Java And Object Oriented Programming Paradigm By Jana Pdf
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- Method (computer programming)
- A Java-based Electronic Healthcare Record Software for Beta-thalassaemia
- PHI Learning
- C++ And Object Oriented Programming Paradigm
Method (computer programming)
A method in object-oriented programming OOP is a procedure associated with a message and an object. An object consists of data and behavior ; these comprise an interface , which specifies how the object may be utilized by any of its various consumers. Data is represented as properties of the object, and behaviors are represented as methods.
For example, a Window object could have methods such as open and close , while its state whether it is open or closed at any given point in time would be a property. In class-based programming , methods are defined in a class , and objects are instances of a given class. One of the most important capabilities that a method provides is method overriding - the same name e. This allows the sending objects to invoke behaviors and to delegate the implementation of those behaviors to the receiving object.
A method in Java programming sets the behavior of a class object. For example, an object can send an area message to another object and the appropriate formula is invoked whether the receiving object is a rectangle , circle , triangle , etc.
Methods also provide the interface that other classes use to access and modify the properties of an object; this is known as encapsulation. Encapsulation and overriding are the two primary distinguishing features between methods and procedure calls. Method overriding and overloading are two of the most significant ways that a method differs from a conventional procedure or function call. Overriding refers to a subclass redefining the implementation of a method of its superclass. For example, findArea may be a method defined on a shape class.
The various subclasses: rectangle , circle , triangle , etc. The idea is to look at objects as "black boxes" so that changes to the internals of the object can be made with minimal impact on the other objects that use it. This is known as encapsulation and is meant to make code easier to maintain and re-use. Method overloading, on the other hand, refers to differentiating the code used to handle a message based on the parameters of the method.
If one views the receiving object as the first parameter in any method then overriding is just a special case of overloading where the selection is based only on the first argument. Accessor methods are used to read the data values of an object. Mutator methods are used to modify the data of an object. Manager methods are used to initialize and destroy objects of a class, e. These methods provide an abstraction layer that facilitates encapsulation and modularity.
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 for balance retrieval e. The concepts of encapsulation and modularity are not unique to object-oriented programming.
Indeed, in many ways the object-oriented approach is simply the logical extension of previous paradigms such as abstract data types and structured programming.
A constructor is a method that is called at the beginning of an object's lifetime to create and initialize the object, a process called construction or instantiation.
Initialization may include an acquisition of resources. Constructors may have parameters but usually do not return values in most languages. See the following example in Java:. A destructor is a method that is called automatically at the end of an object's lifetime, a process called destruction. Destruction in most languages does not allow destructor method arguments nor return values.
Destruction can be implemented so as to perform cleanup chores and other tasks at object destruction. In garbage-collected languages, such as Java , C , and Python , destructors are known as finalizers. They have a similar purpose and function to destructors, but because of the differences between languages that utilize garbage-collection and languages with manual memory management, the sequence in which they are called is different. An abstract method is one with only a signature and no implementation body.
It is often used to specify that a subclass must provide an implementation of the method. Abstract methods are used to specify interfaces in some programming languages. The following Java code shows an abstract class that needs to be extended:. If a subclass provides an implementation for an abstract method, another subclass can make it abstract again. This is called reabstraction. In C , a virtual method can be overridden with an abstract method.
This also applies to Java, where all non-private methods are virtual. Interfaces' default methods can also be reabstracted, requiring subclasses to implement them. This also applies to Java. Class methods are methods that are called on a class rather than an instance.
They are typically used as part of an object meta-model. Meta-model protocols allow classes to be created and deleted. In this sense, they provide the same functionality as constructors and destructors described above. But in some languages such as the Common Lisp Object System CLOS the meta-model allows the developer to dynamically alter the object model at run time: e. Special methods are very language-specific and a language may support none, some, or all of the special methods defined here.
A language's compiler may automatically generate default special methods or a programmer may be allowed to optionally define special methods. Most special methods cannot be directly called, but rather the compiler generates code to call them at appropriate times. Static methods are meant to be relevant to all the instances of a class rather than to any specific instance. They are similar to static variables in that sense. An example would be a static method to sum the values of all the variables of every instance of a class.
For example, if there were a Product class it might have a static method to compute the average price of all products. This static method has no owning object and does not run on an instance. It receives all information from its arguments. A static method can be invoked even if no instances of the class exist yet. Static methods are called "static" because they are resolved at compile time based on the class they are called on and not dynamically as in the case with instance methods, which are resolved polymorphically based on the runtime type of the object.
Copy-assignment operators define actions to be performed by the compiler when a class object is assigned to a class object of the same type. Operator methods define or redefine operator symbols and define the operations to be performed with the symbol and the associated method parameters.
Some procedural languages were extended with object-oriented capabilities to leverage the large skill sets and legacy code for those languages but still provide the benefits of object-oriented development.
Non-virtual member functions , or regular methods , are those that do not participate in polymorphism. From Wikipedia, the free encyclopedia. Computer function or subroutine that is tied to a particular instance or class. Oracle Corporation. Retrieved 13 December Retrieved Overloaded methods are multiple methods in the same class that shares the same name but have different parameter lists. Overloaded methods cannot have the same parameter lists with different return types.
Object-Oriented Software Construction. Oracle Java Documentation. Retrieved 11 December Prentice Hall. PHI Learning Pvt. Sengupta, Probal 1 August Svenk, Goran Cengage Learning. Balagurusamy Tata McGraw-Hill Education. Kirch-Prinz, Ulla; Prinz, Peter Conger, David New Riders. Skinner, M. Silicon Press. Love 1 September Linux Kernel Development. Pearson Education. Categories : Method computer programming. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file.
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A Java-based Electronic Healthcare Record Software for Beta-thalassaemia
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Thoma 17, , Athens, Greece. Beta-thalassaemia is a hereditary disease, the prevalence of which is high in persons of Mediterranean, African, and Southeast Asian ancestry. In Greece it constitutes an important public health problem. Beta-thalassaemia necessitates continuous and complicated health care procedures such as daily chelation; biweekly transfusions; and periodic cardiology, endocrinology, and hepatology evaluations. Typically, different care items are offered in different, often-distant, health care units, which leads to increased patient mobility. This is especially true in rural areas.
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C++ And Object Oriented Programming Paradigm
The object oriented programming has some of the following characteristics related to objects: Everything is an object. An object stores data. PHI Learning Pvt. ISBN Sengupta, Probal 1 August Svenk, Goran James P.
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