How to Find the generic type of a class and cast a value to that type?

Asked May 11 '18 at 08:13

Active May 11 '18 at 08:31

Viewed 44 times

In a third-party code there is the following function:

public <F extends OFValueType<F>> Builder setExact(MatchField<F> field, F value) throws UnsupportedOperationException;

Now, given a MatchField<F> field variable, how can I find the type "F" of that variable. So that, I can cast a given value to type "F" and send the casted value to the function setExact();

asked May 11 '18 at 08:13

Kaniz Mehnaz Sorna

2

You can't. That's all erased. – lexicore May 11 '18 at 08:17
Are you aware of: https://stackoverflow.com/questions/2929527/how-to-find-the-class-object-of-java-generic-type and https://stackoverflow.com/questions/1004022/java-generic-class-determine-type ? – jschnasse May 11 '18 at 08:27
Wouldn't it be enough to just cast to `OFValueType` in your case? – Marcus K. May 11 '18 at 09:25

How to Find the generic type of a class and cast a value to that type?

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