Checking for Uppercase Characters with isUpperCase() Method in Java: A Comprehensive Guide

Description

The Character.isUpperCase(char ch) java method determines if the specified character is an uppercase character. A character is uppercase if its general category type, provided by Character.getType(ch), is UPPERCASE_LETTER. or it has contributory property Other_Uppercase as defined by the Unicode Standard.

 

This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the isUpperCase(int) method.

This method determines whether the specified char value is uppercase.

Method Syntax

public static boolean isUpperCase(char ch)

Method Argument

Data Type	Parameter	Description
char	ch	the character to be tested. Primitive character type.

Method Returns

The isUpperCase(char ch) method of Character class returns true if the character is uppercase; false otherwise.

Compatibility

Requires Java 1.0 and up

Example

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

public class MethodisUpperCase {

   public static void main(String args[]) {
      System.out.println(Character.isUpperCase('s'));
      System.out.println(Character.isUpperCase('S'));
      System.out.println(Character.isUpperCase('\n'));
      System.out.println(Character.isUpperCase('\t'));
   }
}

output

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

false
true
false
false
Press any key to continue . . .

Java Character isUpperCase(char ch) Example

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

import java.util.Scanner;

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

public class CharacterIsUpperCaseChar  {

	public static void main(String[] args) {


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

		// use scanner to get the user input
		Scanner s = new Scanner(System.in);
		// get a single character
		char value = s.nextLine().toCharArray()[0];

		// close the scanner object
		s.close();

		// check if the user input is upper case or not
		boolean checkBool = Character.isUpperCase(value);
		// print result
		if(checkBool){
			System.out.println("User input \'"+value+"\' is Upper case");
		}
		else{
			System.out.println("User input \'"+value+"\' is not Upper case");
		}

	}

}

output

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

Enter a character:s
User input 's' is not Upper case
Press any key to continue . . .


Enter a character:S
User input 'S' is Upper case
Press any key to continue . . .