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Java Character isIdentifierIgnorable(char ch) Method

Java isIdentifierIgnorable(char ch) method is a part of Character class. This method is used to check whether the specified 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(char ch) 

Parameters:

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

Returns:

Returns the boolean value true if the specified 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)
	{  
		char ch1 = 'g';  
		char ch2 = 'D';  
		char ch3 = '@';  
		char ch4  = 'e';   
		char ch5  = '8';  

		boolean b1 = Character.isIdentifierIgnorable(ch1);  
		boolean b2 = Character.isIdentifierIgnorable(ch2);  
		boolean b3 = Character.isIdentifierIgnorable(ch3);  
		boolean b4 = Character.isIdentifierIgnorable(ch4);  
		boolean b5 = Character.isIdentifierIgnorable(ch5);  

		System.out.println(ch1 +" is a ignorable?: "+b1);  
		System.out.println(ch2 +" is a ignorable?: "+b2);  
		System.out.println(ch3 +" is a ignorable?: "+b3);  
		System.out.println(ch4 +" is a ignorable?: "+b4);  
		System.out.println(ch5 +" is a ignorable?: "+b5);  
	}  
}  


g is a ignorable?: false
D is a ignorable?: false
@ is a ignorable?: false
e is a ignorable? : false
8 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 character: ");  
			Scanner sc = new Scanner(System.in);         
			char ch = sc.next().charAt(0);  
			boolean b = Character.isIdentifierIgnorable(ch);
			System.out.println(ch + " is a ignorable? : "+b);
		}
		catch(Exception e)
		{
			System.out.println("Invalid Input!!");
		}
	}  
}  


Enter the character: t
t is a ignorable? : false
*****************************
Enter the character: 2
2 is a ignorable? : false

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.