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

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. Ƚ�自：http://www.diybl.com/course/3_program/java/javaxl/20071220/92737.html. With the release of Java 5, the generics feature fixed this hole for collections (and in general). Collections and Substitution rules. [SIZE="4"][COLOR="red"]Tile: Java Generics and Collections [/COLOR][/SIZE] [SIZE="4"][COLOR="seagreen"]Release date: October 2006 [/COLOR][/SIZE] File size: 9.5 MiB | 1 Part Genre: Java. Ste Marie - Seattle, WA USAThis is a very basic introduction to the Java Collections. By myself and my colleague and friend Maurice Nafalin. The java generic program feature is unfamiliar to most of the programmers. Let us get into more practical matters. Overriding hashCode() and equals(). Collections are the primary motivation for Generics in Java. Lets see the anatomy of List interface defined in java.util package:. In Java, you will find Collection API's extensively uses generics as they are meant to contain any type of classes so it has to be generic in nature. Java Generics and Collections Not worth the price of purchase - Paul J. Let us take a look at some substitution rules. The generic helps to avoid unnecessary casting when dealing with objects in a collection. Generics are possibly the most talked about feature of Java 5 and Collections is the most powerful API. This usually results in bugs since the existing code assumes that the collection contains strings. You can use Generics like those shown in the following example. The following are some legal assignments:. It's finally out, after considerable effort over the last year. It builds ArrayDescriptor arrayDescriptor = new ArrayDescriptor("STRINGLIST",conn); // Translate the Java String{} to the Oracle SQL collection type.