Package in java ~ Online tutorial

Package

PROGRAMS are organized as sets of packages. Each has its own set of
names for types, which helps to prevent name conflicts.
A top level type is accessible outside thepackagethat declares
it only if the type is declared public.
The naming structure for packages is hierarchical . The members of a
package are class and interface types , which are declared in compilation
units of the package, and subpackages, which may contain compilation units and
subpackages of their own.
A package can be stored in a file system or in a database .
Packages that are stored in a file system may have certain constraints on the organization of their compilation units to allow a simple implementation to find
classes easily.
A package consists of a number of compilation units .
A compilation
unit automatically has access to all types declared in its package and also automatically imports all of the public types declared in the
predefined package
java.lang.
For small programs and casual development, a package can be unnamed
or have a simple name, but if code is to be widely distributed, unique
package names should be chosen .
This can prevent the conflicts that would
otherwise occur if two development groups happened to pick the same package
name and these packages were later to be used in a single program.

Please Give Us Your 1 Minute In Sharing This Post!

SOCIALIZE IT →

Online tutorial