|
In object-oriented programming, the term method refers to a subroutine that is exclusively associated either with a class (called class methods, static methods, or factory methods) or with an object (called instance methods). Like a procedure in procedural programming languages, a method usually consists of a sequence of statements to perform an action, a set of input parameters to customize those actions, and possibly an output value (called return value) of some kind. The purpose of methods is to provide a mechanism for accessing (for both reading and writing) the private data stored in an object or a class. Image File history File links This is a lossless scalable vector image. ...
Object-oriented programming (OOP) is a programming paradigm that uses objects to design applications and computer programs. ...
In computer science, a subroutine (function, method, procedure, or subprogram) is a portion of code within a larger program, which performs a specific task and is relatively independent of the remaining code. ...
In object-oriented programming, a class is a programming language construct that is used to group related instance variables and methods. ...
In strictly mathematical branches of computer science the term object is used in a purely mathematical sense to refer to any thing. While this interpretation is useful in the discussion of abstract theory, it is not concrete enough to serve as a primitive datatype in the discussion of more concrete...
Procedural programming is a programming paradigm based upon the concept of the modularity and scope of program code (i. ...
A statement is the minimal unit of structuring in imperative programming languages. ...
This article needs cleanup. ...
Kinds of methods
As stated above, instance methods are associated with a particular object, while class or static methods are instead associated with a class. In all typical implementations, instance methods are passed a hidden reference (e.g. this or self or Me) to the object (whether a class or class instance) they belong to, so that they can access the data associated with it. For class/static methods this may or may not happen according to the language; methods of this kind are usually called class methods in languages where they also get a reference to the class itself (as this or self or Me), and static in languages where they don't. A typical example of a class method would be one that keeps count of the number of created objects within a given class. In general, a reference is something that refers to or designates something else, or acts as a connection or a link between two things. ...
In many object-oriented programming languages, this (or self) is a keyword which is used to refer to the object on which the currently executing method has been invoked. ...
In many object-oriented programming languages, this (or self) is a keyword which can be used in instance methods to refer to the object on which the currently executing method has been invoked. ...
In many object-oriented programming languages, this (or self) is a keyword which is used to refer to the object on which the currently executing method has been invoked. ...
In many object-oriented programming languages, this (or self) is a keyword which can be used in instance methods to refer to the object on which the currently executing method has been invoked. ...
An abstract method is a dummy code method which has no implementation. It is often used as a placeholder to be overridden later by a subclass of or an object prototyped from the one that implements the abstract method. In this way, abstract methods help to partially specify a framework. In computer programming, dummy code is inserted in a program skeleton to simulate processing and avoid compilation error messages. ...
Look up Implementation in Wiktionary, the free dictionary. ...
Method overriding, in object oriented programming, is a language feature that allows a subclass to provide a specific implementation of a method that is already provided by one of its superclasses. ...
Look up Framework in Wiktionary, the free dictionary. ...
An accessor method is a method that is usually small, simple and provides the means for the state of an object to be accessed from other parts of a program. Although it introduces a new dependency, use of the methods are preferred to directly accessing state data because they provide an abstraction layer. For example, if a bank-account class provides a getBalance() accessor method to retrieve the current balance (rather than directly accessing the balance data fields), then later revisions of the same code can implement a more complex mechanism balance retrieval (say, a database fetch) without the dependent code needing to be changed. An accessor method that changes the state of an object is called an update method, a modifier method, or a mutator method. Objects that provide such methods are considered mutable objects. A state is a political association with effective dominion over a geographic area. ...
In computer science, dependency or coupling is the degree to which each program module relies on each other module. ...
An abstraction layer is a way of hiding the implementation details of a particular set of functionality. ...
For meanings of the word balance, see: Look up balance in Wiktionary, the free dictionary. ...
Look up Revision in Wiktionary, the free dictionary. ...
This article does not cite any references or sources. ...
In computer science the mutator method is a method that changes the value of the argument variables. ...
