Tutorial by Examples: en

Suppose you have a long list of elements and you are only interested in every other element of the list. Perhaps you only want to examine the first or last elements, or a specific range of entries in your list. Python has strong indexing built-in capabilities. Here are some examples of how to achie...

An observable is created from the TextChanged event of the TextBox. Also any input is only selected if it's different from the last input and if there was no input within 0.5 seconds. The output in this example is sent to the console. Observable .FromEventPattern(textBoxInput, "TextChan...

The Notification API specifications support 2 events that can be fired by a Notification. The click event. This event will run when you click on the notification body (excluding the closing X and the Notifications configuration button). Example: notification.onclick = function(event) { ...

import java.awt.EventQueue; import java.awt.GridLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import java.util.ArrayList; import java.util.List; import javax.swing.JFrame; import javax.swing.JTextArea; import javax.sw...

Create a font extension using the IDE. See the iReport or Jaspersoft Studio documentation for details. The font extension can also be created manually. What are font extensions? Using a textElement you can specify a font (if not specified default font SansSerif is used) <textElement> &...

Declare @ObjectName nVarChar(1000) Set @ObjectName = 'HeadOfficeSQL1.Northwind.dbo.Authors' SELECT PARSENAME(@ObjectName, 4) as Server ,PARSENAME(@ObjectName, 3) as DB ,PARSENAME(@ObjectName, 2) as Owner ,PARSENAME(@ObjectName, 1) as Object Returns: ServerDBHeadofficeSQL1NorthwindOwn...

The NotifyPropertyChangedBaseclass below defines a generic Set method that can be called from any derived type. public class NotifyPropertyChangedBase : INotifyPropertyChanged { protected void RaisePropertyChanged([CallerMemberName] string propertyName = null) => PropertyChanged?.Invo...

Erlang on OpenBSD is currently broken on alpha, sparc and hppa architectures. Method 1 - Pre-built Binary Package OpenBSD let you choose desired version you want to install on your system: ###################################################################### # free-choice: ####################...

You can setup your client browser to listen in incoming server events using the EventSource object. You will need to supply the constructor a string of the path to the server' API enpoint the will subscribe the client to the server events. Example: var eventSource = new EventSource("api/my-ev...

An event stream to the server can be closed using the EventSource.close() method var eventSource = new EventSource("api/my-events"); // do things ... eventSource.close(); // you will not receive anymore events from this object The .close() method does nothing is the stream is already...

There are many ways to communicate with servers using Unity as the client (some methodologies are better than others depending on your purpose). First, one must determine the need of the server to be able to effectively send operations to and from the server. For this example, we will send a few pie...

Suppose that we have the following text file: jekyll_hyde.txt How do we convert it to a PDF that looks like this: Note the blue border that is added to the titles, and the page number at the bottom of each page. In iText 5, these elements are added using page events: class MyPageEvents extends ...

Suppose that you have the following text file: jekyll_hyde.txt How do we convert it to a PDF that looks like this: Note the page numbers at the bottom of each page. These are added using an IEventHandler implementation: protected class Footer implements IEventHandler { @Override pub...

Suppose that you have the following text file: jekyll_hyde.txt How do we convert it to a PDF that looks like this: Note that this is very similar to what we had before, but the border of the titles now has rounded corners. We created a custom ParagraphRenderer to achieve this, and we created a T...

In the .bashrc or .bash_profile, adding: export MYSQL_PS1="\u@\h [\d]>" make the MySQL client PROMPT show current user@host [database].

To prevent memory leaks, one should not forget to close an input stream or an output stream whose job is done. This is usually done with a try-catch-finally statement without the catch part: void writeNullBytesToAFile(int count, String filename) throws IOException { FileOutputStream out = null...

You can bind event listeners to the EventSource object to listen to different events channels using the .addEventListener method. EventSource.addEventListener(name: String, callback: Function, [options]) name: The name related to the name of the channel the server is emitting events to. callb...

Save aps.cer to a folder Open "Keychain access" and export the key that is under that certificate to a .p12 file (call it key.p12). To do that right click on it and choose Export. Save it to the same folder as step 1. On export you will be prompted for a password. Make something u...

What is Flink Like Apache Hadoop and Apache Spark, Apache Flink is a community-driven open source framework for distributed Big Data Analytics. Written in Java, Flink has APIs for Scala, Java and Python, allowing for Batch and Real-Time streaming analytics. Requirements a UNIX-like environment,...

JAXB can be used to generate classes from an model defined in XSD. It will then be possible to read XML document made against this XSD directly as java instances and inversly save these instances as XML document. Take the following XSD saved in a file named SimpleModel.xsd <?xml version="...