Java String toLowerCase() with examples

Difficulty Level : Basic
Last Updated : 04 Dec, 2018

The java string toLowerCase() method converts all characters of the string into lowercase letter. There are two types of toLowerCase() method.

Signature:

public String toLowerCase(Locale loc) 
and
public String toLowerCase() 
Parameter:
loc- locale value to be applied. converts all the characters into 
lowercase using the rules of given Locale.  
Returns: returns string in lowercase letter.

// Java program to demonstrate 
// working of toLowerCase() method 
  
class Gfg { 
    public static void main(String args[]) 
    { 
        String s = "Welcome! to Geeksforgeeks Planet."; 
  
        // converting string s to lowercase letter 
        String gfg1 = s.toLowerCase(); 
        System.out.println(gfg1); 
    } 
} 

Output:

welcome! to geeksforgeeks planet.

// Java program to demonstrate 
// working of Locale class in 
// toLowerCase() method 
import java.util.Locale; 
class Gfg { 
    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 gfg2 = s.toLowerCase(TURKISH); 
        String gfg3 = s.toLowerCase(ENGLISH); 
        System.out.println(gfg2); 
        System.out.println(gfg3); 
    } 
} 

Output:

? know yo? bui you don't know me.
i know yoi bui you don't know me.

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