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paquetage java util Peter Sander ESSI-Université de Nice Sophia Antipolis 4 java util ArrayList ❍ Solution il contient plusieurs objets (de la classe Object

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public class Main { public static void main(String[] args) { ArrayList liste = new ArrayList(); liste add(0); liste add(1); liste add(2); liste add(3); for(Object elt: liste) {

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[PDF] Chapter 14 Introduction to Generics The ArrayList Class The

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Chapter14

Generics

dh ALi an d t h e A rray Li st

ClassIntroductiontoGenericsIntroduction

to

Generics

andmethoddefinitionsthatinclude parametersfortypes

Suchdefinitionsarecalled

generics Such definitions are called generics -Genericprogrammingwithatypeparameter enablescodetobewrittenthatappliestoany class The

ArrayList

Class The

ArrayList

Class i ilihddJlib i A rrayL i st i sac l ass i nt h estan d ar d J ava lib rar i es beencreatedan

ArrayList

isanobjectthatcangrowbeen created an

ArrayList

is an object that can grow andshrinkwhileyourprogramisrunning

Ingeneral,an

ArrayList

servesthesamepurpose In general, an

ArrayList

serves the same purpose asanarray,exceptthatanArrayListcanchange len g thwhilethe p ro g ramisrunnin g gpgg The

ArrayList

Class The

ArrayList

Class anarra y asa p rivateinstancevariable yp is created and the data is transferred to this newarray The

ArrayList

Class The

ArrayList

Class Whl i idf Wh ynota l waysusean A rrayL i st i nstea d o f an array? 1 A ALit ilffi i tth 1 A n A rray Li s t i s l esse ffi c i en t th ananarray

2. Itdoesnothavetheconvenientsquarebracketnotation

3

Thebasetypeofan

ArrayList

mustbeaclasstype 3 The base type of an

ArrayList

must be a class type

Thislast

p ointislessofa p roblemnowthatJava p rovides ppp automaticboxingandunboxingofprimitives

Usingthe

ArrayList

Class Using the

ArrayList

Class •Inordertomakeuseofthe A rrayListclass,it mustfirstbeimportedfromthepackage java.util •An A rrayListiscreatedandnamedinthesame thebasetypeasfollows:

ArrayList aList =

new ArrayList();

Usingthe

ArrayList

Class Using the

ArrayList

Class

ArrayList

aswell ALit

Thefollowingcodecreatesan

A rray Li s t thatstores items

ArrayList list =

new ArrayList(20);

Specifying

an initial capacity does not limit the size to whichanArrayListcaneventuallygrow

NotethatthebasetypeofanArrayListisNote

that the base type of an

ArrayList

is specifiedasatypeparameter

Usingthe

ArrayList

Class Using the

ArrayList

Class •The a d d methodisusedtosetanelement forthefirsttimeinanArra y List y list.add("something");

Themethodname

add isoverloaded The method name add is overloaded -Thereisalsoatwoargumentversionthat an item to be added at any currently usedindexpositionoratthefirstunused position

Usingthe

ArrayList

Class Using the

ArrayList

Class indicesalreadyhaveelementsinthe ALitA rray Li s t int howMany = list.size(); Th hdidlii Th esetmet h o d i suse d torep l aceanyex i st i ng element,andthegetmethodisusedtoaccess thevalueofanyexistingelementthe value of any existing element list.set(index, "something else");String thing = list get(index);String thing list get(index);

Tip:SummaryofAddingtoan

ArrayList

h hdilldl •T h ead d met h o d i susua ll yuse d top l acean elementinanArrayListpositionforthe firsttime atanArrayListindex •Thesim p lestadquotesdbs_dbs17.pdfusesText_23