java - Adding a values to a instance of ArrayList<Integer> can be only done sequentially -


after creating 

arraylist<integer> connectedto = new arraylist<>(); connectedto.add(0,4); connectedto.add(3,4);

in above mentioned statement connectedto.add(0,4) inserts value 4 in zeroth position expected.

but connectedto.add(3,4) throws java.lang.indexoutofboundsexception. why happening?. understanding arraylist suppose resize dynamically , allow insertions right?.

is there way overcome this?. incase of python creating expression

vertlist = {} vertlist[0] = 1 vertlist[2] = 3

allows me save values in various indexes without issues. how implement code perform's same operation.

i afraid mismatching 2 different data types. {} dictionary, allows map values. on other hand, arraylist kind of list should initialize in python using []. python code provided list won't working. suppose, add method have used adds element @ @ end of list.

take @ one: in python, when use dictionary, list or set?

this question , answers understand difference between popular collection types , choose best case.


Comments

Post a Comment

Popular posts from this blog

php - How to add and update images or image url in Volusion using Volusion API -

actually have store importing products store product data insert , update image or image url not insert , update. this xml code name datapro.txt. <products_joined> <productcode>3710_012t</productcode> <vendor_partno>eah5450silent/di/1gd3(lp)</vendor_partno> <productname>test product ta</productname> <hideproduct>n</hideproduct> <stockstatus>20</stockstatus> <lastmodified>1/5/2016 10:25:00 am</lastmodified> <lastmodby>2</lastmodby> <productweight>0.9</productweight> <productprice>100</productprice> <productmanufacturer>asus tek</productmanufacturer> <vendor_price>32.69</vendor_price> <numproductssharingstock>0</numproductssharingstock> <categoryids>107</categoryids> <producturl>http://tebkq.mvlce.servertrust.com/productdetails.asp?productcode=3710_012t</producturl>
Read more

javascript - IE9 error '$'is not defined -

Image
<!--[if lte ie 9]><html class="lte9"><![endif]--><!--[if gt ie 9]><html><![endif]--> <!--[if !ie]><!--> <html> <!--<![endif]--> blah blah <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <script src="{{ asset('js/mypage.js') }}" type="text/javascript"></script> </body> </html> when load page, ie9 brings error '$' not defined . how can solve error? +++ mypage.js $(function(){ //when load page, //ie9 tag not moving. $(window).load(function() { $('div.mask').hide(); }); // when click , willshow show. //for not ie 9 if (!$('html').hasclass('lte9')) { var = $('ul.about > li > span.activebtn');
Read more