Revision as of 12:28, 22 July 2014 edit Polemyx (talk \| contribs) 359 edits m →Bounded Wildcards: corrected non-standard use of prepositions, and lack of conjunction between phrases ← Previous edit		Revision as of 12:31, 22 July 2014 edit undo Polemyx (talk \| contribs) 359 edits m →Object Creation with Wildcard: corrected punctuation; added indefinite articles required by standard English Next edit →
Line 43: == Object Creation with Wildcard == No objects may be created with a wildcard type parameter: <code>('''new''' Generic<?>()</code> is forbidden because <code>Generic<?></code> is abstract). In practice, this is unnecessary because if one wanted to create an object that was assignable to a variable of type <code>Generic<?></code>, one could simply use any arbitrary type (that falls within the constraints of the wildcard, if any) as the type parameter. On the other hand, an array object that is an array of a parameterized type may be created only by an unconstrained (i.e. with a wildcard type parameter) type (and by no other instantiations) as the component type: <code>'''new''' Generic<?>[20]</code> is correct, while <code>'''new''' Generic<UpperBound>[20]</code> is prohibited. An example of using a wildcard in List's instantiation is contained in the article [[Generics in Java]]. == Example: Lists ==

Wildcard (Java): Difference between revisions