Software Development Forum

## Introduction ## In Java 8, `@Repeatable` was introduced and this is the recommended way to create repeating annotations. We still have to create a holder Annotation(*annotation that holds an array of other annotations*), but we no longer have to declare the holder Annotation at the callsite. This tutorial aims …

## Introduction ## Java 14 was released with a new type of expression called Switch Expression. Its syntax is similar to that of the Switch Statement, with a few differences. In this tutorial, we will walk through concepts related to the Switch Expression and learn how to use it. ## …

## Introduction ## This tutorial introduces the `CyclicBarrier` class and teaches you how to use it. ## Goals ## At the end of this tutorial, you would have learned: 1. How to use `CyclicBarrier` to synchronize tasks across multiple threads. ## Prerequisite Knowledge ## 1. Intermediate Java. 2. Basic knowledge …

## Introduction ## `partitioningBy()` collects a `Stream` into a `Map`. In this tutorial, we will compare the two different `partitioningBy` methods and learn how to use them. ## Goals ## At the end of this tutorial, you would have learned: 1. What `Collectors.partitioningBy` does and how to use it. ## …

## Introduction ## Based on the 2020 Java Ecosystem survey from Jetbrains, 75% of Java developers are still using JDK 8. JDK 11 introduces `HttpClient`, which replaces the legacy `HttpURLConnection` API. For this tutorial, we will build a `HttpClient` that consumes the free Cat Facts API. ## Goals ## At …

Is there a way to search a drive's files only for a specific file format, then display them to the user (and stored somewhere to be used later)? Maybe with the Shell, but I don't know how to use it very well. At the moment, I have a dropdown to …

So im actually creating a fastfood menu in which save how many times a button been clicked as a variable. So I can multiply it to its value. For example if i click btnChicken a variable will count how many btnChicken been clicked then it will multplied on the amount …

There are times when you need to make sure your counter starts at an odd or even number. Even is pretty simple - `counter = counter + modulus(counter)`. If counter is even it stays, if it's odd it gets incremented by 1. Odd is a bit more complicated - `counter …

As part of a project to manage my collection of photos, I wanted to add the capability of displaying a series of files as thumbnails. This posed me with three problems: 1. how to preserve the aspect ratio of the original images 1. how to generate the thumbnails without tying …

How do I process the xamarin forms that connect to SQL Server and export data to the listView ? I'm looking for this simple example. What do I find on google ?

This simple isprime(number) function checks if the given integer number is a prime number and returns True or False. The function makes sure that the number is a positive integer, and that 1 is not considered a prime number. To find out if an integer n is odd one can …

[B]Intro[/B] This tutorial provides a brief introduction to the random number functions that come as part of the C++ standard library, namely rand() and srand(). [b]rand() and RAND_MAX [/b] The C++ standard library includes a pseudo random number generator for generating random numbers. In order to use it we need …

PySide (public license PyQT) is my preferred Python GUI toolkit. Here we explore how to test some of the widgets available and create a digital clock.

Sometimes when you get a large check from your employer, the value is written out in words. I get those all the time of course. So I wrote this little Python code to convert an integer value to english words. Numbers as high as 999 vigintillion can be used. In …

Chaps, I wonder if you can give me a hand with this. Here's the brief: "Create a program that draws 10 random filled shapes in random colors, position and sizes. Method paintcomponent should contain a loop that iterates 10 times. In each iteration, the loop should determine whether to draw …

I'm sure I've mentioned this type of wrapper class for accessing databases in a provider-agnostic manner before, but never posted a functional implementation. So here it is. Questions, comments, and suggestions are welcome as always. :)

Sometimes there are functions you want your program to perform in the background while you are busy doing other things. For example, if you are building a picture viewer application you may not want to wait until thumbnails are generated before getting on with the business of viewing the pictures. …

[B]Expression evaluation using Emit[/B] This class was designed to evaluate simple mathematical expressions. But instead of developing a routine to do the calculating, we use Emit to dynamically build a method that does the math for us. IMPORTANT: This is done with integer math. 7/2*3 = 9, not 10.5 (or …

This simple key logger shows any character/special key when pressed.

Hi, I guess I'll post here with my problem as well my introduction. I've coded in Java in high school for 2 years but my teacher was horrible so I decided to wait till college to take another programming class. Well I'm Programming Fundamentals and have been assigned a program …

Here is a weird regular expression for emails . We can have various kind of email addresses [email]string1@somemail.com[/email] [email]string1@somemail.co.in[/email] [email]string1.string2@somemail.com[/email] [email]string1.string2@somemail.co.in[/email] The following regular expression can find any of the mails above email2="santa.banta@gmail.co.in" email1="arindam31@yahoo.co.in'" email="bogusemail123@sillymail.com" email3="santa.banta.manta@gmail.co.in" email4="santa.banta.manta@gmail.co.in.xv.fg.gh" email5="abc.dcf@ghj.org" email6="santa.banta.manta@gmail.co.in.org" [CODE]re.search('\w+[.|\w]\w+@\w+[.]\w+[.|\w+]\w+',email) >>> x=re.search('\w+[.|\w]\w+@\w+[.]\w+[.|\w+]\w+',email2) >>> x.group() 'santa.banta@gmail.co.in' >>> x=re.search('\w+[.|\w]\w+@\w+[.]\w+[.|\w+]\w+',email1) >>> x.group() 'arindam31@yahoo.co.in' …

Just a simple exploration of the goslate module (uses the Google Translate API) to translate some common languages. However, some IDE's create character problems. Note: Your computer has to be connected to the Internet to access Google.

