Java toLowerCase Method

The Java toLowerCase Method is one of the String Method which is used to convert the given string into Lowercase letters. In this article we will show you, How to use String toLowerCase in Java Programming with example.

Before we get into the example, the basic syntax of the string.toLowerCase in Java is as shown below. The Java Programming provides two different method to convert the specified string into Lowercase letters.

The following Java toLowerCase function will not accept any parameters and convert all the characters in a specified string to lowercase using the rule of default locale.

public String toLowerCase(); // It will return String 

//In order to use in program
String_Object.toLowerCase()

The following function will accept Locale value as the parameter and convert the characters in a string to lowercase using the user specified locale.

public String toLowerCase(Locale locale); // It will return String 

//In order to use in program
String_Object.toLowerCase(Locale locale)

• String_Object: Please specify the valid String Object.
• locale: Please specify the Locale you want to use while converting the String_Object characters to Lowercase. For example, English, Turkish, Latin etc.

Java toLowerCase Method Example

The Java string toLowerCase method is used to convert all the characters in a string to lowercase. This program will help you to understand the string.toLowerCase method.

package StringFunctions;

public class ToLowerCaseMethod {
	public static void main(String[] args) {
		String str = "Free Java Tutorial at Tutorial GateWay";
		
		String str1 = str.toLowerCase();
		String str2 = "TUTORIAL GATEWAY".toLowerCase();
		String str3 = "JAVA TUTOIRIAL".toLowerCase();
		String str4 = "TrY tO ReAd ThIs SenTEnCe".toLowerCase();
		
		System.out.println( "New Lowercase String = " + str1);
		System.out.println( "New Lowercase String = " + str2);
		System.out.println( "New Lowercase String = " + str3);
		System.out.println( "New Lowercase String = " + str4);
	}
}

OUTPUT

ANALYSIS

First we declared the String variable and assigned a value using following statement

String str = "Free Java Tutorial at Tutorial GateWay";

Following statements will convert the convert the previously declared String data to lowercase characters and assign it to Str1. Next, we used the toLowerCase method directly on string data

String str1 = str.toLowerCase();
String str2 = "TUTORIAL GATEWAY".toLowerCase();
String str3 = "JAVA TUTOIRIAL".toLowerCase();
String str4 = "TrY tO ReAd ThIs SenTEnCe".toLowerCase();

Following System.out.println statements will print the output

System.out.println( "New Lowercase String = " + str1);
System.out.println( "New Lowercase String = " + str2);
System.out.println( "New Lowercase String = " + str3);
System.out.println( "New Lowercase String = " + str4);

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