Java.lang.Character.isLetter() Method

Description

The java.lang.Character.isLetter(char ch) determines if the specified character is a letter.

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

• UPPERCASE_LETTER

• LOWERCASE_LETTER

• TITLECASE_LETTER

• MODIFIER_LETTER

• OTHER_LETTER

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

Declaration

Following is the declaration for java.lang.Character.isLetter() method

public static boolean isLetter(char ch)

Parameters

• ch - the character to be tested

Return Value

This method returns true if the character is a letter, false otherwise.

Exception

• NA

Example

The following example shows the usage of lang.Character.isLetter() method.

package com.tutorialspoint;

import java.lang.*;

public class CharacterDemo {

   public static void main(String[] args) {

      // create 2 char primitives ch1, ch2
      char ch1, ch2;

      // assign values to ch1, ch2
      ch1 = 'A';
      ch2 = '9';

      // create 2 boolean primitives b1, b2
      boolean b1, b2;

      // check if ch1, ch2 are letter or not and assign results to b1, b2
      b1 = Character.isLetter(ch1);
      b2 = Character.isLetter(ch2);

      String str1 = ch1 + " is a letter is " + b1;
      String str2 = ch2 + " is a letter is " + b2;

      // print b1, b2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

Let us compile and run the above program, this will produce the following result:

A is a letter is true
9 is a letter is false