By Naftalin M., Wadler P.
This finished advisor indicates you ways to grasp an important alterations to Java because it used to be first published. Generics and the enormously elevated assortment libraries have significantly elevated the facility of Java five and Java 6. yet they've got additionally stressed many builders who havent identified tips on how to reap the benefits of those new features.
Java Generics and Collections covers every little thing from the main easy makes use of of generics to the strangest nook instances. It teaches you every thing you must learn about the collections libraries, so youll regularly comprehend which assortment is acceptable for any given activity, and the way to take advantage of it.
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Additional info for Java Generics and Collections
Com> To sum up, we have seen how generics, boxing and unboxing, foreach loops, and varargs work together to make Java code easier to write, having illustrated this through the use of the Collections Framework. 5 Assertions | 13 CHAPTER 2 Subtyping and Wildcards Now that we’ve covered the basics, we can start to cover more-advanced features of generics, such as subtyping and wildcards. In this section, we’ll review how subtyping works and we’ll see how wildcards let you use subtyping in connection with generics.
Now we can give the methods the following signatures, directly stating that they work for all types: public static
Won’t fix the problem, because now we have two lists with (possibly different) unknown element types. size()-i-1)); } } Here we say that the type variable T has captured the wildcard. This is a generally useful technique when dealing with wildcards, and it is worth knowing. 7 Wildcard Capture | 27 Another reason to know about wildcard capture is that it can show up in error messages, even if you don’t use the above technique. In general, each occurrence of a wildcard is taken to stand for some unknown type.