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Character.isIdentifierIgnorable() in Java with Examples

Last Updated : 06 Dec, 2018

1. The java.lang.Character.isIdentifierIgnorable(char ch) is an inbuilt method in java that determines if the specified character should be regarded as an ignorable character in a Java identifier or a Unicode identifier. The following Unicode characters are ignorable in a Java identifier or a Unicode identifier:
   • ISO control characters that are not whitespace
     1. '\u0000' through '\u0008'
     2. '\u000E' through '\u001B'
     3. '\u007F' through '\u009F'
   • all characters that have the FORMAT general category value
   Syntax:

   public static boolean isIdentifierIgnorable(char ch)

   Parameters: The parameter ch is of character datatype and refers to the character that is to be tested. Return Value: This method returns true if the character is an ignorable control character that may be part of a Java or Unicode identifier, false otherwise. Below programs illustrate the Character.isIdentifierIgnorable(char ch) method: Program 1: Java

   // Java program to illustrate
   // Character.isIdentifierIgnorable(char ch) method
   import java.lang.*;
   
   public class gfg {
   
      public static void main(String[] args) {
   
         // Creates 2 character primitives c1, c2 and assigning values
         char c1='\u0000', c2= '9';
   
         // Assigns isIdentifierIgnorable results of 
         // c1, c2 to boolean primitives
         boolean  bool1 = Character.isIdentifierIgnorable(c1);
         boolean  bool2 = Character.isIdentifierIgnorable(c2);
   
         String str1 = "c1 is an ignorable control character is " + bool1;
         String str2 = "c2 is an ignorable control character is " + bool2;
   
         System.out.println( str1 );
         System.out.println( str2 );
      }
   }
   

   Output:

   c1 is an ignorable control character is true
   c2 is an ignorable control character is false
   

   Program 2: Java

   import java.lang.*;
   
   public class gfg {
   
      public static void main(String[] args) {
   
         // Create 2 character primitives c1, c2 and assigning values
         char c1='\u000E', c2= '8';
   
         // Assigns isIdentifierIgnorable results of 
         // c1, c2 to boolean primitives
         boolean  bool1 = Character.isIdentifierIgnorable(c1);
         boolean  bool2 = Character.isIdentifierIgnorable(c2);
   
         String str1 = "c1 is an ignorable control character is " + bool1;
         String str2 = "c2 is an ignorable control character is " + bool2;
   
         System.out.println( str1 );
         System.out.println( str2 );
      }
   }
   

   Output:

   c1 is an ignorable control character is true
   c2 is an ignorable control character is false
   

2. The java.lang.Character.isIdentifierIgnorable(int codePoint) is similar to the previous method in all manner. Syntax:

   public static boolean isIdentifierIgnorable(int codePoint)
   

   Parameter: The function accepts a single parameter codePoint of integer datatype which specifies the character (Unicode code point) that is to be tested. Return value: This method returns true if the character is an ignorable control character that may be part of a Java or Unicode identifier, false otherwise. Below program illustrates the Character.isIdentifierIgnorable(int codepoint) method: Program 1: Java

   // Java program to demonstrate 
   // the Character.isIdentifierIgnorable(int codepoint) method
   
   import java.lang.*;
   
   public class gfg {
   
      public static void main(String[] args) {
   
         // Integer primitives c1, c2
         int c1 = 0x019f, c2 = 0x1abc;
   
         // Assign isIdentifierIgnorable results of cp1, cp2
         // to boolean primitives bool1, bool2
        boolean bool1 = Character.isIdentifierIgnorable(c1);
        boolean bool2 = Character.isIdentifierIgnorable(c2);
   
         // Print bool1, bool2 values
         System.out.println( "c1 is an ignorable control character?"+
         " ans is "+bool1);
         System.out.println( "c2 is an ignorable control character?"+
         " ans is "+bool2);
      }
   }
   

   Output:

   c1 is an ignorable control character? ans is false
   c2 is an ignorable control character? ans is false
   

   Program 2: Java

   // Java program to demonstrate 
   // the Character.isIdentifierIgnorable(int codepoint) method
   
   import java.lang.*;
   
   public class gfg {
   
      public static void main(String[] args) {
   
         // Integer primitives c1, c2
         int c1 = 0x119f, c2 = 0x0abc;
   
         // Assign isIdentifierIgnorable results of cp1, cp2
         // to boolean primitives bool1, bool2
        boolean bool1 = Character.isIdentifierIgnorable(c1);
        boolean bool2 = Character.isIdentifierIgnorable(c2);
   
         // Print bool1, bool2 values
         System.out.println( "c1 is an ignorable control character?"+
         " ans is "+bool1);
         System.out.println( "c2 is an ignorable control character?"+
         " ans is "+bool2);
      }
   }
   

   Output:

   c1 is an ignorable control character? ans is false
   c2 is an ignorable control character? ans is false
   

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