New PDF release: Java Generics and Collections
By Naftalin M., Wadler P.
This complete advisor indicates you ways to grasp crucial adjustments to Java because it used to be first published. Generics and the vastly extended assortment libraries have drastically elevated the ability of Java five and Java 6. yet they've got additionally careworn many builders who havent identified find out how to benefit from those new features.
Java Generics and Collections covers every thing from the main uncomplicated makes use of of generics to the strangest nook circumstances. It teaches you every thing you must learn about the collections libraries, so youll consistently comprehend which assortment is acceptable for any given job, and the way to take advantage of it.
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Extra info for Java Generics and Collections
To put elements into the structure we need another kind of wildcard, as explained in the next section. 3 Wildcards with super Here is a method that copies into a destination list all of the elements from a source list, from the convenience class Collections: public static
4 Comparator | 41 public static
> listComparator(final Comparator = 0) return k; } return (n1 < n2) ? -1 : (n1 == n2) ? 0 : 1; } }; } The loop compares corresponding elements of the two lists, and terminates when corresponding elements are found that are not equal (in which case, the list with the smaller element is considered smaller) or when the end of either list is reached (in which case, the shorter list is considered smaller). This is the usual ordering for lists; if we convert a string to a list of characters, it gives the usual ordering on strings.
7 Wildcard Capture When a generic method is invoked, the type parameter may be chosen to match the unknown type represented by a wildcard. This is called wildcard capture. Collections, which accepts a list of any type and reverses it. > list); public static void
Java Generics and Collections by Naftalin M., Wadler P.