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Java Character isLetter(int codePoint) Method

Java isJavaLetter(int codePoint) method is a part of Character class. This method is used to check whether the specified Unicode codepoint character is a letter or not.

A character is considered to be a letter if its general category type, provided by Character.getType(ch), is any of the following:


Not all letters have a case. Many characters are letters but are neither uppercase nor lowercase nor title case.


public static boolean isLetter(int codePoint)


The parameter passed is the Unicode codePoint character to be checked for letter.


Returns the boolean value true if the specified character is a letter else return false.

Example 1:

Here, the characters are checked whether they are a letter or not.

public class StudyTonight
	public static void main(String[] args)
		int cp1 = 48;  
		int cp2 = 61;  
		int cp3 = 119;  
		int cp4 = 90;   
		int cp5 = 1232;  

		boolean b1 = Character.isLetter(cp1);  
		boolean b2 = Character.isLetter(cp2);  
		boolean b3 = Character.isLetter(cp3);  
		boolean b4 = Character.isLetter(cp4);  
		boolean b5 = Character.isLetter(cp5);  

		System.out.println((char)cp1 +" is a letter??:  "+b1);  
		System.out.println((char)cp2 +" is a letter??:  "+b2);  
		System.out.println((char)cp3 +" is a letter??:  "+b3);  
		System.out.println((char)cp4 +" is a letter??:  "+b4);  
		System.out.println((char)cp5 +" is a letter??:  "+b5);  

0 is a letter??: false
= is a letter??: false
w is a letter??: true
Z is a letter??: true
? is a letter??: true

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent output.

import java.util.Scanner; 
public class StudyTonight
	public static void main(String[] args)
			System.out.print("Enter the Unicode character: ");  
			Scanner sc = new Scanner(;        
			int cp = sc.nextInt(); 
			boolean b = Character.isLetter(cp);
			System.out.println((char)cp + " is a  Letter?: "+b);
		catch(Exception e)
			System.out.println("Invalid Input!!");

Enter the Unicode character: 48
0 is a Letter?: false
Enter the Unicode character: 70
F is a Letter?: true

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.

About the author:
A Computer Science and Engineering Graduate(2016-2020) from JSSATE Noida. JAVA is Love. Sincerely Followed Sachin Tendulkar as a child, M S Dhoni as a teenager, and Virat Kohli as an adult.