java.lang.Character isUnicodeIdentifierPart(char ch)


The Character.isUnicodeIdentifierPart(char ch) java method determines if the specified character may be part of a Unicode identifier as other than the first character.

A character may be part of a Unicode identifier if and only if one of the following statements is true:

  • it is a letter
  • it is a connecting punctuation character (such as ‘_’)
  • it is a digit
  • it is a numeric letter (such as a Roman numeral character)
  • it is a combining mark
  • it is a non-spacing mark
  • isIdentifierIgnorable returns true for this character.

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

The isUnicodeIdentifierPart(char ch) method of Character class is static thus it should be accessed statically which means the we would be calling this method in this format:

Character.isUnicodeIdentifierPart(char ch)

Non static method is usually called by just declaring method_name(argument) however in this case since the method is static, it should be called by appending the class name as suffix. We will be encountering a compilation problem if we call the java isUnicodeIdentifierPart() method non statically.

Method Syntax

public static boolean isUnicodeIdentifierPart(char ch)

Method Argument

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

Method Returns

The isUnicodeIdentifierPart(char ch) method of Character class returns true if the character may be part of a Unicode identifier; false otherwise.


Requires Java 1.1 and up

Java Character isUnicodeIdentifierPart(char ch) Example

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


import java.util.Scanner;

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

public class CharacterIsUnicodeIdentifierPartCharExample {

	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(;

		// get a single character
		char value = s.nextLine().toCharArray()[0];

		// close the scanner object

		 * check if the specified character is permissible as 
		 * part of a Unicode identifier.

		boolean checkBool = Character.isUnicodeIdentifierPart(value);
		// print result
		if (checkBool) {
			System.out.print("User input '" + value + "' is permissible as part "
					+ "of a Unicode identifier");
		} else {
			System.out.print("User input '" + value + "' is not permissible as part "
					+ "of a Unicode identifier");



Sample Output

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

java Character isUnicodeIdentifierPart(char ch) example output