| Publisher | Association for Computing Machinery | ||
|---|---|---|---|
| Format | 129.2KB PDF | Date added | 17 Mar 2004 |
| Topics | Java, Programming Languages, Application Development | ||
| Downloads | 4 | ||
This paper describes wildcards, a new language construct designed to increase the flexibility of object-oriented type systems with parameterized classes. Based on the notion of use-site variance, wildcards provide a type safe abstraction over different instantiations of parameterized classes, by using '?' to denote unspecified type arguments. Thus they essentially unify the distinct families of classes often introduced by parametric polymorphism. Wildcards are implemented as part of the upcoming addition of generics to the Java programming language, and will thus be deployed world-wide as part of the reference implementation of the Java compiler javac available from Sun Microsystems, Inc.
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