The class Point is a superclass of class ColoredPoint in Java

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The class Point is a superclass of class ColoredPoint
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There exists a class B such that A is a subclass of B , and B is a subclass of C , applying this de nition recursively
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Superinterfaces
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CLASSES
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causes a compile-time error If circularly declared classes are detected at run time, as classes are loaded ( 122), then a ClassCircularityError is thrown 815 Superinterfaces The optional implements clause in a class declaration lists the names of interfaces that are direct superinterfaces of the class being declared:
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implements InterfaceTypeList
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InterfaceTypeList: InterfaceType InterfaceTypeList , InterfaceType
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The following is repeated from 43 to make the presentation here clearer: InterfaceType: TypeDeclSpeci er TypeArgumentsopt
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C Object ,
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Given a (possibly generic) class declaration for C<F1,,Fn>, n 0 , the direct superinterfaces of the class type ( 45) C<F1,,Fn> are the types given in the implements clause of the declaration of C if an implements clause is present Let C<F1,,Fn>, n > 0 , be a generic class declaration The direct superinterfaces of the parameterized class type C<T1,,Tn> , where Ti, 1 i n , is a type, are all types I<U1 theta , , Uk theta>, where I<U1,,Uk> is a direct superinterface of C<F1,,Fn>, and theta is the substitution [F1 := T1, , Fn := Tn] Each InterfaceType must name an accessible ( 66) interface type, or a compile-time error occurs If the TypeName is followed by any type arguments, it must be a correct invocation of the type declaration denoted by TypeName, and none of the type arguments may be wildcard type arguments, or a compile-time error occurs A compile-time error occurs if the same interface is mentioned as a direct superinterface two or more times in a single implements clause names This is true even if the interface is named in different ways; for example, the code:
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class Redundant implements javalangCloneable, Cloneable { int x; }
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Interfaces:
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results in a compile-time error because the names javalangCloneable and Cloneable refer to the same interface An interface type I is a superinterface of class type C if any of the following is true: I is a direct superinterface of C C has some direct superinterface J for which I is a superinterface, using the de nition of superinterface of an interface given in 913
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A class is said to implement all its superinterfaces In the example:
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public interface Colorable { void setColor(int color); int getColor(); }
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public enum Finish {MATTE, GLOSSY}
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class Point { int x, y; }
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class ColoredPoint extends Point implements Colorable { int color; public void setColor(int color) { thiscolor = color; } public int getColor() { return color; } } class PaintedPoint extends ColoredPoint implements Paintable { Finish finish; public void setFinish(Finish finish) { thisfinish = finish; } public Finish getFinish() { return finish; } }
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the relationships are as follows: The interface Paintable is a superinterface of class PaintedPoint The interface Colorable is a superinterface of class ColoredPoint and of class PaintedPoint
public interface Paintable extends Colorable { void setFinish(Finish finish); Finish getFinish(); }
I is a superinterface of the direct superclass of C
Superinterfaces
CLASSES
The interface Paintable is a subinterface of the interface Colorable, and Colorable is a superinterface of Paintable, as de ned in 913 A class can have a superinterface in more than one way In this example, the class PaintedPoint has Colorable as a superinterface both because it is a superinterface of ColoredPoint and because it is a superinterface of Paintable Unless the class being declared is abstract, the declarations of all the method members of each direct superinterface must be implemented either by a declaration in this class or by an existing method declaration inherited from the direct superclass, because a class that is not abstract is not permitted to have abstract methods ( 8111) Thus, the example:
interface Colorable { void setColor(int color); int getColor(); } class Point { int x, y; };
causes a compile-time error, because ColoredPoint is not an abstract class but it fails to provide an implementation of methods setColor and getColor of the interface Colorable It is permitted for a single method declaration in a class to implement methods of more than one superinterface For example, in the code:
interface Fish { int getNumberOfScales(); } interface Piano { int getNumberOfScales(); } class Tuna implements Fish, Piano { // You can tune a piano, but can you tuna sh int getNumberOfScales() { return 91; } }
the method getNumberOfScales in class Tuna has a name, signature, and return type that matches the method declared in interface Fish and also matches the method declared in interface Piano; it is considered to implement both On the other hand, in a situation such as this:
interface Fish { int getNumberOfScales(); } interface StringBass { double getNumberOfScales(); } class Bass implements Fish, StringBass { // This declaration cannot be correct, no matter what type is used
class ColoredPoint extends Point implements Colorable { int color; }