In computer science, an immutable object, as opposed to a mutable object, is a kind of object whose internal states cannot be modified. ...
Some languages have a special syntax for Constructors, i.e. methods that are called automatically upon the creation of an instance of a class. In Java, C++, C#, ActionScript, and PHP they are distinguished by having the same name as the class of the object they're associated with (PHP 5 also allows __construct as a constructor); in Visual Basic the constructor is called New, and in Object Pascal constructors can have user-defined names (but are mostly called Create). Under Objective-C the constructor method is split between two methods, alloc and init, with the alloc method setting aside memory for an instance of the class and the init method handling the bulk of initializing the instance; a call to the new method invokes both the alloc and the init method for the class instance. In object-oriented programming, a constructor (sometimes shortened to ctor) in a class is a special block of statements called when an object is created, either when it is declared (statically constructed on the stack, possible in C++ but not in Java and other object-oriented languages) or dynamically constructed...
In computer science, the object lifetime (or life cycle) of an object in object-oriented programming is the time between an objects creation (also known as instantiation or construction) till the object is no longer used, and is destructed or freed. ...
Java is a programming language originally developed by Sun Microsystems and released in 1995. ...
C++ (pronounced see plus plus, IPA: ) is a general-purpose programming language with high-level and low-level capabilities. ...
The title given to this article is incorrect due to technical limitations. ...
ActionScript is a scripting language based on ECMAScript, used primarily for the development of websites and software using the Adobe Flash Player platform (in the form of SWF files embedded into Web pages). ...
PHP is a reflective programming language originally designed for producing dynamic web pages. ...
Visual Basic (VB) is an event driven programming language and associated development environment from Microsoft for its COM programming model. ...
Object Pascal is an object oriented derivative of Pascal mostly known as the primary programming language of Borland Delphi. ...
Objective-C, often referred to as ObjC or more seldomly as Objective C or Obj-C, is an object oriented programming language implemented as an extension to C. It is used primarily on Mac OS X and GNUstep, two environments based on the OpenStep standard, and is the primary language...
Likewise, some languages have special Destructor methods, i.e. instance methods that are called automatically upon the destruction of an instance of a class. In C++, they are distinguished by having the same name as the class of the object they're associated with, but with the addition of a tilde (~) in front. In Object Pascal destructors can have user-defined names (but are mostly called Destroy). Under Objective-C the destructor method is named dealloc. In object-oriented programming, a destructor (sometimes shortened to dtor) is a method which is automatically invoked when the object is destroyed. ...
In computer science, the object lifetime (or life cycle) of an object in object-oriented programming is the time between an objects creation (also known as instantiation or construction) till the object is no longer used, and is destructed or freed. ...
The tilde (~) is a grapheme with several uses. ...
Object Pascal is an object oriented derivative of Pascal mostly known as the primary programming language of Borland Delphi. ...
Objective-C, often referred to as ObjC or more seldomly as Objective C or Obj-C, is an object oriented programming language implemented as an extension to C. It is used primarily on Mac OS X and GNUstep, two environments based on the OpenStep standard, and is the primary language...
Isolation levels Whereas a C programmer might push a value onto a stack data-structure by calling: C is a general-purpose, block structured, procedural, imperative computer programming language developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system. ...
A programmer or software developer is someone who programs computers, that is, one who writes computer software. ...
Simple representation of a stack In computer science, a stack is a temporary abstract data type and data structure based on the principle of Last In First Out (LIFO). ...
stackPush(&myStack, value); a C++ programmer would write: C++ (pronounced see plus plus, IPA: ) is a general-purpose programming language with high-level and low-level capabilities. ...
myStack.push(value); The difference is the required level of isolation. In C, the stackPush procedure could be in the same source file as the rest of the program and if it was, any other pieces of the program in that source file could see and modify all of the low level details of how the stack was implemented, completely bypassing the intended interface. In C++, regardless of where the class is placed, only the functions which are part of myStack will be able to get access to those low-level details without going through the formal interface functions. Languages such as C can provide comparable levels of protection by using different source files and not providing external linkage to the private parts of the stack implementation but this is less neat and systematic than the more cohesive and enforced isolation of the C++ approach. In database systems, isolation is a property that the changes made by an operation are not visible to other simultaneous operations on the system until its completion. ...
