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Example: protected Fields, Methods, and Constructors
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it terminates normally If move of Point were overridden by move in PlusPoint, then this program would recurse in nitely, until a StackoverflowError occurred 666 Example: public Fields, Methods, and Constructors A public class member or constructor is accessible throughout the package where it is declared and from any other package, provided the package in which it is declared is observable ( 743) For example, in the compilation unit:
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package points; public class Point { int x, y; public void move(int dx, int dy) { x += dx; y += dy; moves++; }
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667 Example: protected Fields, Methods, and Constructors Consider this example, where the points package declares:
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package points; public class Point { protected int x, y; void warp(threePointPoint3d a) { if (az > 0) // compile-time error: cannot access az adelta(this); } } and the threePoint package declares: package threePoint; import pointsPoint; public class Point3d extends Point { protected int z; public void delta(Point p) { px += thisx; // compile-time error: cannot access px
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public static int moves = 0; } the public class Point has as public members the move method and the moves eld These public members are accessible to any other package that has access to package points The elds x and y are not public and therefore are accessible only from within the package points
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py += thisy;
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// compile-time error: cannot access py
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public qx qy qz } } void delta3d(Point3d q) { += thisx; += thisy; += thisz;
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668 Example: private Fields, Methods, and Constructors
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A private class member or constructor is accessible only within the body of the
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top level class ( 76) that encloses the declaration of the member or constructor It is not inherited by subclasses In the example:
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class Point { Point() { setMasterID(); } int x, y; private int ID; private static int masterID = 0; private void setMasterID() { ID = masterID++; } } the private members ID, masterID, and setMasterID may be used only within the body of class Point They may not be accessed by quali ed names,
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eld access expressions, or method invocation expressions outside the body of the declaration of Point See 888 for an example that uses a private constructor
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which de nes a class Point3d A compile-time error occurs in the method delta here: it cannot access the protected members x and y of its parameter p, because while Point3d (the class in which the references to elds x and y occur) is a subclass of Point (the class in which x and y are declared), it is not involved in the implementation of a Point (the type of the parameter p) The method delta3d can access the protected members of its parameter q, because the class Point3d is a subclass of Point and is involved in the implementation of a Point3d The method delta could try to cast ( 55, 1516) its parameter to be a Point3d, but this cast would fail, causing an exception, if the class of p at run time were not Point3d A compile-time error also occurs in the method warp: it cannot access the protected member z of its parameter a, because while the class Point (the class in which the reference to eld z occurs) is involved in the implementation of a Point3d (the type of the parameter a), it is not a subclass of Point3d (the class in which z is declared)
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Fully Quali ed Names and Canonical Names
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67 Fully Quali ed Names and Canonical Names
Every package, top level class, top level interface, and primitive type has a fully quali ed name An array type has a fully quali ed name if and only if its element type has a fully quali ed name The fully quali ed name of a primitive type is the keyword for that primitive type, namely boolean, char, byte, short, int, long, float, or double
The fully quali ed name of a named package that is a subpackage of another named package consists of the fully quali ed name of the containing package, followed by , followed by the simple (member) name of the subpackage The fully quali ed name of a top level class or top level interface that is declared in an unnamed package is the simple name of the class or interface
A member class or member interface M of another class C has a fully quali ed name if and only if C has a fully quali ed name In that case, the fully quali ed name of M consists of the fully quali ed name of C, followed by , followed by the simple name of M The fully quali ed name of an array type consists of the fully quali ed name of the component type of the array type followed by [] Examples: The fully quali ed name of the type long is long
In the example:
The fully quali ed name of the package javalang is javalang because it is subpackage lang of package java
The fully quali ed name of the class Object, which is de ned in the package javalang, is javalangObject The fully quali ed name of the interface Enumeration, which is de ned in the package javautil, is javautilEnumeration The fully quali ed name of the type array of array of array of array of String is javalangString[][][][]
The fully quali ed name of the type array of double is double[]
The fully quali ed name of a top level class or top level interface that is declared in a named package consists of the fully quali ed name of the package, followed by , followed by the simple name of the class or interface
The fully quali ed name of a named package that is not a subpackage of a named package is its simple name