What does object-oriented programming mean?

What Object-Oriented Programming Means

Object-oriented programming is the process of abstract thought embodied in the creation of models and object-oriented methods. The meaning of an object is a concrete thing, i.e., something that can be seen and touched in real life.

In object-oriented programming, an object refers to a component of a computer system. In object-oriented programming, an object has two meanings, one of which is data and the other is action. An object is a combination of data and action. Objects are not only capable of performing actions, but they are also capable of recording the results of the actions in a timely manner.

Methods are the operations that an object can perform, and methods also have another name, called functions. Methods are defined functions in a class whose specific role is to describe operations on objects.

Features

(1) Object uniqueness.

Each object has its own unique identification, through which the corresponding object can be found. Throughout the life of the object, its identity does not change and different objects cannot have the same identity.

(2) Abstraction.

Abstractness is the abstraction of objects with consistent data structures (attributes) and behavior (operations) into classes. A class is such an abstraction that it reflects important properties relevant to the application and ignores some other irrelevant content. Any class delineation is subjective, but must be relevant to the specific application.

(3) Inheritance.

Inheritance is the mechanism by which subclasses automatically share the data structures and methods of the parent class, which is a relationship between classes. When defining and implementing a class, it is possible to build on top of a pre-existing class, taking what is defined by this pre-existing class as your own and adding several new elements.

What does object-oriented programming mean

Object-oriented programming, also known as OOP, is a computer programming architecture. It is essentially an abstract thought process and object-oriented approach embodied in modeling.

One of the basic principles of OOP is that a computer program consists of a combination of individual units or objects that can act as subroutines.OOP achieves the three main goals of software engineering: reusability, flexibility, and extensibility.OOP=Objects+Classes+Inheritance+Polymorphism+Messages, in which the core concepts are classes and objects.

Object Oriented Programming (OOP) is a methodology that simulates the human mindset as much as possible, making the software development method and process as close as possible to the human way of understanding the world and solving real-world problems, i.e., it allows for the description of the problem space and the solution space of the problem to be as consistent as possible in terms of structure, and abstracts the entities in the objective world as objects in the problem domain.

What is object-oriented programming?

In my understanding, object orientation is a natural extension of the real-world model, which is an “everything is an object” approach to programming. Any object in real life can be categorized as a class of things, and every individual is an instance of a class of things. Object-oriented programming is object-centered, message-driven, so the program = object + message.

Object oriented has three main characteristics, encapsulation, inheritance and polymorphism.

Encapsulation is the abstraction of the attributes and behaviors of a class of things into a single class, making the attributes private and the behaviors public, improving the secrecy of the data while making the code modular. This makes the code more reusable.

Inheritance further abstracts the attributes and behaviors common to a class into a parent class, and each subclass is a special parent class — with the behaviors and attributes of the parent class, as well as behaviors and attributes unique to itself. Doing so extends already existing blocks of code and further increases code reusability.

If encapsulation and inheritance are about enabling code reuse, polymorphism is about enabling interface reuse. One of the major roles of polymorphism is for decoupling – for decoupling the parent-child class inheritance. If the relationship between parent and child classes in inheritance is IS-A, then the relationship between interfaces and implementation classes is HAS-A. Simply put, polymorphism is to allow parent class references (or interfaces) to point to subclasses (or implementations) of objects. Many design patterns are based on object-oriented polymorphism.

To summarize, if encapsulation and inheritance are the foundation of object-oriented, then polymorphism is the most essential theory of object-oriented. To master polymorphism must first understand the interface, only a full understanding of the interface in order to better apply polymorphism.

What is Object-Oriented Programming

What we often refer to as “objects” generally refers to methods of solving problems encountered in the field of information. In particular, the application of software technology to solve problems. As we often encounter object-oriented programming (Object-OrientedProgramming), object-oriented analysis (Object-OrientedAnalysis), object-oriented design (Object-OrientedDesign) and so on. These issues can be further analyzed by applying the previously introduced concepts about objects. When dealing with more complex systems, we can analyze it as an object. A system (a complete solution to a problem) as an object can consist of multiple parts. Similarly, this object can be composed of multiple objects. For things of the same kind, they can be represented by a single object. The benefits of this are obvious; it is flexible and efficient and can greatly reduce the workload of designers and simplify the actual modeling. An example. In the design of a relational database, we can treat a tuple as an object and define a set of operation methods for it. These methods will apply to all tuples, so that we do not have to consider different tuples (such as determining the legitimacy of an element) in a larger context: because they have a common set of methods oriented towards themselves, they “solve” their own problems “by themselves”. their own problems. A higher-level object could be a table, a view, etc. The table object is based on the tuple object. Table objects have their own methods based on tuple objects, such as add, delete, etc. At this level, it also has its own methods. At this level, it only needs to do its own thing, because with the support of the tuple object, it doesn’t have to think about things like whether an element is legal or not. Sometimes we can even treat elements or groups of tables as objects and define their own methods to satisfy our needs. In this way, the advantages of object-orientation are even more apparent.

What is meant by Object-Oriented Programming

ObjectOriented (OOP) programming is an approach to software design and development. Computer software design through the method of understanding and abstracting the real world.

