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Topic: Method overriding (programming)


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In the News (Wed 30 Dec 09)

  
  Method overriding (programming) - Wikipedia, the free encyclopedia
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.
This means that the subclass's method has the same name, parameter list, and return type as the superclass's overridden method.
Method overriding is an important feature that facilitates polymorphism in the design of object-oriented programs.
en.wikipedia.org /wiki/Method_overriding_(programming)   (427 words)

  
 The Essence of OOP Using Java, Inheritance, Part 2
Method overriding is used to modify the behavior of a method of the Radio class named playStation, to cause that method to behave appropriately when a tape has been inserted into the tape player.
When a method is invoked on a reference to an object, it is the type of the object (and not the type of the variable containing the reference to the object) that is used to determine which version of the method is actually invoked.
Method overriding is used to modify the behavior of an inherited method named playStation to cause that method to behave appropriately when a tape has been inserted into the radio.
www.developer.com /java/other/print.php/957381   (2315 words)

  
 C#, Java, and JavaScript Programming, by Richard G Baldwin
With runtime polymorphism based on method overriding, the decision as to which version of a method will be executed is based on the actual type of the object whose reference is stored in the reference variable or element, and not on the type of the reference variable or element on which the method is invoked.
The decision as to which version of the method to execute is based on the actual type of object whose reference is stored in the reference variable, and not on the type of the reference variable on which the method is invoked.
With runtime polymorphism based on method overriding, the decision as to which version of a method will be executed is based on the actual type of object whose reference is stored in the reference variable, and not on the type of the reference variable on which the method is invoked.
www.dickbaldwin.com /csharp/Cs000120.htm   (3101 words)

  
 Encyclopedia [Definition]
These scholars had an incalculable influence on methods of research and editing, due in part to the Islamic practice of isnadThe isnad (Arabic) are the citations or "backings" that establish the legitimacy of the hadith, which are the sayings of Muhammad, Prophet of Islam.
TV Program format — license to produce and to broadcast a national version of a copyrighted foreign TV program and to use its name...
This method of publishing was common in the 18th and early 19th century and was known as a conger.
www.wikimirror.com /encyclopedia   (13785 words)

  
 Method Overriding   (Site not responding. Last check: 2007-09-11)
A method in a subclass can have the same name, arguments and result type as a method in its superclass.
In this case the method in the subclass is said to override the method in the superclass.
Every call to the method identifier will then invoke the overriding method, even when the static type of a variable is the superclass.
diwww.epfl.ch /~odersky/courses/npj/week1/node19.html   (72 words)

  
 [Chapter 3] 3.7 Overriding Methods   (Site not responding. Last check: 2007-09-11)
When the method is invoked for an object of the class, it is the new definition of the method that is called, not the superclass' old definition.
Method overriding is an important and useful technique in object-oriented programming.
methods that can be invoked directly are also candidates for inlining--i.e., if the methods are short, the compiler may simply insert the method body into the code rather than inserting a call to the method.
dan.sibiu.rdsnet.ro /docs/javanut/ch03_07.htm   (1159 words)

  
 Overriding and Hiding Methods   (Site not responding. Last check: 2007-09-11)
(Remember that a method's signature is its name and the number and the type of its arguments.) The ability of a subclass to override a method allows a class to inherit from a superclass whose behavior is "close enough" and then to modify behavior as needed.
When writing a method that has the same name as a method in a superclass, double check the return values and the argument lists to make sure that you are overloading or overriding as you intended.
For instance methods, the runtime system invokes the method defined in the runtime type of the reference on which the method is called.
java.sun.com /docs/books/tutorial/java/more/override.html   (708 words)

  
 Virtual method protection patent   (Site not responding. Last check: 2007-09-11)
That is, a virtual method may be overwritten in a derived class, even if the method is not accessible or callable in that derived class if permissible by the program constraints.
As a result, the derived virtual method may be permitted if the metadata grants access permissions concerning the virtual method of the programming language.
One or more programs that may utilize the signal processing services of the present invention, e.g., through the use of a data processing API or the like, are preferably implemented in a high level procedural or object oriented programming language to communicate with a computer.
www.freshpatents.com /Virtual-method-protection-dt20050120ptan20050015753.php   (6776 words)

  
 The Programming Language Paradigm/SP
A method itself can contain declarations of other entities (such as constants, types, variables, and other methods) that are private for the enclosing method and cannot be exported.
During program execution a block is activated when a process evaluates a function designator or executes a procedure statement or module.
The distinction between a variable as a syntactic entity in the program text and a class of dynamic entities in memory is usually clear from the context.
www.chapman.edu /~radenski/research/paradigm-sp/docs/lrm.html   (3927 words)

