Java.lang.Character.isLetter() Method

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Description

The java.lang.Character.isLetter(int codePoint) determines if the specified character (Unicode code point) is a letter.

A character is considered to be a letter if its general category type, provided by getType(codePoint), 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(int codePoint)

Parameters

  • codePoint - the character (Unicode code point) 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 int primitives cp1, cp2
      int cp1, cp2;

      // assign values to cp1, cp2
      cp1 = 0x0065;
      cp2 = 0x007c;

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

      // check if cp1, cp2 represent letter and assign results to b1, b2
      b1 = Character.isLetter(cp1);
      b2 = Character.isLetter(cp2);

      String str1 = "Code point cp1 represents a letter is " + b1;
      String str2 = "Code point cp2 represents 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:

Code point cp1 represents a letter is true
Code point cp2 represents a letter is false



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