // Converting string s to lowercase letter         // using TURKISH and ENGLISH language         String str1 = s.toLowerCase(TURKISH);         String str2 = s.toLowerCase(ENGLISH);          System.out.println(str1);         System.out.println(str2);     } }

Output

ı know yoı bui you don't know me i know yoi bui you don't know me

Java String toLowerCase() Method

Niraj_Pandey

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Java String toLowerCase() Method

Example:

Syntax of toLowerCase()

Internal Working of toLowerCase()

Java toLowerCase(Locale loc)

Syntax of toLowerCase()

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