  
 Object-Oriented Programming: A Unified Foundation
Programming language designers and compiler builders struggled with issues like method overriding, multiply inheritance, templates, etc., which bore not much overlap with the features for which theoreticians were developing the underlying theory.
In this appoach, methods are thought to be residing not within the objects, but within the messages.
The rough history of the prograssion of objct-oriented programming languages from Simula to Smalltalk, Eiffel, C++, CLOS, and Java is known.
www.di.ens.fr /~castagna/BOOK/press.html   (1816 words)

  
 M.Sc.I.T. Programming - Tutorial week 10   (Site not responding. Last check: 2007-09-11)
A situation in which a method name can refer to one of a number of different versions of a method implementation in different classes where each implementation does different but equivalent things is called polymorphism.
It is in the case of overriding that we need to use dynamic-binding and to provide polymorphic methods.
This is where your program code will be placed and apart from the name of the class is the only place where the template needs to be changed.
www.csm.uwe.ac.uk /~pcsmarti/uqc839hm/mtut10.htm   (1034 words)

  
 Design with Java: The Sensible Use of Method Overriding: Part 2 - Papurt, LeJacq (ResearchIndex)
Abstract: Introduction This is the second installment in a two part series of columns covering the sensible use of inheritance and method overriding.
As stated in Part 1 [1], experience shows that without concrete guidelines, it is all too easy to misapply inheritance and method overriding.
Automatic up-conversion from descendents into ancestors and polymorphic method selection - which are central to the sensible use of inheritance and method overriding - can produce semantic nonsense and errors when the...
citeseer.ist.psu.edu /477952.html   (389 words)

  
 Pascal to Java   (Site not responding. Last check: 2007-09-11)
This method as the name suggests returns a String representation of an object (the default is like an ID code for an object).
All we do is create a method in the child class with the same name and parameters as the method in the parent class.
This works because when a method is called on an object, the search for which method to execute starts in the actual class of the object, and then moves up to the super-class if it can't find a method with matching name and parameters.
www.cs.otago.ac.nz /cosc244/java_tuts/PascalToJava2.htm   (907 words)

  
 Subclasses and Inheritance (Java in a Nutshell)
One of its uses is to invoke the constructor method of a superclass from within the constructor method of a subclass.
When the method is invoked for an object of the class, it is the new definition of the method that is called, not the superclass's old definition.
Although Java treats the fields and methods of a class analogously in many ways, method overriding is not like field shadowing at all.
alex.mackow.free.fr /books/javaenterprise/jnut/ch03_04.htm   (2708 words)

  
 Object-
The methods in this class are for getting and setting the value of the field (they are 'accessor methods').
In such tables, some members or methods might be inherited from the parent of the parent, or the parent of the parent of the parent...
method that takes an array of String arguments and has no return value is a special method that may be called by the Java Virtual Machine's interpreter to begin execution of a Java program.
www.kinabaloo.com /oo1.html   (1258 words)

  
 Glossary of Computer Terms by Walton Dell (with Tons of Definitions!)
For a file saved in the program to be backward compatible, it must be possible to open the file in a previous version of the program.
It is used to copy or move data from one program to another, or from one area of a document to another.
Some programs allow you to turn individual toolbars on and off (to display or hide them), and you may even be able to customize the toolbar by changing what buttons are shown (or even add your own buttons).
www.wdell.com /glossary   (5699 words)

  
 [No title]   (Site not responding. Last check: 2007-09-11)
(Recall that overloaded methods are methods of the same class that have the same name but different signatures) A method defined in a superclass may be overridden in its subclass to provide a more appropriate implementation for the subclass objects.
If a superclass method is not overridden in a subclass, then the subclass uses the method from its superclass.
If the method is not overridden in the immediate superclass, then the one from that class’ superclass is used, etc., and so on up the class hierarchy.
www.fiu.edu /~shawg/3337/override.doc   (251 words)

  
 overriding method concept from the Java knowledge base   (Site not responding. Last check: 2007-09-11)
then this method overrides the method with the same method signature in the superclass
then the method must have a throws clause that mentions the class of that exception or one of the superclasses of the class of that exception
overrides a method in a superclass with the same name
www.site.uottawa.ca:4321 /java/overridingmethod.html   (373 words)

  
 VB.NET: Inheritance - Overriding the Constructor Method   (Site not responding. Last check: 2007-09-11)
Such a method is called an abstract method or pure virtual function, since it only defines the interface and no implementation.
If we don’t override one of these methods, we’ll generate a syntax error in the subclass and it won’t compile.
If we never intend to reuse the code that implements these methods as we create new classes then the interface approach is fine, but if we want code reuse within subclasses inheritance is the way to go.
www.vbip.com /books/1861004915/chapter_4915_07.asp   (740 words)

  
 [No title]
Polymorphism is the technique by which an object that is used to invoke a method can actually invoke different methods, depending on the nature of the control structure.
Polymorphism is the technique by which an object is used to invoke overridden methods at different times, depending on the nature of the application.
The method signature determines which version of an overridden method is invoked.
www.unf.edu /~jgaudry/Courses/ds/patterns/answers.doc   (844 words)

