CODEWITHSUNDEEP
javagenerics
StackOverflowed
StackOverflowed

Reputation: 5975

Converting generic ArrayList

Is it possible to convert:

ArrayList<?> objects; to ArrayList<String>() if you know objects only contains Strings?

Upvotes: 1

Views: 77

Answers (2)

Tourki
Tourki

Reputation: 1774

ArrayList<?> anonymList = null;
ArrayList<String> strings = (ArrayList<String>) anonymList;

Upvotes: 2

SLaks
SLaks

Reputation: 887365

Yes; just cast it.
You will get a compile-time warning, because even though you know that, the compiler doesn't.

Beware that if someone else adds some other class to the list after you cast it, you will get exceptions when you try to use it.

This is only true because of type erasure.

Upvotes: 7

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