<s>
Pack200	B-Language
,	O
specified	O
in	O
JSR	B-Language
200	O
(	O
J2SE	O
1.5	O
)	O
,	O
deprecated	O
in	O
JEP	B-Language
336	O
(	O
Java	B-Device
SE	O
11	O
)	O
and	O
removed	O
in	O
JEP	B-Language
367	O
(	O
Java	B-Device
SE	O
14	O
)	O
,	O
is	O
a	O
compacting	B-General_Concept
archive	O
format	O
developed	O
by	O
Sun	O
,	O
capable	O
of	O
reducing	O
JAR	B-Language
file	I-Language
sizes	O
by	O
up	O
to	O
a	O
factor	O
of	O
9	O
,	O
with	O
a	O
factor	O
of	O
3	O
to	O
4	O
seen	O
in	O
practice	O
.	O
</s>
<s>
Pack200	B-Language
is	O
optimized	O
for	O
compressing	O
JAR	B-Language
archive	O
files	O
,	O
specifically	O
the	O
Java	B-Language
bytecode	I-Language
portion	O
of	O
the	O
JAR	B-Language
files	I-Language
.	O
</s>
<s>
Applications	O
of	O
this	O
technology	O
include	O
faster	O
Java	B-Device
application	O
deployment	O
over	O
Java	B-Application
Web	I-Application
Start	I-Application
.	O
</s>
<s>
After	O
Pack200	B-Language
,	O
gzip	B-Application
compression	I-Application
is	O
usually	O
applied	O
.	O
</s>
<s>
In	O
HTTP	O
compression	O
,	O
such	O
content	O
is	O
specified	O
by	O
the	O
Content-Encoding	O
type	O
pack200-gzip	O
.	O
</s>
<s>
Pack200	B-Language
may	O
also	O
refer	O
to	O
the	O
Pack200	B-Language
compression	O
tools	O
(	O
pack200	B-Language
and	O
unpack200	B-Language
)	O
provided	O
in	O
the	O
Java	B-Language
Development	I-Language
Kit	I-Language
from	O
Java	B-Device
5	O
until	O
Java	B-Device
14	O
.	O
</s>
<s>
Pack200	B-Language
modifies	O
the	O
contents	O
of	O
the	O
Java	B-Language
class	I-Language
files	I-Language
in	O
the	O
JAR	B-Language
archive	O
undergoing	O
compression	O
.	O
</s>
<s>
Transformations	O
to	O
the	O
class	B-Language
files	I-Language
include	O
merging	O
constant	O
pools	O
and	O
removing	O
duplicated	O
attributes	O
.	O
</s>
<s>
The	O
format	O
is	O
not	O
lossless	O
;	O
it	O
is	O
possible	O
for	O
a	O
JAR	B-Language
file	I-Language
after	O
unpacking	O
to	O
not	O
be	O
identical	O
to	O
how	O
it	O
was	O
before	O
packing	O
.	O
</s>
