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public class OnePoint { public static pointsPoint getOne() { return new Point3d(); } }
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package morePoints;
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public class Point4d extends Point3d { public int w; public void move(int dx, int dy, int dz, int dw) { supermove(dx, dy, dz); w += dw; } }
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then class Point4d would inherit the eld z, which, being public, could then be accessed by code in packages other than morePoints, through variables and expressions of the public type Point4d
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An invocation morePointsOnePointgetOne() in yet a third package would return a Point3d that can be used as a Point, even though the type Point3d is not available outside the package morePoints The two argument version of method move could then be invoked for that object, which is permissible because method move of Point3d is public (as it must be, for any method that overrides a public method must itself be public, precisely so that situations such as this will work out correctly) The elds x and y of that object could also be accessed from such a third package While the eld z of class Point3d is public, it is not possible to access this eld from code outside the package morePoints, given only a reference to an instance of class Point3d in a variable p of type Point This is because the expression pz is not correct, as p has type Point and class Point has no eld named z; also, the expression ((Point3d)p)z is not correct, because the class type Point3d cannot be referred to outside package morePoints The declaration of the eld z as public is not useless, however If there were to be, in package morePoints, a public subclass Point4d of the class Point3d:
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Field Declarations
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83 Field Declarations
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Poetic elds encompass me around, And still I seem to tread on classic ground
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The variables of a class type are introduced by eld declarations:
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VariableDeclarators: VariableDeclarator VariableDeclarators , VariableDeclarator
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VariableDeclarator: VariableDeclaratorId VariableDeclaratorId = VariableInitializer VariableDeclaratorId: Identi er VariableDeclaratorId [ ] VariableInitializer: Expression ArrayInitializer
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The FieldModi ers are described in 831 The Identi er in a FieldDeclarator may be used in a name to refer to the eld Fields are members; the scope ( 63) of a eld declaration is speci ed in 816 More than one eld may be declared in a single eld declaration by using more than one declarator; the FieldModi ers and Type apply to all the declarators in the declaration Variable declarations involving array types are discussed in 102 It is a compile-time error for the body of a class declaration to declare two elds with the same name Methods, types, and elds may have the same name, since they are used in different contexts and are disambiguated by different lookup procedures ( 65) If the class declares a eld with a certain name, then the declaration of that eld is said to hide any and all accessible declarations of elds with the same name in superclasses, and superinterfaces of the class The eld declaration also shadows ( 631) declarations of any accessible elds in enclosing classes or interfaces, and any local variables, formal method parameters, and exception handler parameters with the same name in any enclosing blocks
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FieldDeclaration: FieldModi ersopt Type VariableDeclarators ;
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Field Modi ers
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FieldModi ers: FieldModi er FieldModi ers FieldModi er
FieldModi er: one of Annotation public protected private
final transient volatile
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 eld declaration, or if a eld declaration has more than one of the access modi ers public, protected, and private If an annotation a on a eld declaration corresponds to an annotation type T, and T has a (meta-)annotation m that corresponds to annotationTarget, then m
If a eld declaration hides the declaration of another eld, the two elds need not have the same type A class inherits from its direct superclass and direct superinterfaces all the non-private elds of the superclass and superinterfaces that are both accessible to code in the class and not hidden by a declaration in the class Note that a private eld of a superclass might be accessible to a subclass (for example, if both classes are members of the same class) Nevertheless, a private eld is never inherited by a subclass It is possible for a class to inherit more than one eld with the same name ( 8333) Such a situation does not in itself cause a compile-time error However, any attempt within the body of the class to refer to any such eld by its simple name will result in a compile-time error, because such a reference is ambiguous There might be several paths by which the same eld declaration might be inherited from an interface In such a situation, the eld is considered to be inherited only once, and it may be referred to by its simple name without ambiguity A hidden eld can be accessed by using a quali ed name (if it is static) or by using a eld access expression ( 1511) that contains the keyword super or a cast to a superclass type See 15112 for discussion and an example A value stored in a eld of type float is always an element of the oat value set ( 423); similarly, a value stored in a eld of type double is always an element of the double value set It is not permitted for a eld of type float to contain an element of the oat-extended-exponent value set that is not also an element of the oat value set, nor for a eld of type double to contain an element of the double-extended-exponent value set that is not also an element of the double value set