<s>
In	O
class-based	O
object-oriented	B-Language
programming	I-Language
languages	I-Language
,	O
a	O
leaf	B-Application
class	I-Application
is	O
a	O
class	O
that	O
should	O
not	O
be	O
subclassed	O
.	O
</s>
<s>
This	O
can	O
be	O
enforced	O
either	O
by	O
convention	O
,	O
or	O
by	O
using	O
a	O
language	O
feature	O
such	O
as	O
the	O
final	O
keyword	O
in	O
C++	B-Language
or	O
Java	B-Language
,	O
or	O
the	O
sealed	O
keyword	O
in	O
C#	B-Application
.	O
</s>
<s>
In	O
Java	B-Language
,	O
the	O
Leaf	O
node	O
is	O
an	O
abstract	O
class	O
for	O
all	O
scene	O
graph	O
nodes	O
that	O
have	O
no	O
children	O
.	O
</s>
