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Java toUpperCase Method

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The Java toUpperCase Method is one of the Java String Method which is used to convert the given string into Uppercase letters.

In this article we will show you, How to use String toUpperCase in Java Programming language with example. Before we get into the example, the basic syntax of the string.toUpperCase in Java Programming language is as shown below.

Java toUpperCase Method syntax

Java provides two different method to convert the specified string into Uppercase letters. Following method will not accept any parameters and convert all the characters in a string to uppercase using the rule of default locale.

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

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

Following function will accept Locale value as the parameter and convert all the characters in a string to uppercase using the user specified locale variable.

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

//In order to use in program
String_Object.toUpperCase(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 Uppercase. For example English, Turkish, Latin etc.

Java toUpperCase Method Example

The Java string toUpperCase method is used to convert the characters within a string to uppercase. This program will help you to understand the string toupperCase method.

package StringFunctions;

public class ToUpperCaseMethod {
 public static void main(String[] args) {
 String str = "Java ProgramminG Tutorial at Tutorial GateWay";
 
 String str1 = str.toUpperCase();
 String str2 = "Java Programming Language".toUpperCase();
 String str3 = "PRogramming WOrld".toUpperCase();
 String str4 = "TrY tO ReAd ThIs SenTEnCe".toUpperCase();
 
 System.out.println( "New Uppercase String = " + str1);
 System.out.println( "New Uppercase String = " + str2);
 System.out.println( "New Uppercase String = " + str3);
 System.out.println( "New Uppercase String = " + str4);
 }
}

OUTPUT

Java toUpperCase Method 1

ANALYSIS

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

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

The following statements will convert the convert the previously declared String into uppercase and assign it to Str1. Next, we used the toUpperCase method directly on string data

String str1 = str.toUpperCase();
String str2 = "Java Programming Language".toUpperCase();
String str3 = "PRogramming WOrld".toUpperCase();
String str4 = "TrY tO ReAd ThIs SenTEnCe".toUpperCase();

Following System.out.println statements will print the output

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