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Java Character isIdentifierIgnorable() Method

The isIdentifierIgnorable(int codePoint) method of Character class generally determines whether the specified character can be considered as an ignorable character in Java or a Unicode identifier.

The following characters are considered as ignorable characters in Java or Unicode identifier:

ISO control characters which do not have whitespace.
All the characters which are having FORMAT general category value.

Syntax

Parameter

The above method requires only one parameter:

a.)The codePoint which is the character that needs to be tested.

Return Value

The isIdentifierIgnorable(int codePoint) method returns a boolean value, i.e., true if the given(or specified) character is an ignorable control character that may be part of Java or Unicode identifier. Otherwise, this method returns false.

Example 1

public class JavaCharacterisIdentifierIgnorableintcodePointExample1 {
	public static void main(String[] args) {
	// Create three int primitives codePoint1, codePoint2 and codePoint3.
	int codePoint1, codePoint2, codePoint3;	
	// Assign the values to codePoint1, codePoint2 and codePoint3;
	codePoint1 = 0x008f;
	codePoint2 = 0x0abc;
	codePoint3 = 0x0a76;
// Create three boolean primitives b1, b2 and b3;
	boolean b1, b2, b3;
	// Assign the results of isIdentifierIgnorable of codePoint1, codePoint2 and codePoint3 to b1, b2and b3 respectively.
	b1 = Character.isIdentifierIgnorable(codePoint1);
	b2 = Character.isIdentifierIgnorable(codePoint2);
	b3 = Character.isIdentifierIgnorable(codePoint3);
System.out.println("The first codePoint is an ignorable control character is:  "+ b1);
System.out.println("The second codePoint is an ignorable control character is: "+ b2);
System.out.println("The third codePoint is an ignorable control character is:  "+ b3);
	   }
	}

Output:

The first codePoint is an ignorable control character is:  true
The second codePoint is an ignorable control character is: false
The third codePoint is an ignorable control character is:  false

Example 2

public class JavaCharacterisIdentifierIgnorableintcodePointExample2 {
public static void main(String[] args) {
	// Create the integer primitives c1 and c2 and assign the values to them.
	int c1 = 0x119f;
	int c2 = 0x0abc;
	// Create two boolean primitives b1 and b2.
	boolean b1 = Character.isIdentifierIgnorable(c1);
	boolean b2 = Character.isIdentifierIgnorable(c2); 
	// Print the values of b1 and b2.
System.out.println( "The first codePoint is an ignorable control character:  "  + b1);
System.out.println( "The second codePoint  is an ignorable control character: " + b2);
	   }
	}

Output:

The first codePoint is an ignorable control character:  false
The second codePoint  is an ignorable control character: false

Java Character isIdentifierIgnorable() Method

The isIdentifierIgnorable(char ch) method of Character class generally determines if the specified character can be considered as an ignorable character in Java or a Unicode identifier.

The following characters are considered as ignorable characters in Java or Unicode identifier:

ISO control characters which do not have whitespace.
All the characters which are having FORMAT general category value.

Note: The above method cannot be used to handle supplementary characters. In order to support all the Unicode characters, including the supplementary characters, we can use the isIdentifierIgnorable(int codePoint) method.

Syntax

Parameter

The above method requires only one parameter:

a.)The character which needs to be tested.

Return Value

The isIdentifierIgnorable(char ch) method returns a boolean value, i.e., true if the given(or specified) character is an ignorable control character and also which is a part of Java or Unicode identifier. Otherwise, this method returns false.

Example 3

public class JavaCharacterisIdentifierIgnorableExample3 {
public static void main(String[] args) {
	// Create three char primitives char1, char2 and char3.
	char char1, char2, char3;
	// Assign the values to char1, char2 and char3.
	char1 = 'A';
	char2 = 'B';
	char3 = 'C';
	// Create three boolean primitives b1, b2 and b3.
	boolean b1, b2, b3;
// Assign isIdentifierIgnorable results of char1, ch2 and ch3 to b1, b2 and b3 respectively.
	b1 = Character.isIdentifierIgnorable(char1);
	b2 = Character.isIdentifierIgnorable(char2);
	b3 = Character.isIdentifierIgnorable(char3);
String str1 = "The first character  'A' is an ignorable control character :  " + b1;
String str2 = "The second character 'B' is an ignorable control character : " + b2;
String str3 = "The third character 'C' is an ignorable control character : " + b3;
// Print the values of b1, b2 and b3.
	      System.out.println( str1 );
	      System.out.println( str2 );
	      System.out.println( str3 );
	   }
	}

Output:

The first character  'A' is an ignorable control character :  false
The second character 'B' is an ignorable control character : false
The third character  'C' is an ignorable control character :  false

Example 4

public class JavaCharacterisIdentifierIgnorableExample4 {
public static void main(String[] args) {
	// Create three char primitives char1, char2 and char3.
	char char1, char2, char3;
	// Assign the values to char1, char2 and char3.
	char1 = '1';
	char2 = '2';
	char3 = '3';
	// Create three boolean primitives b1, b2 and b3.
	boolean b1, b2, b3;
	// Assign isIdentifierIgnorable results of char1, ch2 and ch3 to b1, b2 and b3 respectively.
	b1 = Character.isIdentifierIgnorable(char1);
	b2 = Character.isIdentifierIgnorable(char2);
	b3 = Character.isIdentifierIgnorable(char3);
String str1 = "The first character  '1' is an ignorable control character :  " + b1;
String str2 = "The second character '2' is an ignorable control character :  " + b2;
String str3 = "The third character  '3' is an ignorable control character :  " + b3;       	// Print the values of b1, b2 and b3.
	      System.out.println( str1 );
	      System.out.println( str2 );
	      System.out.println( str3 );
	   }
	}

Output:

The first character  '1' is an ignorable control character :  false
The second character '2' is an ignorable control character :  false
The third character  '3' is an ignorable control character :  false

Example 5

import java.util.Scanner;
public class JavaCharacterisIdentifierIgnorableExample5 {
	public static void main(String[] args) {
	// Ask the user for the first input.
		System.out.print("Enter the first input of your choice:");
	// Use Scanner to get the input.
		Scanner obj1 = new Scanner(System.in);
		char[] value1 = obj1.nextLine().toCharArray();
// Get a value which indicates whether the given character is ignorable or not.
		for (char ch1 : value1) {
		boolean result1 = Character.isIdentifierIgnorable(ch1);		
System.out.println("The character '"+ ch1 +"' is an ignorable character : " + result1);			
	     }
	// Ask the user for the second input.
		System.out.print("Enter the second input of your choice:");
		Scanner obj2 = new Scanner(System.in);
		char[] value2 = obj1.nextLine().toCharArray();
		for (char ch2 : value2) {
		boolean result2 = Character.isIdentifierIgnorable(ch2); System.out.println("The character '"+ ch2 +"' is an ignorable character : " + result2);			
	  }
     }
  }

Output:

Enter the first input of your choice:G
The character 'G' is an ignorable character : false
Enter the second input of your choice:#
The character '#' is an ignorable character : false

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