Example of encapsulated class code in Java language

In the object-oriented programming method, encapsulation refers to a method of packaging and hiding the implementation details of the abstract function interface. The data is protected internally, the internal implementation details are hidden, and the external interface and external interaction are provided.

To use encapsulation

Use the keyword private to modify all attributes of the class and make them private. External classes are not allowed to directly access and generate or provide public setter / getter methods to operate these hidden attributes. Add logic control to the setter / getter methods of the class to ensure the effectiveness and security of data access

Let's take a look at an example of a Java encapsulated class:

In the above example, the public method is the entry for an external class to access its member variables.

In general, these methods are called getter and setter methods.

Therefore, any class that wants to access private member variables in the class must pass through these getter and setter methods.

The following example illustrates how the variables of encaptest class are accessed:

The compilation and operation results of the above code are as follows:

Benefits of using encapsulation

1. Good packaging can reduce coupling

2. The structure inside the class can be modified freely.

3. You can have more precise control over members.

4. Hide information and realize details

summary

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