What is the use of eclipse package building?

Building a package in eclipse can bind a series of source files (classes) to a library. At the same time, the package also facilitates namespace management to avoid conflicts between classes with the same name.

Function of package

1 Organize classes or interfaces with similar or related functions into the same package to facilitate the classification of classes Find and use.

2 Like folders, packages are also stored in a tree directory. The names of classes in the same package are different, and the names of classes in different packages can be the same. When classes with the same class name in two different packages are called at the same time, the package name should be added to distinguish them. Therefore, packages can avoid name conflicts.

3 Packages also limit access permissions. Only classes with package access permissions can access classes in a certain package.

Java uses the package mechanism to prevent naming conflicts, access control, and provide search and location classes, interfaces, enumerations, annotations, etc.

Principles:

(1) The package statement must be placed at the beginning of the source file

(2) A source file can only have one package statement

(3) All package names are in lowercase letters to avoid conflicts with class and interface names.

Usage:

(1) Use the full name to access the class

(2) import the class

(3) import The entire package containing this class

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