Java: How should look an instanceof method

Question

Imagine, I want to write a useless method called: isInstanceof that returns a boolean.
I was thinking about it. But I do not get out. An instanceof has to be used like:

[object] instanceof [a classname]

// I was thinking about something like this
public static boolean isInstanceof(Object obj, /*magic for the second param*/)
{
   return obj instanceof /*the magical second param*/
}

But how can I make an parameter for [a classname]? Is there a way to do this without the method isInstance(Class cls) from java.lang.Class?

Thanks

Bombe · Accepted Answer · 2009-12-17 09:27:09Z

5

Hehe, yes. Use isAssignableFrom(Class) from Class. Not only is it not isInstance(Class), it also matches the way the instanceof operator works more closely. :)

Other than that, no, there’s not much you can do without those methods from Class.

edited Dec 17, 2009 at 9:27

answered Dec 17, 2009 at 8:49

Bombe

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1 Comment

Martijn Courteaux Over a year ago

Thanks, your last sequence was the one I was looking for.

skaffman · Accepted Answer · 2009-12-17 08:54:55Z

2

A dynamic version of

[object] instanceof [a classname]

would be:

Class.forName("a classname").isAssignableFrom(object.getClass());

answered Dec 17, 2009 at 8:54

skaffman

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