Java String toLowerCase() Method

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

Example:

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: