Access scope意思
"Access scope" is a term used in programming and software development, particularly in the context of object-oriented programming (OOP). It refers to the visibility or accessibility of an entity within a program, such as a variable, function, or class.
In OOP, access scope (also known as access specifier or access modifier) determines the level of access that other parts of the program have to the entity. There are typically three to four levels of access scope:
- Public: Entities declared as public can be accessed from anywhere in the program.
- Protected: Protected entities can be accessed within the same class or by derived classes (classes that inherit from the current class).
- Private: Private entities can only be accessed within the same class.
- Package-private (or default in Java): These entities can be accessed within the same package (folder structure) as the class. This is the default access level if no modifier is specified.
Access scope is an important concept in OOP because it allows developers to control the visibility and modifiability of class members, which helps in information hiding and enforcing the encapsulation principle. Encapsulation is the idea of bundling data and operations together in a single class, and restricting access to those operations as necessary to ensure the integrity and safety of the data.