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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.

Syntax:

public static boolean isIdentifierIgnorable(int codePoint) 

Parameters:

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

Returns:

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)
	{  
		try
		{
			System.out.print("Enter the codepoint: ");  
			Scanner sc = new Scanner(System.in);         
			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.