java.lang.Character isJavaIdentifierPart(int codePoint)


The Character.isJavaIdentifierPart(int codePoint) 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

The isJavaIdentifierPart(int codePoint) 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(int codePoint)

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(int codePoint)

Method Argument

Data Type Parameter Description
int codePoint the character (Unicode code point) 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.


Requires Java 1.5 and up

Java Character isJavaIdentifierPart(int codePoint) Example

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


 * This example source code demonstrates the use of 
 * isJavaIdentifierStart(int codePoint) method of Character class.

public class CharacterIsJavaIdentifierPartCodepointExample {

	public static void main(String[] args) {
		// initialize a codepoint
		int codepoint = 89;		

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

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


Sample Output

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

java Character isJavaIdentifierPart(int codePoint) example output