java.lang.Character isJavaIdentifierPart(char ch)

Description

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

A character may be part of a Java identifier if any of the following are true:

  • it is a letter
  • it is a currency symbol (such as ‘$’)
  • 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 the character

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

The isJavaIdentifierPart(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.isJavaIdentifierPart(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 isJavaIdentifierPart() method non statically.

Method Syntax

public static boolean isJavaIdentifierPart(char ch)

Method Argument

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

Method Returns

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

Compatibility

Requires Java 1.1 and up

Java Character isJavaIdentifierPart(char ch) Example

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

package com.javatutorialhq.java.examples;

import java.util.Scanner;

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

public class CharacterIsJavaIdentifierPartCharExample {

	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 specified character may be part of a 
		 * Java identifier as other than the first character.
		 */

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

	}

}

Sample Output

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

java Character isJavaIdentifierPart(char ch) example output