In this post Classes and objects in java, belonging to a programming language, its meanings are mentioned, being concepts of interest to readers who are interested in the computing environment.
Classes and objects in java
Java is a programming language and a computing platform that is used in many applications and websites, based on this concept we will see that they are classes and objects in Java. You need to know the basics of object-oriented programming: objects and classes.
We recommend a very appropriate article on the subject How to use java.
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A class represents a series of objects that intervene in a structure and that also behave with similar characteristics. A class is a special combination of attributes and methods, and it is considered as a type of information of any element from its origin.
So, a class is a template or prototype format for objects: it defines the attributes they form in these types of objects and the methods that can be used to manage the objects. The class is where the properties and methods that each of the instances of the objects may contain are definitely described.
In classes you can mention the example of the television, we know that there are different models of televisions and each one has its own characteristics. However, they have a scheme or parameters that characterize the TV, this is known as the class.
Objects
It is the entity existing in the memory of the computer that contains properties, that is, attributes or data of themselves and are archived by the object, and of special available operations.
It can then be defined as a software element that aims to represent an object in a real environment, so that an object has properties and actions to be executed with the object.
The properties and actions are encapsulated within the object, carrying out the principles of encapsulation. The object-oriented prototype looks like a contrast to the structured programming that has been in use since the 60s.
An object has its own state, or states as well as its behavior, which is modeled through properties or variables and methods. In fact, an object can have another type of object at the same time.
What is data encapsulation
The interactions with the objects are carried out through the methods, which means that if you want to know information about the status of the object, you should look for one of the methods and not directly to the properties.
Encapsulations allow modifying the properties of the object without the need for consumers to be affected, as long as they continue to deliver the same product, that is, the result.
Indeed, there are objects that have public properties so they can be entered directly, without having to use a method.
Using objects provides the following benefits:
- Modularity, this means that the object and its properties can be mobilized by different structures of the source code, however the object remains the same.
- Encapsulate Data, it hides the implementation of properties of the object, because it is not entered through the methods of the object.
- Code Reuse, you can get different instances of an object, so that those varied instances share the same code.
- Replacement, which means that one object can be substituted for another, as long as these objects contain the same functionality.
Some examples of objects
Any concept in a real environment can be modeled as an object with its state and operation, for example we have the present case: A television is an object, and the states that compose it: on, off, tuned to channel 1, tuned on channel 2, recording. Now, the actions are: "turn on the television", "turn off the television", "change the channel", "start recording".
We are going to mention another example, we suppose that there is a geometric figure that can be a triangle, this figure can be conceptualized by different properties such as: the base, height, side and the x, y coordinates of the center of the triangle.
If we are going to refer to the triangle method, we can “calculate the area of the triangle”, “calculate the perimeter of the triangle”.
Difference between class and object
A class is a prototype that defines variables and methods, functions common to all objects of some type.
An object is a model of a class, software objects are generally used to model objects in a real environment that exist in everyday life.
Summing up this particular post, it can be said that Class in Java is an entity that determines how an object behaves, in addition to its content. An object is an independent element based on methods and properties to obtain some useful data.
A class system has the function of allowing the program to specify a new class based on a class that already exists.
