Tutorial by Examples: i

Generally, it's not a good idea to use a regular expression to parse a complex structure. But it can be done. For instance, you might want to load data into hive table and fields are separated by comma but complex types like array are separated by a "|". Files contain records with all fiel...

The java command supports a wide range of options: All options start with a single hyphen or minus-sign (-): the GNU/Linux convention of using -- for "long" options is not supported. Options must appear before the <classname> or the -jar <jarfile> argument to be recog...

Fluent methods in Kotlin can be the same as Java: fun doSomething() { someOtherAction() return this } But you can also make them more functional by creating an extension function such as: fun <T: Any> T.fluently(func: ()->Unit): T { func() return this } Which the...

The BukkitRunnable is a Runnable found in Bukkit. It's possible to schedule a task directly from a BukkitRunnable, and also cancel it from inside itself. Important: The time on the tasks is measured in Ticks. A second has 20 ticks. Non-RepeatingTask: JavaPlugin plugin; //Your plugin instance ...

Enable the module by typing: sudo a2enmod ssl Restart the web server (apache2) so the change is recognized: sudo service apache2 restart Optional (but a good idea): Create a directory that will contain our new certificate files: sudo mkdir /etc/apache2/ssl Create the key and self-signed ...

Pointers can be dereferenced by adding an asterisk * before a pointer. package main import ( "fmt" ) type Person struct { Name string } func main() { c := new(Person) // returns pointer c.Name = "Catherine" fmt.Println(c.Name) // prints: Cathe...

A question that occasionally on StackOverflow is whether it is appropriate to use assert to validate arguments supplied to a method, or even inputs provided by the user. The simple answer is that it is not appropriate. Better alternatives include: Throwing an IllegalArgumentException using cust...

You can have a config.yml file that loads directly from your jar file. It must be added to your project's folder, the same way as the plugin.yml file is. In this file you have the default values for your configuration. Example config: # This is an YML comment adminName: "Kerooker" mod...

What can happen in your config file is having a path to a variable that goes through multiple sections. Example Config admins: first-tier: "Kerooker" second-tier: "Mordekaiser" third-tier: "Yesh4" The name "Kerooker" is from section "first-tier...

Instead of getting a reference to the DOM you can simply change the index of the tab using the selectedIndex attribute on the ion-tabs HTML: <ion-tabs [selectedIndex]="tabIndex" class="tabs-icon-text" primary > <ion-tab tabIcon="list-box" [root]=&qu...

Sometimes it is needful to backtrack after reading. # identify current position in file, in case the first line isn't a comment my $current_pos = tell; while (my $line = readline $fh) { if ($line =~ /$START_OF_COMMENT_LINE/) { push @names, get_name_from_comment($line); ...

The WMI type provider allows you to query WMI services with strong typing. To output the results of a WMI query as JSON, open FSharp.Management open Newtonsoft.Json // `Local` is based off of the WMI available at localhost. type Local = WmiProvider<"localhost"> let data = ...

Classes implement an interface to meet the interface's contract. For example, a C# class may implement IDisposable, public class Resource : IDisposable { private MustBeDisposed internalResource; public Resource() { internalResource = new MustBeDisposed(); } ...

Function contracts allow the programer to check for inconsistencies. Inconsistencies include invalid parameters, checks for the correct return value or an invalid state of the object. The checks can happen before and after the body of the function or method is executed. void printNotGreaterThan42(...

For example if an method is invoked the state of the object may not allow that a method is called with specific parameters or not at all. class OlderThanEighteen { uint age; final void driveCar() in { assert(age >= 18); // variable must be in range } body { ...

Before running this sample, you must: Download and install the Java SE Development Kit (JDK): Download JDK Download Apache Maven version 3.3.9 or greater: Install and configure Maven for your local development environment.

Test the application using the development web server, which is included with the App Engine SDK. Run the following Maven command from within your helloworld directory, to compile your app and start the development web server: mvn appengine:devserver The web server is now listening for re...

Detailed instructions on getting sybase set up or installed.

Slices are pointers to arrays, with the length of the segment, and its capacity. They behave as pointers, and assigning their value to another slice, will assign the memory address. To copy a slice value to another, use the built-in copy function: func copy(dst, src []Type) int (returns the amount o...

Package fmt implements formatted I/O using format verbs: %v // the value in a default format %T // a Go-syntax representation of the type of the value %s // the uninterpreted bytes of the string or slice Format Functions There are 4 main function types in fmt and several variations w...