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Java - Confused by the one class per file rule

- by Mark

The one class per file rule in Java has me a bit confused. I writing an Android app and trying to implement the accepted answer to this question: Common class for AsyncTask in Android? which calls for an interface definition which class A implements and class B accepts as an argument to its constructor. So I need an A.java and a B.java, but where does the interface go? Does it need a separate java file itself? Do I have to define it inside both A and B? If not how to import it? Also I will have about 10 different AsyncTask classes, but I don't want to bother creating a new file for each one. What would you recommend? Is there a way to put all 10 classes in one file? Or should I create a big if/then block inside the class and pass an argument telling it which of the 10 different tasks I want it to do?

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Interpreters: Handling includes/imports

- by sub

I've built an interpreter in C++ and everything works fine so far, but now I'm getting stuck with the design of the import/include/however you want to call it function. I thought about the following: Handling includes in the tokenizing process: When there is an include found in the code, the tokenizing function is recursively called with the filename specified. The tokenized code of the included file is then added to the prior position of the include. Disadvantages: No conditional includes(!) Handling includes during the interpreting process: I don't know how. All I know is that PHP must do it this way as conditional includes are possible. Now my questions: What should I do about includes? How do modern interpreters (Python/Ruby) handle this? Do they allow conditional includes?

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Find Label Control in Repeater Asp.net

- by user2769165

I am using repeater and I want to find the label control in my repeater. here is my code <asp:Repeater ID="friendRepeater" runat="server"> <table cellpadding="0" cellspacing="0"> <ItemTemplate> <tr style=" width:700px; height:120px;"> <td> <div style=" padding-left:180px;"> <div id="leftHandPost" style="float:left; width:120px; height:120px; border: medium solid #cdaf95; padding-top:5px;"> <div id="childLeft" style=" padding-left:5px;"> <div id="photo" style=" border: thin solid black; width:100px;height:100px;"> <asp:Image id="photoImage" runat="server" ImageUrl='<%# String.Concat("Images/", Eval("Picture")) %>' Width="100px" Height="100px" /> </div> </div> </div> </div> </td> <td> <div id="rightHandPost" style=" float:right; padding-right:260px;"> <div id="childRight" style="width:400px; height:120px; border: medium solid #cdaf95; padding-top:5px; padding-left:10px;"> <strong><asp:Label id="lblName" runat="server"><%# Eval("PersonName") %></asp:Label></strong><br /> <div style=" float:right; padding-right:10px;"><asp:Button runat="server" Text="Add" onClick="add" /></div><br /> <asp:Label id="lblID" runat="server"><%# Eval("PersonID") %></asp:Label><br /> <asp:Label id="lblEmail" runat="server"><%# Eval("Email") %></asp:Label> </div> </div> </td> </tr> </ItemTemplate> <AlternatingItemTemplate> <tr style=" width:700px; height:120px;"> <td> <div style=" padding-left:180px;"> <div id="Div1" style="float:left; width:120px; height:120px; border: medium solid #cdaf95; padding-top:5px;"> <div id="Div2" style="padding-left:5px;"> <div id="Div3" style=" border: thin solid black; width:100px;height:100px;"> <asp:Image id="photoImage" runat="server" ImageUrl='<%# String.Concat("Images/", Eval("Picture")) %>' Width="100px" Height="100px" /> </div> </div> </div> </div> </td> <td> <div id="Div4" style=" float:right; padding-right:260px;"> <div id="Div5" style="width:400px; height:120px; border: medium solid #cdaf95; padding-top:5px; padding-left:10px;"> <strong><asp:Label id="lblName" runat="server"><%# Eval("PersonName")%></asp:Label></strong> <div style=" float:right; padding-right:10px;"><asp:Button id="btnAdd" runat="server" Text="Add" onClick="add"></asp:Button></div><br /> <br /> <asp:Label id="lblID" runat="server"><%# Eval("PersonID") %></asp:Label><br /> <asp:Label id="lblEmail" runat="server"><%# Eval("Email") %></asp:Label> </div> </div> </td> </tr> </AlternatingItemTemplate> <FooterTemplate> </table> </FooterTemplate> </asp:Repeater> Here is the code behind for the add button. protected void add(object sender, EventArgs e) { DateTime date = DateTime.Now; System.Web.UI.WebControls.Label la = (System.Web.UI.WebControls.Label)friendRepeater.FindControl("PersonID"); String id = la.Text; try { MySqlConnection connStr = new MySqlConnection(); connStr.ConnectionString = "Server = localhost; Database = healthlivin; Uid = root; Pwd = khei92;"; String insertFriend = "INSERT INTO contactFriend(friendID, PersonID, PersonIDB, date) values (@id, @personIDA, @personIDB, @date)"; MySqlCommand cmdInsertStaff = new MySqlCommand(insertFriend, connStr); cmdInsertStaff.Parameters.AddWithValue("@id", "F000004"); cmdInsertStaff.Parameters.AddWithValue("@personIDA", "M000001"); cmdInsertStaff.Parameters.AddWithValue("@personIDB", id); cmdInsertStaff.Parameters.AddWithValue("@date", date); connStr.Open(); cmdInsertStaff.ExecuteNonQuery(); MessageBox.Show("inserted"); connStr.Close(); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } I have get the error of Object reference not set to an instance of an object. I think is because there are no value in the Label. The Find Control are not working. May I know how can fix this problem? Thank you very much

