Java.lang.Character.isJavaIdentifierPart() Method



The java.lang.Character.isJavaIdentifierPart(int codePoint) determines if the character (Unicode code point) 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(codePoint) returns true for the character


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

public static boolean isJavaIdentifierPart(int codePoint)


codePoint − the character (Unicode code point) to be tested

Return Value

This method returns true if the character may be part of a Java identifier, false otherwise.




The following example shows the usage of lang.Character.isJavaIdentifierPart() 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 = 0x01f1;
      cp2 = 0x07c0;

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

       *  check if characters represented by cp1, cp2 can be part of
       *  java identifier and assign results to b1, b2
      b1 = Character.isJavaIdentifierPart(cp1);
      b2 = Character.isJavaIdentifierPart(cp2);

      String str1 = "cp1 may be part of a Java identifier is " + b1;
      String str2 = "cp2 may be part of a Java identifier 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 −

cp1 may be part of a Java identifier is true
cp2 may be part of a Java identifier is false