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"If you find yourself writing way too many ? extends constructs and think you shouldn't need to, you probably should re-think whether you actually want an abstract class or whether an interface would do the job for you."
Java 2 Platform, Standard Edition 5.0 (J2SE 5.0) introduced generics to the Java programming language and platform. In the simplest case and typical usage, generics allow for the identification of what you want to store in a collection. So instead of sayi
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