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.

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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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Java String toLowerCase() with examples