Converting Characters to Uppercase with toUpperCase() Method in Java: A Comprehensive Guide

Description

The Character.toUpperCase(char ch) java method converts the character argument to uppercase using case mapping information from the UnicodeData file.

Note that Character.isUpperCase(Character.toUpperCase(ch)) does not always return true for some ranges of characters, particularly those that are symbols or ideographs.

In general, String.toUpperCase() should be used to map characters to uppercase. String case mapping methods have several benefits over Character case mapping methods. String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas the Character case mapping methods cannot.

toUpperCase(char ch) returns the uppercase form of the specified char value.

Method Syntax

public static char toTitleCase(char ch)

Method Argument

Method Returns

The toUpperCase(char ch) method of Character class returns the uppercase equivalent of the character, if any; otherwise, the character itself.

Compatibility

Requires Java 1.0 and up

Java Character toUpperCase(char ch) Example

Below is a simple java example on the usage of toUpperCase(char ch) method of Character class.

public class MethodtoUpperCase {

   public static void main(String args[]) {
      System.out.println(Character.toUpperCase('s'));
      System.out.println(Character.toUpperCase('S'));
   }
}

output

Below is the sample output when you run the above example.

S
S
Press any key to continue . . .

Java Character toUpperCase(char ch) Example

Below is a simple java example on the usage of toUpperCase(char ch) method of Character class.

import java.util.Scanner;

/*
 * This example source code demonstrates the use of
 * toUpperCase(char ch) method of Character class.
 */

public class CharacterToUpperCaseChar  {

	public static void main(String[] args) {

		// Ask for user input
		System.out.print("Enter an input:");

		// use scanner to get the user input
		Scanner s = new Scanner(System.in);

		// get a single character
		char[] value = s.nextLine().toCharArray();
  
		// convert user input to upper case
		for(char ch:value){
			char chUpper = Character.toUpperCase(ch);
			// print the result
			System.out.println("character "+ch +" Upper case is " +chUpper);
		}

	}

}

output

Below is the sample output when you run the above example.

Enter an input:s
character s Upper case is S
Press any key to continue . . .