RE: [OT] [Reflection/Classes] doing something like instanceof at runtime
Ah. Cheers mate!
I reckon thats just what Im looking for. :-)
-Original Message-
From: Daniel H. F. e Silva [mailto:[EMAIL PROTECTED]
Sent: Wednesday, 8 October 2003 19:58
To: Struts Users Mailing List; [EMAIL PROTECTED]
Subject: Re: [OT] [Reflection/Classes] doing something like instanceof
at runtime
Andrew,
I don't know if this is the best way, but you can try something like that:
boolean isInstanceOf(Object o, String klass) {
Class c = null;
try {
c = Class.forName(klass);
} catch (ClassNotFoundException e) {
// TODO
}
return c.isInstance(o);
}
Regards,
Daniel.
--- Andrew Hill <[EMAIL PROTECTED]> wrote:
> I want to be able to check if an object is an instance or a subclass of a
> specified class - where that class is specified in a string that is only
> known at runtime.
> For example to have the following code print out "bobs got a date":
>
> boolean isInstanceof(Object o, String klass)
> {
> //TODO
> }
>
> java.sql.Timestamp bob = new java.sql.Timestamp(0);
> if( isInstanceof( bob, "java.util.Date" ) )
> {
> System.out.println("bobs got a date");
> }
>
>
> One idea that occured to me was to get the classname of bob, and test
> against the string, and if that didnt match, to get the classname of that
> classes superclass ( and test that and so on, but Im wondering if there
> exists a more efficient technique...
>
>
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>
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Re: [OT] [Reflection/Classes] doing something like instanceof at runtime
Andrew,
I don't know if this is the best way, but you can try something like that:
boolean isInstanceOf(Object o, String klass) {
Class c = null;
try {
c = Class.forName(klass);
} catch (ClassNotFoundException e) {
// TODO
}
return c.isInstance(o);
}
Regards,
Daniel.
--- Andrew Hill <[EMAIL PROTECTED]> wrote:
> I want to be able to check if an object is an instance or a subclass of a
> specified class - where that class is specified in a string that is only
> known at runtime.
> For example to have the following code print out "bobs got a date":
>
> boolean isInstanceof(Object o, String klass)
> {
> //TODO
> }
>
> java.sql.Timestamp bob = new java.sql.Timestamp(0);
> if( isInstanceof( bob, "java.util.Date" ) )
> {
> System.out.println("bobs got a date");
> }
>
>
> One idea that occured to me was to get the classname of bob, and test
> against the string, and if that didnt match, to get the classname of that
> classes superclass ( and test that and so on, but Im wondering if there
> exists a more efficient technique...
>
>
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>
__
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The New Yahoo! Shopping - with improved product search
http://shopping.yahoo.com
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To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
[OT] [Reflection/Classes] doing something like instanceof at runtime
I want to be able to check if an object is an instance or a subclass of a
specified class - where that class is specified in a string that is only
known at runtime.
For example to have the following code print out "bobs got a date":
boolean isInstanceof(Object o, String klass)
{
//TODO
}
java.sql.Timestamp bob = new java.sql.Timestamp(0);
if( isInstanceof( bob, "java.util.Date" ) )
{
System.out.println("bobs got a date");
}
One idea that occured to me was to get the classname of bob, and test
against the string, and if that didnt match, to get the classname of that
classes superclass ( and test that and so on, but Im wondering if there
exists a more efficient technique...
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
