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C# is a language in which the null object pattern can be properly implemented. This example shows animal objects that display sounds and a NullAnimal instance used in place of the C# null keyword. The null object provides consistent behaviour and prevents a runtime null reference exception that would occur if the C# null keyword were used instead.
A reactor object provides an asynchronous interface to resources that must be handled synchronously. Yes — Read-write lock: Allows concurrent read access to an object, but requires exclusive access for write operations. An underlying semaphore might be used for writing, and a Copy-on-write mechanism may or may not be used. No — Scheduler
The if–then or if–then–else construction is used in many programming languages. Although the syntax varies from language to language, the basic structure (in pseudocode form) looks like this: If (Boolean condition) Then (consequent) Else (alternative) End If. For example: If stock=0 Then message= order new stock Else message= there is ...
The computer graphics pipeline, also known as the rendering pipeline, or graphics pipeline, is a framework within computer graphics that outlines the necessary procedures for transforming a three-dimensional (3D) scene into a two-dimensional (2D) representation on a screen. [1]
The original Visual Objects project (code-named Aspen) was started as part of Nantucket's attempts to bring the Clipper language to Windows, and move from the procedural to the object-oriented style. It also converted Clipper from a p-code system to being a true native compiler and introduced more elements of the C language (such as typed ...
The version of a method that is executed will be determined by the object that is used to invoke it. If an object of a parent class is used to invoke the method, then the version in the parent class will be executed, but if an object of the subclass is used to invoke the method, then the version in the child class will be executed. [3]
Mono is a project led by Xamarin (formerly by Ximian, then Novell) to create an Ecma standard compliant .NET Framework compatible set of tools. In 2011, Mono 's support for System.Windows.Forms as of .NET 2.0 was announced as complete; [ 18 ] System.Windows.Forms 2.0 works natively on Mac OS X. [ 19 ] However, System.Windows.Forms has not been ...
NetBeans GUI builder. A graphical user interface builder (or GUI builder), also known as GUI designer or sometimes RAD IDE, is a software development tool that simplifies the creation of GUIs by allowing the designer to arrange graphical control elements (often called widgets) using a drag-and-drop WYSIWYG editor.