Obscured Declarations in Java

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632 Obscured Declarations A simple name may occur in contexts where it may potentially be interpreted as the name of a variable, a type or a package In these situations, the rules of 65 specify that a variable will be chosen in preference to a type, and that a type will be chosen in preference to a package Thus, it is may sometimes be impossible to refer to a visible type or package declaration via its simple name We say that such a declaration is obscured Obscuring is distinct from shadowing ( 631) and hiding ( 83, 8482, 85, 93, 95) The naming conventions of 68 help reduce obscuring
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64 Members and Inheritance
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641 The Members of Type Variables, Parameterized Types, Raw Types and Intersection Types The members of a type variable were speci ed in 44, the members of a parameterized type in 452, those of a raw type in 48, and the members of an intersection type were speci ed in 49
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642 The Members of a Package
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The members of a package ( 7) are speci ed in 71 For convenience, we repeat that speci cation here: The members of a package are its subpackages and all the top level ( 76) class types ( 8) and top level interface types ( 9) declared in all the compilation units ( 73) of the package In general, the subpackages of a package are determined by the host system ( 72) However, the package java always includes the subpackages lang and io and may include other subpackages No two distinct members of the same package may have the same simple name ( 71), but members of different packages may have the same simple name
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Packages and reference types have members This section provides an overview of the members of packages and reference types here, as background for the discussion of quali ed names and the determination of the meaning of names For a complete description of membership, see 44, 452, 48, 49, 71, 82, 92, and 107
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For example, it is possible to declare a package:
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package vector; public class Vector { Object[] vec; } that has as a member a public class named Vector, even though the package javautil also declares a class named Vector These two class types are differ-
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The members of a class type ( 82) are classes ( 85, 95), interfaces ( 85, 95), elds ( 83, 93, 107), and methods ( 84, 94) Members are either declared in the type, or inherited because they are accessible members of a superclass or superinterface which are neither private nor hidden nor overridden ( 848) The members of a class type are all of the following: Members inherited from its direct superclass ( 814), if it has one (the class Object has no direct superclass) Members inherited from any direct superinterfaces ( 815) Members declared in the body of the class ( 816) Constructors ( 88) and type variables ( 44) are not members There is no restriction against a eld and a method of a class type having the same simple name Likewise, there is no restriction against a member class or member interface of a class type having the same simple name as a eld or method of that class type A class may have two or more elds with the same simple name if they are declared in different interfaces and inherited An attempt to refer to any of the elds by its simple name results in a compile-time error ( 6572, 82) In the example:
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interface Colors { int WHITE = 0, BLACK = 1; } interface Separates { int CYAN = 0, MAGENTA = 1, YELLOW = 2, BLACK = 3; }
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ent, re ected by the fact that they have different fully quali ed names ( 67) The fully quali ed name of this example Vector is vectorVector, whereas javautilVector is the fully quali ed name of the Vector class usually included in the Java platform Because the package vector contains a class named Vector, it cannot also have a subpackage named Vector
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