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Java Generics and Collections

Java Generics and Collections. Maurice Naftalin and Philip Wadler. Beijing • Cambridge • Farnham • Köln • Sebastopol • Taipei • Tokyo 



Generics in the Java Programming Language

Tir 15 1383 AP Whereas the old code could be called with any kind of collection as a parameter



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Java Generics. 3. Java 5. Some features in new language boxing/unboxing new form of loop Iterator supports iteration through a collection.



GENERICS AND THE JAVA COLLECTIONS FRAMEWORK

Early versions of Java lacked generics… 3. Java Collections interface Collection {. /* Return true if the collection contains o */.



Java™ Generics and Collections: Tools for Productivity

class SuccessfulConversion { static <T> T[] toArray(Collection<T> c T[] a) { if (a.length < c.size()) a = (T[])Array.newInstance( // unchecked cast.



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Ordibehesht 28 1396 AP generic classes. ? java collections framework. – collections framework (pre JDK 5). – collections framework with generics.



Java Generics and Collections

Java Generics and Collections By Philip Wadler Maurice Naftalin ISBN: This PDF is exclusively for your use in accordance with the Safari Terms of ...



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"Practicalities - Programming With Java Generics" aims to address issues that arise when Should I use the generic collections or better stick to the old ...



JAVA GENERICS

Early versions of Java lacked generics… 4. Java Collections interface Collection {. /** Return true iff the collection contains ob */.





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O'Reilly Media Inc Java Generics and Collections the image of an alligator example deviates from best practice in that the files are closed in a 



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A comprehensive introduction to the Collections Framework appears in the second part of the book The first five chapters focus on the fundamentals of generics



[PDF] Lecture 10/11 : Java Generics and Collections

Java Generics 1 CS6202: Advanced Topics in Programming Languages and Systems Lecture 10/11 : Java Iterator supports iteration through a collection



[PDF] GENERICS AND THE JAVA COLLECTIONS FRAMEWORK

Suppose we want to write a helper method to print every value in a Collection 14 Printing Collections void print(Collection c) { for (Object 



[PDF] Java™ Generics and Collections: Tools for Productivity

The Right Tools for the Job What you can – and can't! – do with the Generics and Collections features introduced in Java 5 and Java 6 



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Java generics are realized by mapping Raw types (free of type parameters/arguments) appear in class files java util Interface Collection



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2007 JavaOne

SMConference | Session TS-2890| TS-2890Java™Generics and Collections: Tools for Productivity

M a urice N a ftal i n, M o rningside Light Ltd

Philip W

a d l er,

University o

f

Edinburgh

2007 JavaOne

SMConference | Session TS-2890| 2

The Right Tools for the Job

What y

o u can -and can't! -do with the

Generic

s and C o llections features intro d u c ed in Ja v a 5 and Java 6

2007 JavaOne

SMConference | Session TS-2890| 3

Agenda

Generics

Why have them?

Impl e m e ntation by erasure -benefits ... ...and problems

What next?

Collecti

o ns

Trends i

n concurrency policy

Trends i

n

API design

H o w to choose an impl e m e ntation

2007 JavaOne

SMConference | Session TS-2890| 4

Generics

Generics

W h y ha v e the m? Impl e m e ntation by erasure -benefits ... ...and problems

What next?

Collecti

o ns

Trends i

n concurrency policy

Trends i

n

API design

H o w to choose an impl e m e ntation

2007 JavaOne

SMConference | Session TS-2890| 5

Cleaner code

B e fo r e: Li s t in t s A r r a ys a sL is t 1 ,2 3 in t s 0; fo r It e r at or i t i nt s. i t e ra t o r( i t .h a s Ne xt s it n ex t( A ft er: Li s t In t e ge r> i n ts A rr a y s .a s L is t( 1 2 ,3 in t s 0; fo r in t n i n t s) s n

2007 JavaOne

SMConference | Session TS-2890| 6

Strategy pattern for paying tax:

in t e r fa c e S tr a t e gy P e xt e n d s P a ye r> l on g co mp u t e Ta x P p) cl a s s D e f au lt S t r at e g y< P e x t en d s P ay e r> im p l e me n t s St r a t eg y P> l o ng c om pu t e T ax P p cl a s s T r u st Ta x S t ra t e gy e x t e nd s De fa u l t St r a te gy T r us t pu b l i c l o ng c o m p ut e T ax (T r u s t t r e tu r n t ru s t is N o nP ro f i t 0 s u p e r. c o mp ut e T a x( t new Tr us tTaxSt ra tegy() .c ompute Ta x(persquotesdbs_dbs17.pdfusesText_23
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