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of the array – The number in square brackets is called an index or subscript I J i di tb b d t ti ith 0 d – In Java, indices must be numbered starting with 0, and



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Chapter6

ArraysIntroductiontoArraysIntroduction

to

Arrays

A idtttdt

Anarray

i sa d a t as t ruc t ureuse d t array behaves like a numbered list of variables with a uniformnamingmechanism -Forexample,givenfivescores: score[0] score[1] score[2] score[3] score[4]score[0] score[1] score[2] score[3] score[4]

CreatingandAccessingArraysCreating

and

Accessing

Arrays

Ahbhlikhill ifiblllf

A narrayt h at b e h aves lik et hi sco ll ect i ono f var i a bl es,a ll o f double score = new double 5 •Orusingtwostatements:double[] score;score = new double[5]; t yp edouble yp

CreatingandAccessingArraysCreating

and

Accessing

Arrays

arrayarecalledindexedvariables ofthearray-

Thenumberinsquarebracketsiscalledaninde

x or subscript IJ iditbbdttiith 0 d I n J ava, i n di cesmus t b enum b ere d s t ar ti ngw ith 0 ,an d nothingelse score[0] score[1] score[2] score[3] score[4]score[0] score[1] score[2] score[3] score[4]

CreatingandAccessingArraysCreating

and

Accessing

Arrays

Thbfid dibliill d

Th enum b ero f i n d exe d var i a bl es i nanarray i sca ll e d thelengthorsizeofthearray

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Wh enanarray i screate d ,t h e l engt h o f t h earray i s giveninsquarebracketsafterthearraytype

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Th e i n d exe d var i a bl esaret h ennum b ere d start i ng thanthelengthofthearraythan the length of the array score[0], score[1], score[2], score[3], score[4]

CreatingandAccessingArraysCreating

and

Accessing

Arrays

do ble[] score ne do ble[5]do u ble[] score ne w do u ble[5]

5above

double[] score = new double[count]; classtypeclass type

DeclaringandCreatinganArrayDeclaring

and

Creating

an Array waythatobjectsaredeclaredandcreated:

BaseType[] ArrayName= new BaseType[size];

ttiitfl it ibl t oanonnega ti ve i n t eger, f orexamp l e,an i n t var i a bl e char[] line = new char[80];double[] reading new double[count]; double[] reading new double[count];

Person[] specimen = new Person[100];

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