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Calling from a parent file in python

- by Teifion

I have a file called main.py and a file called classes.py main.py contains the application and what's happening while class.py contains some classes. main.py has the following code main.py import classes def addItem(text): print text myClass = classes.ExampleClass() And then we have classes.py classes.py class ExampleClass (object): def __init__(self): addItem('bob') Surprisingly enough that's not the actual code I am using because I've stripped out anything that'd get in the way of you seeing what I want to do. I want to be able to call a method that's defined in main.py from a class within classes.py. How do I do this? Thanks in advance

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Tkinter mouse event initially triggered

- by user3714884

I'm currently learning Tkinter and I cannot find a solution for my problem here nor outside Stackoverflow. In a nutshell, all events that I bind to my widgets are triggered initialy and don't respond to my actions. In this example, the red rectangle appears on the canvas when I run the code, and color=random.choice(['red', 'blue']) revealed that the event binding doesn't work after that: import Tkinter as tk class application(tk.Frame): def __init__(self, master=None): tk.Frame.__init__(self, master) self.can = tk.Canvas(master, width=200, height=200) self.can.bind('<Button-2>', self.draw()) self.can.grid() def draw(self): self.can.create_rectangle(50, 50, 100, 100, fill='red') app = application() app.mainloop() I use a Mac platform, but I haven't got a clue about its role in the problem. Could anyone please point me at the mistake i did here?

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how can I open eclipse and see the project view I last looked at?

- by Stato Machino

I'm completely mystified. I do not understand why Eclipse does not show me my list of projects! And all the answers I've seen to similar questions do not mention any 'go here and do that' type of answers. I tried 'Import/General/Existing Projects into Workspace/browse-to...' but that told me the project was already in the workspace. But I KNEW THAT! The project menu does not have an 'open project' option!!!! There is no 'open workspace' option. How do people open Eclipse and 'resume working'??? What is the single, dependable, repeatable option for opening the 'project tree' to show my project? [or tell me my expectations that Java people are smarter are way off base!] Thanks, Kimball

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So I dynamically load a jar at runtime how do I use it?

- by justinhj

So question 194698 shows how to load a jar file at runtime and you can load individual named classes and get a Class object. Now my problem is I want to be able to cast those Classes to the types they really are, but I can't because I can't use an import since the whole point is to load it at runtime rather than compile time. It seems like the way to go is to use reflection to discover the functions and field names, but that seems brittle since the API in the jar files could change and the code won't break until it is run. Is there a better way?

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How to store data to Excel from DataSet without going cell-by-cell?

