<s>
JFace	B-Language
is	O
defined	O
by	O
the	O
Eclipse	B-Application
project	O
as	O
"	O
a	O
UI	B-Library
toolkit	I-Library
that	O
provides	O
helper	O
classes	O
for	O
developing	O
UI	B-Application
features	O
that	O
can	O
be	O
tedious	O
to	O
implement.	O
"	O
</s>
<s>
The	O
Standard	B-Application
Widget	I-Application
Toolkit	I-Application
(	O
SWT	B-Application
)	O
is	O
an	O
open	O
source	O
widget	B-Library
toolkit	I-Library
for	O
Java	B-Device
designed	O
to	O
provide	O
efficient	O
,	O
portable	O
access	O
to	O
the	O
user-interface	B-Application
facilities	O
of	O
the	O
operating	O
systems	O
on	O
which	O
it	O
is	O
implemented	O
.	O
</s>
<s>
It	O
is	O
a	O
layer	O
that	O
sits	O
on	O
top	O
of	O
the	O
raw	O
widget	O
system	O
,	O
and	O
provides	O
classes	O
for	O
handling	O
common	O
UI	B-Application
programming	I-Application
tasks	O
.	O
</s>
<s>
It	O
brings	O
model	O
view	O
controller	O
programming	O
to	O
the	O
Standard	B-Application
Widget	I-Application
Toolkit	I-Application
.	O
</s>
<s>
Its	O
primary	O
goal	O
is	O
to	O
free	O
the	O
developer	O
up	O
,	O
letting	O
the	O
developer	O
focus	O
on	O
the	O
implementation	O
of	O
his	O
or	O
her	O
specific	O
application	O
without	O
having	O
to	O
be	O
concerned	O
with	O
the	O
underlying	O
widget	O
system	O
or	O
solving	O
problems	O
that	O
are	O
common	O
in	O
almost	O
all	O
UI	B-Application
applications	O
.	O
</s>
<s>
A	O
primary	O
concern	O
of	O
the	O
Eclipse	B-Application
group	O
when	O
developing	O
JFace	B-Language
was	O
that	O
under	O
no	O
circumstances	O
did	O
they	O
want	O
to	O
hide	O
the	O
SWT	B-Application
component	O
implementation	O
from	O
the	O
programmer	O
.	O
</s>
<s>
JFace	B-Language
is	O
completely	O
dependent	O
on	O
SWT	B-Application
,	O
but	O
SWT	B-Application
is	O
not	O
dependent	O
on	O
JFace	B-Language
.	O
</s>
<s>
Furthermore	O
,	O
the	O
Eclipse	B-Application
Workbench	O
is	O
built	O
on	O
both	O
JFace	B-Language
and	O
SWT	B-Application
;	O
in	O
some	O
instances	O
,	O
it	O
bypasses	O
JFace	B-Language
and	O
accesses	O
SWT	B-Application
directly	O
.	O
</s>
<s>
The	O
following	O
is	O
a	O
basic	O
Hello	O
World	O
program	O
using	O
JFace	B-Language
.	O
</s>
