Packages in Java

The role of the ① package:

Manage Java files;

Resolves file conflicts with the same name.

② Package Definition: Package name (package name with lowercase letters, not mixed case)

The package definition must be placed on the first line of the source program;

Can be used between package names. Separated.

You can define a sibling package, or you can define a child package.

Use of the ③ package:

Import the package using the Import keyword;

You can import all the file Eg:com.imooc in a package. *；

You can also import all the files under a child package.

　　

Packages in Java