ConstructorModi er: one of Annotation public protected private in Java

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The access modi ers public, protected, and private are discussed in 66 A compile-time error occurs if the same modi er appears more than once in a constructor declaration, or if a constructor declaration has more than one of the access modi ers public, protected, and private If no access modi er is speci ed for the constructor of a normal class, the constructor has default access If no access modi er is speci ed for the constructor of an enum type, the constructor is private It is a compile-time error if the constructor of an enum type ( 89) is declared public or protected If an annotation a on a constructor corresponds to an annotation type T, and T has a (meta-)annotation m that corresponds to annotationTarget, then m must have an element whose value is annotationElementTypeCONSTRUCTOR, or a compile-time error occurs Annotations are further discussed in 97 Unlike methods, a constructor cannot be abstract, static, final, native, strictfp, or synchronized A constructor is not inherited, so there is no need to declare it final and an abstract constructor could never be implemented A constructor is always invoked with respect to an object, so it makes no sense for a constructor to be static There is no practical need for a constructor to be synchronized, because it would lock the object under construction, which is normally not made available to other threads until all constructors for the object have completed their work The lack of native constructors is an arbitrary language design choice that makes it easy for an implementation of the Java virtual machine to verify that superclass constructors are always properly invoked during object creation Note that a ConstructorModi er cannot be declared strictfp This difference in the de nitions for ConstructorModi er and MethodModi er ( 843) is an intentional language design choice; it effectively ensures that a constructor is FPstrict ( 154) if and only if its class is FP-strict
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884 Generic Constructors It is possible for a constructor to be declared generic, independently of whether the class the constructor is declared in is itself generic A constructor is generic if it declares one or more type variables ( 44) These type variables are known as the formal type parameters of the constructor The form of the formal type parameter list is identical to a type parameter list of a generic class or interface, as described in 812 The scope of a constructor s type parameter is the entire declaration of the constructor, including the type parameter section itself Therefore, type parameters can appear as parts of their own bounds, or as bounds of other type parameters declared in the same section Type parameters of generic constructor need not be provided explicitly when a generic constructor is invoked When they are not provided, they are inferred as speci ed in 151227
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885 Constructor Throws
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The throws clause for a constructor is identical in structure and behavior to the throws clause for a method ( 846) 886 The Type of a Constructor
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The type of a constructor consists of its signature and the exception types given its throws clause 887 Constructor Body
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The rst statement of a constructor body may be an explicit invocation of another constructor of the same class or of the direct superclass ( 8871) ConstructorBody: { ExplicitConstructorInvocationopt BlockStatementsopt }
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It is a compile-time error for a constructor to directly or indirectly invoke itself through a series of one or more explicit constructor invocations involving this If the constructor is a constructor for an enum type ( 89), it is a compiletime error for it to invoke the superclass constructor explicitly If a constructor body does not begin with an explicit constructor invocation and the constructor being declared is not part of the primordial class Object, then the constructor body is implicitly assumed by the compiler to begin with a super-
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