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Devesh Harbola
Wrapper Character class.
1 Answer(s)      2 years and 5 months ago
Posted in : Java Beginners


How do the methods 'isIndentifierIgnorable(ch)' and 'isISOControl(ch)' work?? while workin with 'Character' wrapper class..please tag a code too...


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July 5, 2012 at 12:49 PM


isIndentifierIgnorable(ch) method: This method returns true if the character may be part of a Unicode identifier; false otherwise or you can say it determines if the specified character should be regarded as an ignorable character in a Java identifier or a Unicode identifier. The ignorable Unicode characters are control characters which are not whitespace:

from '\u0000') to '\u0008'

from '\u000E') to '\u001B'

from '\u007F' to '\u009F' The Join controls:

from '\u200C' to '\u200F'

Bidirectional controls:

from '\u202A' to '\u202E'

Format controls:

from '\u206A' to '\u206F'

Zero-width no-break space

'\uFEFF'

Example:

public class IsIdentifierIgnorableExample
{
    public static void main(String[] args)
    {
        // This char is not ignorable:
        System.out.println(Character.isIdentifierIgnorable('\u0009'));
        // This char is ignorable:
        System.out.println(Character.isIdentifierIgnorable('\u0007'));
    }
}

Output:
false
true

isISOControl(ch) method: This method returns true if the char is an ISO control character; false otherwise or you can say it determines if the specified character is an ISO control character. A character is considered to be an ISO control character if its code is in the range \u0000 through \u001F or in the range \u007F through \u009F.

public class IsISOControlExample
{
    public static void main(String[] args)
    {
        System.out.println(Character.isISOControl('\u008F'));
        System.out.println(Character.isISOControl('\u0000'));
        System.out.println(Character.isISOControl('\u010F'));
    }
}

Output:
true
true
false



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