<s>
A	O
Java	B-Language
package	I-Language
organizes	O
Java	B-Language
classes	O
into	O
namespaces	O
,	O
</s>
<s>
In	O
general	O
,	O
a	O
package	O
can	O
contain	O
the	O
following	O
kinds	O
of	O
types	O
:	O
classes	O
,	O
interfaces	B-Language
,	O
enumerations	O
,	O
and	O
annotation	B-Language
types	O
.	O
</s>
<s>
A	O
package	O
allows	O
a	O
developer	O
to	O
group	O
classes	O
(	O
and	O
interfaces	B-Language
)	O
together	O
.	O
</s>
<s>
In	O
a	O
Java	B-Language
source	O
file	O
,	O
the	O
package	O
that	O
this	O
file	O
's	O
class	O
or	O
classes	O
belong	O
to	O
is	O
specified	O
with	O
the	O
package	O
keyword	O
.	O
</s>
<s>
To	O
use	O
a	O
package	O
's	O
classes	O
inside	O
a	O
Java	B-Language
source	O
file	O
,	O
it	O
is	O
convenient	O
to	O
import	O
the	O
classes	O
from	O
the	O
package	O
with	O
an	O
import	O
declaration	O
.	O
</s>
<s>
Documentation	O
explaining	O
the	O
package	O
as	O
a	O
whole	O
is	O
written	O
as	O
Javadoc	B-Language
in	O
a	O
file	O
named	O
exactly	O
`	O
package-info.java	O
`	O
.	O
</s>
<s>
The	O
official	O
Java	B-Language
Tutorial	O
advises	O
against	O
this	O
:	O
</s>
<s>
Otherwise	O
,	O
classes	O
and	O
interfaces	B-Language
belong	O
in	O
named	O
packages	O
.	O
</s>
<s>
The	O
Java	B-Language
Language	I-Language
Specification	I-Language
establishes	O
package	O
naming	O
conventions	O
to	O
avoid	O
the	O
possibility	O
of	O
two	O
published	O
packages	O
having	O
the	O
same	O
name	O
.	O
</s>
<s>
Complete	O
conventions	O
for	O
disambiguating	O
package	O
names	O
and	O
rules	O
for	O
naming	O
packages	O
when	O
the	O
Internet	O
domain	O
name	O
cannot	O
be	O
directly	O
used	O
as	O
a	O
package	O
name	O
are	O
described	O
in	O
section	O
7.7	O
of	O
the	O
Java	B-Language
Language	I-Language
Specification	I-Language
.	O
</s>
<s>
java.lang	O
basic	O
language	O
functionality	O
and	O
fundamental	O
types	O
that	O
is	O
available	O
without	O
the	O
use	O
of	O
an	O
import	O
statement	O
.	O
</s>
<s>
java.util	O
collection	O
data	B-General_Concept
structure	I-General_Concept
classes	O
java.io	O
file	O
operations	O
java.math	O
multiprecision	O
arithmetics	O
java.nio	B-Language
the	O
Non-blocking	B-Language
I/O	I-Language
framework	O
for	O
Java	B-Language
java.net	O
networking	O
operations	O
,	O
sockets	O
,	O
DNS	B-Protocol
lookups	I-Protocol
,	O
...	O
java.security	O
key	O
generation	O
,	O
encryption	O
and	O
decryption	O
java.sql	O
Java	B-Language
Database	I-Language
Connectivity	I-Language
(	O
JDBC	B-Language
)	O
to	O
access	O
databases	O
java.awt	O
basic	O
hierarchy	O
of	O
packages	O
for	O
native	O
GUI	O
components	O
java.text	O
Provides	O
classes	O
and	O
interfaces	B-Language
for	O
handling	O
text	O
,	O
dates	O
,	O
numbers	O
,	O
and	O
messages	O
in	O
a	O
manner	O
independent	O
of	O
natural	O
languages	O
.	O
</s>
<s>
java.rmi	O
Provides	O
the	O
RMI	O
package	O
.	O
</s>
<s>
java.time	O
The	O
main	O
API	O
for	O
dates	O
,	O
times	O
,	O
instants	O
,	O
and	O
durations	O
.	O
</s>
<s>
java.beans	O
The	O
java.beans	O
package	O
contains	O
classes	O
and	O
interfaces	B-Language
related	O
to	O
JavaBeans	O
components	O
.	O
</s>
<s>
java.applet	O
This	O
package	O
provides	O
classes	O
and	O
methods	O
to	O
create	O
and	O
communicate	O
with	O
the	O
applets	O
.	O
</s>
<s>
In	O
Java	B-Language
9	O
(	O
released	O
on	O
September	O
21	O
,	O
2017	O
)	O
support	O
for	O
"	O
modules	O
"	O
,	O
a	O
kind	O
of	O
collection	O
of	O
packages	O
,	O
was	O
implemented	O
as	O
a	O
result	O
of	O
the	O
development	O
effort	O
of	O
Project	O
Jigsaw	O
.	O
</s>
<s>
The	O
"	O
modules	O
"	O
were	O
earlier	O
called	O
"	O
superpackages	O
"	O
and	O
originally	O
planned	O
for	O
Java	B-Language
7	O
.	O
</s>
<s>
Modules	O
describe	O
their	O
dependencies	O
in	O
a	O
declaration	O
placed	O
in	O
a	O
file	O
named	O
module-info.java	O
at	O
the	O
root	O
of	O
the	O
module	O
's	O
source-file	O
hierarchy	O
.	O
</s>
<s>
Since	O
Java	B-Language
9	O
,	O
the	O
JDK	O
is	O
able	O
to	O
check	O
the	O
module	O
dependencies	O
both	O
at	O
compile	O
time	O
and	O
runtime	O
.	O
</s>
<s>
The	O
JDK	O
itself	O
is	O
modularized	O
for	O
Java	B-Language
9	O
.	O
</s>
