Tutorial by Examples: le

Compile time processing using annotation processor

This example demonstrates how to do compile time checking of an annotated element. The annotation The @Setter annotation is a marker can be applied to methods. The annotation will be discarded during compilation not be available afterwards. package annotation; import java.lang.annotation.Eleme...

Java Language • Annotations

Break a string up into substrings all of a known length

The trick is to use a look-behind with the regex \G, which means "end of previous match": String[] parts = str.split("(?<=\\G.{8})"); The regex matches 8 characters after the end of the last match. Since in this case the match is zero-width, we could more simply say "...

Java Language • Splitting a string into fixed length parts

Break a string up into substrings all of variable length

Same as the known length example, but insert the length into regex: int length = 5; String[] parts = str.split("(?<=\\G.{" + length + "})");

Java Language • Splitting a string into fixed length parts

BooleanQuery

BooleanQuery is used to combine other queries. They can be combined using three BooleanClause.Occur parameters: BooleanClause.Occur.MUST - The subquery must be matched. BooleanClause.Occur.SHOULD - The subquery may not be matched, but will be scored more highly if it is. If there are no MUST...

lucene • Queries

Single TextView with two different colors

Colored text can be created by passing the text and a font color name to the following function: private String getColoredSpanned(String text, String color) { String input = "<font color=" + color + ">" + text + "</font>"; return input; } The ...

Android • TextView

C-Style Unions in C#

Union types are used in several languages, like C-language, to contain several different types which can "overlap". In other words, they might contain different fields all of which start at the same memory offset, even when they might have different lengths and types. This has the benef...

C# Language • How to use C# Structs to create a Union type (Similar to C Unions)

Simple Progress reporting

IProgress<T> can be used to report progress of some procedure to another procedure. This example shows how you can create a basic method that reports its progress. void Main() { IProgress<int> p = new Progress<int>(progress => { Console.WriteLine("Runni...

.NET Framework • Using Progress and IProgress

Commenting table definitions

CREATE TABLE menagerie.bird ( bird_id INT NOT NULL AUTO_INCREMENT, species VARCHAR(300) DEFAULT NULL COMMENT 'You can include genus, but never subspecies.', INDEX idx_species (species) COMMENT 'We must search on species often.', PRIMARY KEY (bird_id) ) ENGINE=InnoDB COMMENT 'Thi...

MySQL • Comment Mysql

Writing a Simple Test

Unit tests are declared in the test/runtests.jl file in a package. Typically, this file begins using MyModule using Base.Test The basic unit of testing is the @test macro. This macro is like an assertion of sorts. Any boolean expression can be tested in the @test macro: @test 1 + 1 == 2 @test...

Julia Language • Unit Testing

List Assignment of Multiple Variables

Powershell allows multiple assignment of variables and treats almost everything like an array or list. This means that instead of doing something like this: $input = "foo.bar.baz" $parts = $input.Split(".") $foo = $parts[0] $bar = $parts[1] $baz = $parts[2] You can simply...

PowerShell • Variables in PowerShell

Windows environment variables are visible as a PS drive called Env:

You can see list with all environment variables with: Get-Childitem env:

PowerShell • Environment Variables

Instant call of Environment Variables with $env:

$env:COMPUTERNAME

PowerShell • Environment Variables

Create an basic profile

A PowerShell profile is used to load user defined variables and functions automatically. PowerShell profiles are not automatically created for users. To create a PowerShell profile C:>New-Item -ItemType File $profile. If you are in ISE you can use the built in editor C:>psEdit $profile An ...

PowerShell • Powershell profiles

A basic example illustrating expression templates

An expression template is a compile-time optimization technique used mostly in scientific computing. It's main purpose is to avoid unnecessary temporaries and optimize loop calculations using a single pass (typically when performing operations on numerical aggregates). Expression templates were init...

C++ • Expression templates

Example

HTML HEAD  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css" /> <script src="https://code.jquery.com/jquery-1.12.4.js" type="text/javascript"></script> <script src="https://co...

datepicker • How to update second datepicker from first datepicker and value of dropdown field

Group a collection of test classes in a test suite

You can organize the execution of your instrumented unit tests defining a Suite. /** * Runs all unit tests. */ @RunWith(Suite.class) @Suite.SuiteClasses({MyTest1.class , MyTest2.class, MyTest3.class}) public class AndroidTestSuite {} Then in AndroidStudio you can run...

Android • Testing UI with Espresso

Simple D3 Chart: Hello World!

Paste this code into an empty HTML file and run it in your browser. <!DOCTYPE html> <body> <script src="https://d3js.org/d3.v4.js"></script>  <script> //This code will visualize a data set as a simple scatt...

d3.js • Getting started with d3.js

Open dialer example

If the web page a contains phone number you can make a call using your phone's dialer. This code checks for the url which starts with tel: then make an intent to open dialer and you can make a call to the clicked phone number: public boolean shouldOverrideUrlLoading(WebView view, String url) { ...

Android • WebView

Viewing Examples

Show usage examples for a specific cmdlet. Get-Help Get-Command -Examples

PowerShell • Using the Help System

Simple Application Object example: Minimize the Excel window

This code uses the top level Application object to minimize the main Excel window. Sub MinimizeExcel() Application.WindowState = xlMinimized End Sub

excel-vba • Application object