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One of those java features I should have known: class.isInstance()

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Chris Winters

Posts: 931
Nickname: cwinters
Registered: Jul, 2003

Daytime: Java hacker; nighttime: Perl hacker; sleeptime: some of both.

One of those java features I should have known: class.isInstance()

Posted: Jun 21, 2005 7:52 AM

This post originated from an RSS feed registered with Java Buzz by Chris Winters.
Original Post: One of those java features I should have known: class.isInstance() Feed Title: cwinters.com Feed URL: http://www.cwinters.com/search/registrar.php?domain=jroller.com®istrar=sedopark Feed Description: Chris Winters on Java, programming and technology, usually in that order.	Latest Java Buzz Posts Latest Java Buzz Posts by Chris Winters Latest Posts From cwinters.com

One of the few times I've written a piece of functionality and actually found it later: the isInstance() method of the Class class. It's useful when you're dealing with generic classes and therefore cannot use instanceof:

void ensureAllHaveParent( Collection c, Class parentClass ) {
    for ( Iterator it = c.iterator(); it.hasNext(); ) {
        Object o = it.next();
        if ( ! ( o instanceof parentClass ) ) ... // WRONG!
        if ( ! parentClass.isInstance( o ) )  ... // RIGHT!
    }
}

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