Access Restrictions.
Signed-off-by: Michael <Michael@Mchael.zeng.com>
inheritances and polymorphism.
Signed-off-by: Michael <Michael@Mchael.zeng.com>
Access restrictions.
Signed-off-by: Michael <Michael@Mchael.zeng.com>
Property.
Signed-off-by: Michael <Michael@Mchael.zeng.com>
Single inheritance.
Signed-off-by: Michael <Michael@Mchael.zeng.com>