Covariance in Java
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by Bobby
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Published on 2010-06-16T04:51:27Z
Indexed on
2010/06/16
5:12 UTC
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java
|covariance
Why does the following not work in Java? It would work in C#:
public static final List<String> Split(String str, char delimiter)
{
if ((str == null) || "".equals(str))
{
return new CopyOnWriteArrayList<String>();
}
}
I get an error saying this method has to return List. CopyOnWriteArrayList implements the List interface. Why does covariance not apply on return values in Java?
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