An interface defines the communication boundary between two entities, such as a piece of software, a hardware device, or a user. ...
Source code (commonly just source or code) is any series of statements written in some human-readable computer programming language. ...
Some recommended usages A method should preserve the class invariants of the object it is associated with, and should always assume that they are valid when it commences execution. To this effect, preconditions are used to constrain the method's parameters, and postconditions to constrain method's output, if it has one. If any one of either the preconditions or postconditions is not met, a method may raise an exception. If the object's state does not satisfy its class invariants on entry to or exit from any method, the program is considered to have a bug. In computer programming, a class invariant is an invariant used to constrain objects of a class. ...
In logic a precondition is a condition that has to be met, before a main argument can have any value. ...
A postcondition is a fact that must always be true just after the execution of some section of code. ...
Exception handling is a programming language construct or computer hardware mechanism designed to handle the occurrence of some condition that changes the normal flow of execution. ...
A software bug is an error, flaw, mistake, failure, or fault in a computer program that prevents it from behaving as intended (e. ...
The difference between a procedure and a method is that the latter, being associated with a particular object, may access or modify the data private to that object in a way consistent with the intended behavior of the object. Consequently, rather than thinking "a method is just a sequence of commands", a programmer using an object-oriented language will consider a method to be "an object's way of providing a service" (its "method of doing the job", hence the name); a method call is thus considered to be a request to an object to perform some task. In computer science, a subroutine (function, method, procedure, or subprogram) is a portion of code within a larger program, which performs a specific task and is relatively independent of the remaining code. ...
Wikibooks has more about this subject: Marketing In economics and marketing, a service is the non-material equivalent of a good. ...
In common language, a task is part of a set of actions which accomplish a job; the sense is that useful work is getting done. Task analysis is the analysis or a breakdown of exactly how a task is accomplished, such as what sub-tasks are required. ...
Consequently, method calls are often modeled as a means of passing a message to an object. Rather than directly performing an operation on an object, a message (most of the time accompanied by parameters) is sent to the object telling it what it should do. The object either complies or raises an exception describing why it cannot do so. Applied to our stack example, rather than pushing a value onto the stack, a value is sent to the stack, along with the message "Push!". In computer science, message passing is a form of communication used in concurrent programming, parallel programming, object-oriented programming, and interprocess communication. ...
Static methods As mentioned above, a method may be declared as static (or shared in Visual Basic), meaning that it acts at the class level rather than at the instance level. However, a static method cannot refer to a specific instance of the class (i.e. it cannot refer to this, self, Me, etc.) An example of a static member and its consumption in C# code: The title given to this article is incorrect due to technical limitations. ...
public class ExampleClass { public static void StaticExample() { // static method code } public void InstanceExample() { // instance method code here // can use THIS } } /// Consumer of the above class: // Static method is called -- no instance is involved ExampleClass.StaticExample(); // Instance method is called ExampleClass objMyExample = new ExampleClass(); objMyExample.InstanceExample(); Confusingly, methods marked as class in Object Pascal also cannot refer to a class object, as can class methods in Python or Smalltalk. For example, this Python method can create an instance of Dict or of any subclass of it, because it receives a reference to a class object as this: Python is a high-level programming language first released by Guido van Rossum in 1991. ...
Smalltalk is a dynamically typed object oriented programming language designed at Xerox PARC by Alan Kay, Dan Ingalls, Ted Kaehler, Adele Goldberg, and others during the 1970s. ...
class Dict: @classmethod def fromkeys(this, iterable, value=None): d = this() for key in iterable: d[key] = value return d
See also |
Feeds |
Contact