Java toUpperCase Method

The Java toUpperCase Method is one of the String Methods which helps convert the given string into Uppercase letters. This article will show how to use String toUpperCase with an example. The syntax of it is as shown below.

toUpperCase Syntax

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

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

//In order to use in program

The following toUpperCase Method function will accept the Locale value as the parameter and convert all the characters to uppercase using the user-specified locale variable.

public String toUpperCase(Locale locale);

//In order to use in program
String_Object.toUpperCase(Locale locale)
  • String_Object: Please specify the valid String Object.
  • locale: Please set 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 string toUpperCase method converts the characters to uppercase. This program will help to understand the same.

The first four statements will convert the previously declared String into uppercase and assign it to Str1. Next, we used the toUpperCase StringMethod directly on string data. And the following Java System.out.println statements will print the output.

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);
Java toUpperCase Method 1