Java package Features and rules for use

Features of a Java package

• The protected members of the classes can be accessed by each other in the same package.
• It resolves the naming collision for the types it contains.
• A package may have the following types.
• Interfaces
• Classes
• Enumerated types
• Annotations

Naming convention (Rules) for using  the packages

• Package names are written in all lowercase to avoid conflict with the names of classes or interfaces.
• The directory name must be same as the name of package that is created using "package" keyword in the source file.
• Before running a program, the class path must be picked up till the main directory (or package) that is used in the program.
• If we are not including any package in our java source file then the source file automatically goes to the default package.
• In general, we start a package name begins with the order from top to bottom level.
• In case of the internet domain, the name of the domain is treated in reverse (prefix) order.