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Java Character isIdentifierIgnorable(int codePoint) Method

Java isIdentifierIgnorable(int codePoint) method is a part of Character class. This method is used to check whether the specified Unicode codepoint character can be considered as an ignorable character in Java or a Unicode identifier or not.

The characters which are considered as ignorable characters or Unicode identifier are:

  • ISO control characters that are not whitespace.
    • '\u0000' through '\u0008'
    • '\u000E' through '\u001B'
    • '\u007F' through '\u009F'
  • all characters that have the FORMAT general category value.


public static boolean isIdentifierIgnorable(int codePoint) 


The parameter passed is the Unicode codepoint character to be checked for the ignorable character.


Returns the boolean value true if the specified Unicode codepoint character is an ignorable character else return false.

Example 1:

Here, the characters are checked whether they are ignorable characters or not.

public class StudyTonight
	public static void main(String[] args)
		int cp1 = 0x008f;  
		int cp2 = 0x004f;  
		int cp3 = 50;  
		int cp4  = 83;   
		int cp5  = 55;  

		boolean b1 = Character.isIdentifierIgnorable(cp1);  
		boolean b2 = Character.isIdentifierIgnorable(cp2);  
		boolean b3 = Character.isIdentifierIgnorable(cp3);  
		boolean b4 = Character.isIdentifierIgnorable(cp4);  
		boolean b5 = Character.isIdentifierIgnorable(cp5);  

		System.out.println((char)cp1 +" is a ignorable?:  "+b1);  
		System.out.println((char)cp2 +" is a ignorable?:  "+b2);  
		System.out.println((char)cp3 +" is a ignorable?:  "+b3);  
		System.out.println((char)cp4 +" is a ignorable? : "+b4);  
		System.out.println((char)cp5 +" is a ignorable?:  "+b5);  

 is a ignorable?: true
O is a ignorable?: false
2 is a ignorable?: false
S is a ignorable? : false
7 is a ignorable?: false

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent output.

import java.util.Scanner; 
public class StudyTonight
	public static void main(String[] args)
			System.out.print("Enter the codepoint: ");  
			Scanner sc = new Scanner(;         
			int cp = sc.nextInt();  
			boolean b = Character.isIdentifierIgnorable(cp);
			System.out.println((char)cp + " is a ignorable? : "+b);
		catch(Exception e)
			System.out.println("Invalid Input!!");

Enter the codepoint: 787
? is a ignorable? : false
Enter the codepoint: 0x565
Invalid Input!!

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.

About the author:
A Computer Science and Engineering Graduate(2016-2020) from JSSATE Noida. JAVA is Love. Sincerely Followed Sachin Tendulkar as a child, M S Dhoni as a teenager, and Virat Kohli as an adult.