- by Jason Barnwell

Duplicate of: What’s the simplest way to import a System.Data.DataSet into Excel? Using c# under VS2008, we can create an excel app, workbook, and then worksheet fine by doing this: Application excelApp = new Application(); Workbook excelWb = excelApp.Workbooks.Add(template); Worksheet excelWs = (Worksheet)this.Application.ActiveSheet; Then we can access each cell by "excelWs.Cells[i,j]" and write/save without problems. However with large numbers of rows/columns, we are expecting a loss in efficiency. Is there a way to "data bind" from a DataSet object into the worksheet without using the cell-by-cell approach? Most of the methods we have seen at some point revert to the cell-by-cell approach. Thanks for any suggestions.

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Joomla! 2.5 use login data from another database

- by user1756746

I have a hard question. I'd like the joomla login does not use its own database for users/password but I want to use my database users with my table fields, my passwords etc.. I don't know from where start, I thought I could edit database request for login to my db or create a little script to automatically add the users on joomla database. I tried to see components/com_users/views/login/tmpl/default_login.php but it seems that there is nothing. Can someone help me figure out what to change? Maybe the simple thing is import my database users into database user joomla, is there any plugin or something else that you know? p.s. I use Clarion theme build on Gantry framework, Joomla! 2.5.6 Stable, PHP 5.2.17

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How to migrate Django models from mysql to sqlite (or between any two database systems)?

- by Daphna Shezaf

I have a Django deployment in production that uses MySQL. I would like to do further development with SQLite, so I would like to import my existing data to an SQLite database. I There is a shell script here to convert a general MySQL dump to SQLite, but it didn't work for me (apparently the general problem isn't easy). I figured doing this using the Django models must be much easier. How would you do this? Does anyone have any script to do this?

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Function from other module not detecting

- by Lethi

I two modules in same src folder. mod1 declares function I wish to use in module mod2: -module(mod1). -export([myfunc/1]). myfunc(A) -> {ok}. In other module I not import mod1: -module(mod2). If I do "mod1:" in mod2 it recognizes "myfunc", problem is at run-time when I call mod1:myfunc(A) I get "undefined function mod1:myfunc/1" I not understand why I get error if intellisense detect my mod1 function in mod2?

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Importing specific ( in my case - Themes.ThemesService.ThemesEnabled ) function / procedure in runet

- by HX_unbanned

Hi again :) I think subject tells everything ... I need this method only. No need to waste about 6Mb of included unit if only thing I need is one method from that unit ( Themes ) ... I was thinking of UxTheme unit, but it did not contain proper function. What Windows DLL do I need to import and what API function this method stands for? Thanks. P.S. Question is intended to cover not only this particular method, but others too as I will need to do same in MSXML and MM units ...

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outlook calendar connectivity with java web service

- by Isisagate

We currently have a java/jsp online web service that includes it's own custom calendar. I am trying to do some research into the possibility of connecting it to a users outlook. Our basic needs that are most simple is some way to sent the person a meeting request that can be added to their outlook from our service. I know the ideal solution is to sync back and forth but simply being able to import the data from our calendar into someone's outlook would be sufficient. Does anyone have any resources they can point me to that might help with information gathering, or any example/comments?

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Visual Studio Snippets: How to reference an assembly that is not in the GAC

- by user334220

Hi, I have a 3rd party non-signed assembly that I want to reference in several projects. So I created a snippet to add the reference and the relative imports I tried the following, and several variations with full paths, without file:// etc, to no avail. Any ideas? ... <Snippet> <References> <Reference> <Assembly>MyAssemly.dll</Assembly> <Url>file://C:\Program Files\MyProduct</Url> </Reference> </References> <Imports> <Import> ...

