Java String toLowerCase() usage and example

Java String (String) Methods

The Java String toLowerCase() method converts all characters in the string to lowercase.

The syntax of the string toLowerCase() method is:

string.toLowerCase()

toLowerCase() parameters

• Without any parameters

toLowerCase() return value

• Returns a string with all uppercase letters converted to lowercase letters

Example: Java toLowerCase()

class Main {
　　public static void main(String[] args) {
　　　　String str1　= "Learn Java";
　　　　String str2　= "Java123";
　　　　//converted to lowercase letters
　　　　System.out.println(str1.toLowerCase());　//　"learn java"
　　　　System.out.println(str2.toLowerCase());　//　"java123"
　　}
}

From the above examples, you can see that toLowerCase() converts all uppercase letters to lowercase letters.

toLowerCase() with Locale Parameter

The toLowerCase() method can also use the locale as a parameter. This allows you to use the rules of the given locale settings (such as Turkish, Lithuanian, etc.) to convert characters in the string to lowercase.

The syntax is:

string.toLowerCase(Locale locale)

If the locale parameter is not passed, the default locale Locale.getDefault() is used.

To convert all characters in a string to uppercase, useJava String toUpperCase() Method.

Java String (String) Methods