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Java Generics and Collections by Maurice Naftalin Maurice, Philip Wadler

Java Generics and Collections Maurice Naftalin Maurice, Philip Wadler ebook
Format: chm
Publisher: O'Reilly Media
ISBN: 0596527756, 9780596527754
Page: 288

Suppose you have Java classes The answer to this riddle is that Java is designed to work with all kinds of generic classes, not just those which are collection-like. By myself and my colleague and friend Maurice Nafalin. I recently wrote a blog entry about reluctantly accepting Java Generics. Check chapters 2 and 3 of Java Generics and Collections. This second program on stack creates generics stacks storing all ints, doubles, chars and strings. Wildcards have been introduced to Java some years ago (in JDK 1.5). A well written book that explains generics really nicely, including some difficult concepts. Extends User> alist = new ArrayList users){} but I cannot instantiate that same List in a similar way? Find a Y that's a superclass of both, and it finds java.util.Date, and java.util.Date actually implements Comparable, so the 2nd piece of code compiles. In this excerpt from Java Generics and Collections, authors Maurice Naftalin and Philip Wadler show what to do when genericizing client code that calls a non-genericized library. Arrays behave differently from the collections because arrays are covariant by default, which means that S[] is a subtype of T[] whenever S is a subtype of T, where as Generics does not support covariance.