What is Object-Oriented Programming

Object-Oriented Programming (OOP for short) aims to create software reusable code with the ability to better simulate real-world environments, which has led to it being recognized as a superior form of top-down programming. It “encapsulates” functions into the “objects” necessary for programming by adding extension statements to the program. Object-oriented programming languages make complex tasks clear and easy to write. It is a revolution, not for the objects themselves, but for their ability to handle work. Objects are not compatible with traditional methods of programming and programming, and being partially object-oriented can make things worse. Unless the entire development environment is object-oriented, objects don’t produce nearly as much good as they cause trouble. Some may argue that PHP is not a true object-oriented programming language; PHP is a hybrid language, and you can use object-oriented programming as well as traditional procedural programming. However, for the development of large projects, you may want to need to use pure object-oriented programming in PHP to declare classes, and only use objects and classes in your project development. As the project gets larger, it may be helpful to use object-oriented programming. Object-oriented programming code is easy to maintain, easy to understand, and easy to reuse; these are the foundations of software engineering. Applying these concepts in Web-based projects becomes the key to future Web site success.

An object is an abstraction of something in the problem or realization domain that reflects the information to be stored and the role to be played by that thing in the system; it is an encapsulation of a set of attributes and a set of services that have the right to operate on those attributes. About the object to be understood from two aspects: on the one hand, refers to the system to deal with the real world objects; on the other hand, the object is the computer does not directly deal with the object, but to deal with the corresponding computer representation, this computer representation is also known as the object. Simply put, a person is an object, a ruler can also be said to be an object. When these objects can be directly represented by data, we call him an attribute. The unit of measure of a ruler can be centimeters, meters or feet, and this unit of measure is the attribute of the ruler.

In PHP we can define a class, a class is a collection of variables and functions that use those variables.PHP is a loosely typed language, so overloading by type doesn’t work, nor does overloading by a different number of arguments. Sometimes it’s good to overload constructors in the middle so that you can create objects in different ways (by passing a different number of arguments). In PHP this is done through classes.

Information encapsulation is done through classes in PHP, and the syntax for defining a class in PHP is:

<?php

classClass_name/// In object oriented programming classes, it is customary for the first character of the class to be uppercase, and must conform to the naming convention for variables.

{

// A collection of functions and variables

}

? >

You can define classes in your preferred format, but it’s better to maintain a standard so that development is more efficient.

Data members are defined in the class using the “var” declaration, and are untyped until assigned a value. A data member can be an integer, an array, an AssociativeArray or an object.

Here’s a real-world example of a class definition:

<?php

classStudent

{

var$str_Name;//Name

var$str_Sex;//Gender

var$int_Id;// School Number

var$int_English;//English Grade

var$int_maths;//Maths Grade

}

? >

This is a simple example of a very common class definition for displaying a student’s academic performance. The class name is Student, and the Student class encompasses the basic attributes of a student: name, gender, student number, English grade, and math grade.

function is what we call a function that is defined in a class. To access a class member variable in a function, you should use $this->var_name, where var_name refers to the variable that is declared in the class, otherwise it would only be a local variable for a function. Let’s start by defining an Input() function to assign initial values to the objects in the instance:

functionInput($Name,$Sex,$Id,$Englis,$Maths)

{

$this->str_Name=$Name;

$this->str_Sex=$Sex;

$this->int_Id=$Id;

$this->int_Englis=$English;

$this->int_Maths=$Maths;

}

Now let’s define a function called “ShowInfo()” that prints the student’s basic information:

functionShowInfo()//define the ShowInfo() function

{

echo( “Name: $this->str_Name<br>

“);

echo(“Gender: $this->str_Sex<br>

“);

echo(“Student ID: $this->int_Id<br>

“);

echo(“English Grade: $this-&gt ;int_English<br>

“);

echo(“Math score: $this->int_Maths<br>

“);

< p>}

A defined class, on the other hand, must use the new keyword to generate the object:

$A_student=newStudent;

For example, if we want to create an instance of an object named $Wing and assign it a value, we can use the following code:

$Wing= newStudent;//generate the object with the new keyword

$Wing->Input(“Wing”, “Male”,33,95,87);

//Enter the respective Wing’s name, gender, student number, English grade, math grade, where name and gender are character variables, so you need to use double quotes, and other numeric variables do not need.

With this complete source code, we can clearly see how classes are used in PHP:

<?php

classStudent

{

var$str_Name;

var$str_Sex;

< p>var$int_Id;

var$int_English;

var$int_maths;

functionInput($Name,$Sex,$Id,$English,$Maths)

{

$this- >str_Name=$Name;

$this->str_Sex=$Sex;

$this->int_Id=$Id;

$this->int_English=$English;

$this-& gt;int_Maths=$Maths;

}

functionShowInfo()

{

echo(“Name: $this->str_Name<br>

“);

echo(“Gender: $this->str_Sex<br>

“);

echo(“Student number: $this-&gt. int_Id<br>

“);

echo(“English grade: $this->int_English<br>

“);

echo(“Math score: $this->int_Maths<br>

“);

}

}

$Wing=newStudent;

$Wing-&gt ;Input(“Wing”, “Male”,33,95,87);

$Paladin=newStudent;

$Paladin->Input( “paladin”, “Female”,38,58,59.5);

$Wing->ShowInfo();

$Paladin->ShowInfo ();