Java Reference
In-Depth Information
15.9.1. Determining the Class being Instantiated
If the class instance creation expression ends in a class body, then the class being instantiated
is an anonymous class. Then:
• If the class instance creation expression is an unqualified class instance creation ex-
pression, then
TypeDeclSpecifier TypeArgumentsOrDiamond
opt
must denote a type,
or if
T
is an enum type (§
8.9
).
If
T
denotes a class, then an anonymous direct subclass of the class named by
T
is
declared. It is a compile-time error if the class denoted by
T
is a
final
class.
If
T
denotes an interface, then an anonymous direct subclass of
Object
that imple-
ments the interface named by
T
is declared.
In either case, the body of the subclass is the
ClassBody
given in the class instance
creation expression.
The class being instantiated is the anonymous subclass.
• Otherwise, the class instance creation expression is a qualified class instance cre-
ation expression.
It is a compile-time error if the
Identifier
after the
new
token is not the simple name
compile-time type of the
Primary
.
It is a compile-time error if the name is ambiguous (§
8.5
) or denotes an enum type.
When
TypeArguments
are provided after the name, it is a compile-time error if the
type arguments, when applied to the named class, do not denote a well-formed para-
Let
T
be the type named by the
Identifier
and any type arguments. An anonymous
direct subclass of the class named by
T
is declared. The body of the subclass is the
ClassBody
given in the class instance creation expression.
The class being instantiated is the anonymous subclass.
If a class instance creation expression does not declare an anonymous class, then:
• If the class instance creation expression is an unqualified class instance creation ex-
pression, then the
TypeDeclSpecifier
must denote a class that is accessible (§
6.6
)
and is not an enum type and not
abstract
, or a compile-time error occurs.