I made a little py editor because I didn't want to go to all the troble of installing an idle, but I didn't like notepad either. Here it is!

If you have any ideas for a code snippet you'd like to see, please post them here. We can't depend on the snippet writers to come up with all of the ideas, can we? ;)

It's started (: Find some videos that are interesting,feel free to post link or discuses it here. I was looking most forward to David Beazley talks. Live coding with Concurrency as topic,doesn't get much better than this. [David Beazley - Python Concurrency From the Ground](https://www.youtube.com/watch?v=MCs5OvhV9S4) The main talk David Beazley …

Howdy all. I've recently been considering doing an online meeting or webcast on certain subjects for which I have a lot of experience or knowledge. The idea being that something too long or complex for a Daniweb article can be more easily shown by sharing my desktop and talking about …

This "FakeWebClient" will allow a C# application to send and receive cookies as part of the request. This behaviour is not available by default. Please note that on line 35 there is a possible NullReferenceException, I managed this at a level higher but you may wish to handle it in …

People who know me know that Python has always been one of my favorite languages. And over the years, I've been pleased with the array of development tools that have been created for it, including the different IDEs. I also do a lot of work in .NET, primarily with C#. …

One way to find the shortest distance between a series of surface (x, y) points is to let Python module itertools find the non-repeating combinations of point pairs. Now you can apply the Pythagoras' theorem to find all the distances and the minimum distance.

A simple way to find out a Python module's location on your drive.

With just about everybody snooping around your emails today with the excuse of hunting the bad guys, coding to keep some resemblance of privacy is getting important. I will start out with some simple encryption examples to get this started. You are invited to give us your thoughts and codes. …

Knowing the longitude and latitude coordinates of two cities you can calculate the distance between them. Use the code in https://www.daniweb.com/software-development/python/code/490561/postal-code-zips-and-location-python to find the coordinates.

A look at [Dataset](http://dataset.readthedocs.org/en/latest/) and easy and Pythonic way to create a database. Other candidates in this categorie,i will mention [pyDAL](https://github.com/web2py/pydal) and [Peewee](https://peewee.readthedocs.org/en/latest/). I did some test of Dataset in this [post](https://www.daniweb.com/software-development/python/threads/490219/how-can-i-creat-e-text-file-to-use-as-a-database-in-python) to look at. So here a common task some web-scraping of food recipes(just a task i did help …

A dictionary in Python is an unordered set of key:value pairs. I show you how to initialize, create, load, display, search, copy and otherwise manipulate this interesting container. Like the name says, it is the closest thing to a dictionary.

Use the PySide (PyQT) GUI toolkit to play animated gif files.

hey you guys I just want to take this time to wish your guys a merry christmas and a bright and prosperous new year, I know that I will have to do over this programming course in the next semester even though i havent got any result yet. still havent …

[ATTACH=RIGHT]22389[/ATTACH]CodeToGo is, essentially, an API wrapper around the Ideone.com online compiler and debugger that enables you to use it to compile and run code in around 50 different programming languages on your iPhone or iPad. It has been around for a while but has always been somewhat tarnished with the …

With the advent of Python33 the module time has received a high resolution timer/counter. Here we use time.perf_counter() in a decorator to conveniently time two test functions.

Here's a simple game code, open a new vb project and copy paste this code and hit run. the game contains 3 levels, all you have to do is to shoot the smiley faces to earn money using mouse clicks, also there's a boss enemy on level 3. I didn't …

Similiar to the snippet posted at: http://www.daniweb.com/software-development/python/code/449036/display-an-image-from-the-web-tkinter but this time we use PIL to resize the image from the internet keeping its aspect ratio to fit a specific display area/box.

Please read through the following suggestions before posting in this forum. Questions in this forum are answered by people who generously volunteer their time. Following these guidelines will increase the chances of getting a quick and accurate answer. 1. Use Search to see if your question has been asked and …

This short Python program calculates Euler's number e, the base of natural logarithms, to a precision of at least 100 digits in this case. To get the precision needed, the Python module decimal is used. The result is compared to a published result.

A feature of the doctest module can be useful when people copy and paste their idle window in the python forum: the ability to transform an example from the python interpreter into python code without the prompts [icode]>>>, ...[/icode] and the output messages. The script below permits to use this …

A Tkinter image button that toggles between an up and down button image.

Is HACK object orientated and what application development is it designed for?

I [saw interesting problem](http://www.daniweb.com/software-development/legacy-languages/threads/478323/prolog) of generating spiral of numbers and realized I could reuse [my code for rotation](http://www.daniweb.com/software-development/python/code/371536/rotate-sequences-left-or-right) I posted earlier.

If you use the Windows OS, then IronPython allows you to create a GUI program taking advantage of the .NET framework. You also have the option to compile the program into a standalone .exe file (and the needed .dll file).

Hi! I don't know where to post this, but since this is vb6 thread i'll just post it here. I need all of your support by voting Visual Basic Classic to be improved. here is the link: [Bring back Classic Visual Basic, an improved version of VB6](http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/3440221-bring-back-classic-visual-basic-an-improved-versi) To vote: Click …

Using the Load and Unload events of the Forms add these subs to handle a simple fade in and out effect. This is not limited to just one form. The subroutine definition can be added to any global class allowing the use on any form or sub-form.