  
 The Data Center Journal - Glossary   (Site not responding. Last check: 2007-09-11)
CGI programs are executed on the server, normally in response to some input from a web page.
Using an overriding coordinate system so that different sources of geographic data can be referenced to the Earth's surface in the same way.
Program code that is made available for view, reuse and modification by others, normally with no license fee or restrictions on use
www.datacenterjournal.com /Tools/Glossary.asp   (6671 words)

  
 Making The Most Of Your Inheritance   (Site not responding. Last check: 2007-09-11)
While the way things work with fields, methods, and properties is fairly straightforward, the manner in which constructors are inherited brings up issues that are a bit more complex.
Every field, method, and property that is part of the base class definition is inherited by the derived class definition.
Public members are unlike private and protected members in that they add functionality to the programming contract that a derived class exposes to its clients.
www.informit.com /articles/article.asp?p=169107&seqNum=3   (3683 words)

  
 CS712/CS812 Programming Project Part 5   (Site not responding. Last check: 2007-09-11)
Your program will be graded primarily by testing it for correct functionality.
However, you may lose points if your program is not properly structured or adequately documented.
Your programs should be submitted for grading from either hopper or christa.
www.cs.unh.edu /~pjh/courses/cs712/1997/proj5.html   (366 words)

  
 Exceptions to the programming rules, Part 2
dedicates six methods to working with a stack trace -- a sequence of method-call stack frames (where each stack frame describes an incomplete method call) and related source code information that identify the location of code responsible for throwing an exception object.
To describe an exception that originates from a program, such as a failed attempt to write to a file or an attempt to access a nonexistent array element, either the program or the JVM creates an object from a class in that subhierarchy.
Programs must handle checked exceptions because programs can't guarantee such exceptions won't occur.
www.javaworld.com /javaworld/jw-04-2002/jw-0405-java101.html   (2126 words)

  
 CSC - Proceedings: The Origin of Biological Information and the Higher Taxonomic Categories
The scenario has an overriding problem, however: the size of the combinatorial space (i.e., the number of possible amino acid sequences) and the extreme rarity and isolation of the functional sequences within that space of possibilities.
His experimental method improves upon earlier mutagenesis techniques and corrects for several sources of possible estimation error inherent in them.
Moreover, contemporary studies on the method of “inference to the best explanation” have shown that determining which among a set of competing possible explanations constitutes the best depends upon judgments about the causal adequacy, or “causal powers,” of competing explanatory entities (Lipton 1991:32-88).
www.discovery.org /scripts/viewDB/index.php?command=view&id=2177&progr...   (14202 words)

  
 Recall method overriding   (Site not responding. Last check: 2007-09-11)
Recall method overriding in which methods along a class hierarchy have the same name and the same signature, but appear in different classes.
Each of these class definitions provides additional methods, but when a method has the same name and so its “header” or prototype looks the same as one in an earlier class, we say the method is overriden.
Summer 2000 Java Programming [webmaster@lab.privacy.cs.cmu.edu] Last Revised 5/23/00.
privacy.cs.cmu.edu /courses/java/lectures/lecture9/sld076.htm   (94 words)

  
 SCJP Study Notes - Method Overloading, Overriding, Runtime Type, and Object Orientation -1   (Site not responding. Last check: 2007-09-11)
State the benefits of encapsulation in object oriented design and write code that implements tightly encapsulated classes and the relationships "is a" and "has a".
The primitive data types defined in any programming language are in fact abstract data types, albeit not user defined.
All behavior should be accessed only via methods.
www.akgupta.com /Java/Notes/section6-1.htm   (407 words)

  
 The Essence of OOP using Java, Runtime Polymorphism through Inheritance   (Site not responding. Last check: 2007-09-11)
As you gain more experience with Java, you will learn that much of the power of OOP using Java is centered on runtime polymorphism using class inheritance, interfaces, and method overriding.
In an extreme case, for example, the object might be deserialized at runtime from a network connection of which the compiler has no knowledge.
The type of the reference variable must also be a class that either defines or inherits the method that will ultimately be invoked on the object.
www.developer.com /java/other/print.php/983081   (2685 words)

  
 P2P and Human Evolution: Placing Peer to Peer Theory in an Integral Framework, Michel Bauwens
As mass intellectuality increases through formal and informal education, and due to the very requirements of the new types of immaterial work, meaning is no longer sought in the sphere of salaried work, but in life generally, and not through entertainment alone, but through creative expression, through 'work', but outside of the monetary sphere.
The academic peer review method, the setting up of universities which regulate discourse, the birth of professional bodies as guardians of expertise, the scientific method, are but a few of such regulations.
Despite the overriding influence of corporate-owned mass media, groups such as the alterglobalisation movement have succeeded in created a vast number of alternative news outlets, in written, audio, and audiovisual formats.
www.integralworld.net /bauwens2.html   (19692 words)

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