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This article introduces the relevant knowledge of "what applications are there for the Object of the web front end". In the actual case operation process, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

Object is often used to mimic objects around us in the real world. A software object is actually a model of a real-world object because it also has state and behavior. A software object uses one or more variables to maintain its state. A variable is a data item named by a user identifier. A software object uses its methods to perform its behavior. Methods are functions (subroutines) associated with objects.

object Meaning of object

Objects are the key to understanding object-oriented technology. Users can look at real-life objects such as dogs, tables, televisions, bicycles, etc. before learning. Users can discover that real-world objects have two characteristics in common: they all have states and behaviors. For example, dogs have their own states (such as names, colors, fertility, hunger, etc.) and behaviors (such as tail wagging, etc.). Bicycles also have their own states (current gear, two wheels, etc.) and behaviors (braking, accelerating, decelerating, changing gears, etc.).

Application of object

You can use software objects to represent real-world objects. You might want to represent real-world dogs with an animated program, or real-world bicycles with programs that control electronic bicycles. You can also use software objects to model abstract concepts. For example, an event is a common object used in GUI windowing systems that represents a user's reaction to pressing a mouse button or a key on a keyboard.

Both the state and behavior of software objects can be expressed in terms of variables and methods within the object. A software object that constructs a real-world bicycle has variables that indicate the current state of the bicycle: speed is 20 mph, and its current gear is third gear. These variables are known as instance variables because they contain state for a particular bicycle object, and in object-oriented technology, a particular object is called an instance. As shown in FIG. 2, the bicycle model is a software object. In addition to variables, software bikes also have methods for braking, pedaling, and shifting gears. These methods are well known instance methods because they check or change the state of a particular bicycle instance.

The object diagram above shows that the variables of the object make up the center part. Methods surround variables and hide the object's core from other objects in the program. A variable that wraps an object in a way that protects a method is called encapsulation. This object graph is the ideal representation of objects and the ultimate goal of object-oriented system designers. However, this is not the whole story. Often, for some practical reason, an object may expose some of its variables or hide some of its methods. In JAVA, an object can specify one of four access levels for variables and methods. This access hierarchy determines which objects and classes can access variables or methods.

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