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Laravel 4 Aliases in custom classes

- by Leonel Franchelli

i want to use the alias classes on laravel 4 "facades" like App::method , Config::method. Well the thing is that i create a custom class and i have to import the namespaces like <?php namespace Face\SocialHandlers; use Illuminate\Support\Facades\App; use Illuminate\Support\Facades\Config; class FacebookHandler implements SocialHandlerInterface { public function registrar($perfil) { Config::get('facebook'); } } is there any way to use those classes like in controllers or routes files of the framework ? like <?php namespace Face\SocialHandlers; //use Illuminate\Support\Facades\App; //use Illuminate\Support\Facades\Config; class FacebookHandler implements SocialHandlerInterface { public function registrar($perfil) { Config::get('facebook'); } } Cya ps: sry for my english

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I'm getting the following error ''expected an indented block'' Where is the failing code?

- by user1833814

import math def area(base, height): '''(number,number) -> number Return the area of a wirh given base and height. >>>area(10,40) 200.0 ''' return base * height / 2 def perimeter(side1, side2, side3): '''(number,number,number) -> number Return the perimeter of the triangle with sides of length side1,side2 and side3. >>>perimeter(3,4,5) 12 >>>perimeter(10.5,6,9.3) 25.8 ''' return (side1 + side2 + side3) def semiperimeter(side1, side2, side3): return perimeter(side1, side2, side3) / 2 def area_hero(side1, side2, side3): semi = semiperimeter(side1, side2, side3) area = math.sqrt((semi * (semi - side1) * (semi - side2) * (semi - side3)) return area

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Multiple System.Web.Extensions assembly in same project?

- by CL4NCY

Hi, I'm having trouble moving a website from one server to another. It seems to be a problem loading multiple versions of System.Web.Extensions. The code uses version 3.5 in most places but a third party control appears to be needing version 1.0.6. I didn't think this was possible but it appears to be working in it's current situation. Is there a way I can use the GAC version of System.Web.Extensions for the site but import a dll of version 1.0.6 just for these controls?

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Is this a good approach to execute a list of operations on a data structure in Python?

- by Sridhar Iyer

I have a dictionary of data, the key is the file name and the value is another dictionary of its attribute values. Now I'd like to pass this data structure to various functions, each of which runs some test on the attribute and returns True/False. One approach would be to call each function one by one explicitly from the main code. However I can do something like this: #MYmodule.py class Mymodule: def MYfunc1(self): ... def MYfunc2(self): ... #main.py import Mymodule ... #fill the data structure ... #Now call all the functions in Mymodule one by one for funcs in dir(Mymodule): if funcs[:2]=='MY': result=Mymodule.__dict__.get(funcs)(dataStructure) The advantage of this approach is that implementation of main class needn't change when I add more logic/tests to MYmodule. Is this a good way to solve the problem at hand? Are there better alternatives to this solution?

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How to use external static files with Django (serving external files once again)?

- by Tomas Novotny

Hi, even after Googling and reading all relevant posts at StackOverflow, I still can't get static files working in my Django application. Here is how my files look: settings.py MEDIA_ROOT = os.path.join(SITE_ROOT, 'static') MEDIA_URL = '/static/' urs.py from DjangoBandCreatorSite.settings import DEBUG if DEBUG: urlpatterns += patterns('', ( r'^static/(?P<path>.*)$', 'django.views.static.serve', {'document_root': 'static'} )) template: <script type="text/javascript" src="/static/jquery.js"></script> <script type="text/javascript"> I am trying to use jquery.js stored in directory "static". I am using: Windows XP Python 2.6.4 Django 1.2.3 Thank you very much for any help

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need export query rather than creating file for mysqldump without triggers.. See description

- by OM The Eternity

I have code as $db_name = "db"; $outputfile = "/somewhere"; $new_db_name = 'newdb'; $cmd = 'mysqldump --skip-triggers %s > %s 2>&1'; $cmd = sprintf($cmd, escapeshellarg($db_name), escapeshellcmd($output_file)); exec($cmd, $output, $ret); if ($ret !=0 ) { //log error message in $output } Then to import: $cmd = 'mysql --database=%s < %s 2>&1'; $cmd = sprintf($cmd, escapeshellarg($new_db_name), escapeshellcmd($output_file)); exec($cmd, $output, $ret); //etc. unlink($outputfile); Bow here what should i do to get the export query, rather than creating a file everytime?

