Tutorial by Examples: p

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Guice is a Java library. To use it you have to add a JAR file into the classpath of your Java project. Sample classes Below are several classes for a "Hello, world!" example. An interface of a hello "service": public interface HelloWorldService { public void sayHello(); ...

The scope of a variable in a block { ... }, begins after declaration and ends at the end of the block. If there is nested block, the inner block can hide the scope of a variable which is declared in the outer block. { int x = 100; // ^ // Scope of `x` begins here // } // ...

The border-collapse property applies only to tables (and elements displayed as display: table or inline-table) and sets whether the table borders are collapsed into a single border or detached as in standard HTML. table { border-collapse: separate; /* default */ border-spacing: 2px; /* Only w...

Table showing size and values range of all primitive types: data typenumeric representationrange of valuesdefault valuebooleann/afalse and truefalsebyte8-bit signed-27 to 27 - 10-128 to +127short16-bit signed-215 to 215 - 10-32,768 to +32,767int32-bit signed-231 to 231 - 10-2,147,483,648 to +2,147,...

XHProf is a PHP profiler originally written by Facebook, to provide a more lightweight alternative to XDebug. After installing the xhprof PHP module, profiling can be enabled / disabled from PHP code: xhprof_enable(); doSlowOperation(); $profile_data = xhprof_disable(); The returned array wil...

All variables in powershell begin with a US dollar sign ($). The simplest example of this is: $foo = "bar" This statement allocates a variable called foo with a string value of "bar".

The default scope for a variable is the enclosing container. If outside a script, or other container then the scope is Global. To specify a scope, it is prefixed to the variable name $scope:varname like so: $foo = "Global Scope" function myFunc { $foo = "Function (local) scope&...

Some recommended PEP8 style guidelines for imports: Imports should be on separate lines: from math import sqrt, ceil # Not recommended from math import sqrt # Recommended from math import ceil Order imports as follows at the top of the module: Standard libr...

The typical workflow of training and using neural networks, regardless of the library used, goes like this: Training Data Getting the training data: the X variable is the input, and the Y variable is the output. The simplest thing to do is to learn a logic gate, where X is a vector or two number...

Please read Preventing SQL injection with Parametrized Queries for a complete discussion of why prepared statements help you secure your SQL statements from SQL Injection attacks The $conn variable here is a MySQLi object. See MySQLi connect example for more details. For both examples, we assume t...

The sum 20 + 21 + 22 + ... + 2n-1 simplifies to 2n - 1. This explains why the maximum value that can be stored in an unsigned 32-bit integer is 232 - 1.

In /res/values/strings.xml: <string-array name="spinner_options"> <item>Option 1</item> <item>Option 2</item> <item>Option 3</item> </string-array> In layout XML: <Spinner android:id="@+id/spinnerName" ...

How do you go about using an instance of a (possibly further) inherited generic type within a method declaration in the generic type itself being declared? This is one of the problems you will face when you dig a bit deeper into generics, but still a fairly common one. Assume we have a DataSeries&l...

By default, Eloquent models expect for the primary key to be named 'id'. If that is not your case, you can change the name of your primary key by specifying the $primaryKey property. class Citizen extends Model { protected $primaryKey = 'socialSecurityNo'; // ... } Now, any Eloqu...

$user = User::find(1); $user->name = 'abc'; $user->save(); You can also update multiple attributes at once using update, which does not require using save afterwards: $user = User::find(1); $user->update(['name' => 'abc', 'location' => 'xyz']); You can also update a model(s)...

Comments are programmer-readable annotations that are ignored at runtime. Their purpose is to make source code easier to understand. Single line comments The # character is used to add single line comments. #!/usr/bin/ruby -w # This is a single line comment. puts "Hello World!" Whe...

Const zipCode As Long = 10012 Dim zipCodeText As String 'Convert the zipCode number to a string of digit characters zipCodeText = CStr(zipCode) 'zipCodeText = "10012"

Const zipCode As long = 10012 Dim zeroPaddedNumber As String zeroPaddedZipCode = Format(zipCode, "00000000") 'zeroPaddedNumber = "00010012"

'Declare an array of bytes, assign multi-byte character codes, and convert to a string Dim multiByteChars(9) As Byte multiByteChars(0) = 87 multiByteChars(1) = 0 multiByteChars(2) = 111 multiByteChars(3) = 0 multiByteChars(4) = 114 multiByteChars(5) = 0 multiByteChars(6) = 108 multiByteChar...