CODEWITHSUNDEEP
javaclassgenericsgeneric-collections
rajesh
rajesh

Reputation: 3407

"> expected" error on creating a class with generics

I am creating a class with Generics

public class MyEntry<K,Set<V extends SpecificEntry>> extends TimerTask{
//
}

But this is generating an error > expected As I see, the diamond operator is closed properly

If I make it 

public class MyEntry<K,Set> extends TimerTask{
//
}

It works, but I want the second argument to be a set of a specific type.

What should be done to get this right?

Upvotes: 1

Views: 614

Answers (2)

Jiri Tousek
Jiri Tousek

Reputation: 12440

A possible solution is not to use parameter for the Set generic type, but instead parameterize just the element type of the Set:

public class MyEntry<K, V extends SpecificEntry> extends TimerTask{
    //
}

and then use Set<V> where needed.

Upvotes: 0

Eran
Eran

Reputation: 393781

If you want the second generic parameter to be a Set of a given type you need:

public class MyEntry<K,V extends Set<? extends SpecificEntry>> extends TimerTask

BTW, public class MyEntry<K,Set> extends TimerTask doesn't work the way you think. Set in your case is the name of the second generic type parameter, and has no relation to java.util.Set.

Upvotes: 2

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