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Multiple levels of 'collection.defaultdict' in Python

- by Morlock

Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict, notably in readability and speed. I have put them to use with success. Now I would like to implement three levels of dictionaries, the two top ones being defaultdict and the lowest one being int. I don't find the appropriate way to do this. Here is my attempt: from collections import defaultdict d = defaultdict(defaultdict) a = [("key1", {"a1":22, "a2":33}), ("key2", {"a1":32, "a2":55}), ("key3", {"a1":43, "a2":44})] for i in a: d[i[0]] = i[1] Now this works, but the following, which is the desired behavior, doesn't: d["key4"]["a1"] + 1 I suspect that I should have declared somewhere that the second level defaultdict is of type int, but I didn't find where or how to do so. The reason I am using defaultdict in the first place is to avoid having to initialize the dictionary for each new key. Any more elegant suggestion? Thanks pythoneers!

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Is it good practice to export variables in Perl?

- by gvkv

I'm finding it very convenient to pass configuration and other data that is read or calculated once but then used many times throughout a program by using Perl's use mechanism. I'm doing this by exporting a hash into the caller's namespace. For example: package Myconfiguration; my %config; sub import { my $callpkg = caller(0); my $expsym = $_[1]; configure() unless %config; *{"$callpkg\::$expsym"} = \%config; } and then in other modules: use MyConfiguration (loc_config_sym); if ( $loc_config_sym{paramater} ) { # ... do stuff ... } However, I'm not sure about this as a best practice. Is it better to add a method that returns a hash ref with the data? Something else?

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add two float values in java

- by user1845286

acually i try to add two float values in java like this import java.text.DecimalFormat; class ExactDecimalValue { final strictfp static public void main(String... arg) { float f1=123.00000f; float f2=124.00000f; float f3=f1+f2; System.out.println(f1+f2); System.out.println("sum of two floats:"+f3); /*my expected output is:247.00000 but comming output is:247.0 and 247*/ } } Now what i can do to get the value in this format:247.00000. please any one help me. Thanks & Regards venkatesh

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how to read csv file in jquery using codeigniter framework

- by webghost

suppose this is my csv file fileempId,lastName,firstName,middleName,street1,street2,city,state,zip,gender,birthDate,ssn,empStatus,joinDate,workStation,location,custom1,workState,salary,payFrequency,FITWStatus,FITWExemptions,DD1Routing,DD1Account,DD1Amount,DD1AmountCode,DD1Checking,DD2Routing,DD2Account,DD2Amount,DD2AmountCode,DD2Checking 1,Dela Cruz,Juano,Santos,,,,,,1,,,Part Time Internship,, asd Division, Makati,one, asd,150,Bi Weekly,Not Applicable,100,,,,,,1234,9876,100,SAVINGS,BLANK 3,Palogan,Ralph,,,,,,,1,11-Mar-11,,Full Time Contract,2-Mar-11, sdf Department, pasay,, ,,,Not Applicable,,,,,,,,,,, 5,San,Goku,,,,hidden leaf,,,1,11-Mar-11,,,,,,,,,,Not Applicable,0,,,,,,,,,, this is my form <label>Choose File:</label><font color="#FF0000">*</font> <input type="file" name="file" id="file" /> <input type="button" id="importButton" value="Import" name="importButton" /> how to read the data in csv and store it to mysql database(codeigniter)? Any example code on how to do it,.

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How to deal with time zones in a Rails app with events...

- by Tony

I have a Rails app for bands. Bands can import their shows which all occur in different time zones. It seems like a ton of work to store these events in UTC. I would have to figure out the time zone for any show created and then convert back to the show's local time zone when displaying to the user. Is there a simple plugin to get a UTC offset based on geolocation? That would probably help, but does anyone see any major reasons why I should store in UTC here? I understand storing timestamps in UTC is probably a good idea...but band event times?

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