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How do I specify a generic for an instance field? What is the correct syntax?
For example how do I make an instance field of type T where T extends Sprite? I'm thinking something like the following but it doesn't seem to work:
private <T extends Sprite> Collection<T> someName;
For methods I can just write the following
public <T extends Sprite> void foo(Collection<T> param)...
but I'm not sure how to do this for a field. My class is not generic in itself and I do not wish it to be.
I would have it simply be a collection of Sprite.
Code:private Collection<Sprite> someName;
How do I specify a generic for an instance field? What is the correct syntax?
For example how do I make an instance field of type T where T extends Sprite? I'm thinking something like the following but it doesn't seem to work:
private <T extends Sprite> Collection<T> someName;
For methods I can just write the following
public <T extends Sprite> void foo(Collection<T> param)...
but I'm not sure how to do this for a field. My class is not generic in itself and I do not wish it to be.
I don't believe you can do this unless the class is generic. With generic methods, the compiler can work out the type T from the arguments used, but for a member field, it has nothing to go on, unless T has been specified in the class instantiation.
If you explain what you are trying to achieve, we may be able to find an alternative approach.
In your case, it would be:
private Collection<? extends Sprite> someName;
Moderator action: Two threads merged. Origin poster, please don't double post your questions.