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Java Generics and Collections Maurice Naftalin Maurice, Philip Wadler
Publisher: O'Reilly Media

The most common examples are container types, such as those in the Collections hierarchy. Generics are possibly the most talked about feature of Java 5 and Collections is the most powerful API. Java Generics and Collections Not worth the price of purchase - Paul J. Generics allow you to abstract over types. Martijn Verburg says: April 17, 2013 at 4:36 pm. So i wrote up the following code to add a similar nomber of objects to a collection. Please help me understand why add1() and add4() report errors and why add2() and add3() don't. Overriding hashCode() and equals(). After working with Java for almost 15 years and deep knowledge of Java generics on the class format level I learned something very basic the really, really hard way. Specifically, please show examples of undesired consequences if the compiler allowed each of these to compile. I'm new to java and I got a test today and kind of failed to make it, I was hoping that someone could explain it to me because I still don't get how to use Generic collections. I just finished reading the Java Generics book by Maurice Naftalin and Philip Wadler. Code designers will be using generics to make code more flexible in more than just collections. Ste Marie - Seattle, WA USAThis is a very basic introduction to the Java Collections. Phil Wadler and Maurice Naftalin are writing a book titled "Java Generics and Collections", to be published by O'Reilly Media, Inc. Since I've been taken to task in the past for my cogent observations of Java's, um, shall we say "unintuitive" behavior, particularly in the era of generics and autoboxing, I'm just going to put this one out there without making any (public (explicit)) value That is, inside the method, any subclass or SuperType could be added to the list (since it's just a Collection of SuperType) but then List would not only contain SubtypeOfSuperType objects. The way generics change collections is not the end of the story. 2 Responses to “Java Generics – how to strike a balance between expressiveness and simplicity”. I wanted to test the raw performance of using java generics with collections.