JavaFX Script Classes in Java

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11 JavaFX Script Classes
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public override bound function contains(point:Point2D):Boolean return pointx >= x and pointx < x + width and pointy >= y and pointy < y + height; } public bound function contains(rect:ExampleRectangle):Boolean var topLeft = Point2D { x: rectx y: recty }; var bottomRight = Point2D { x: rectx + rectwidth - 1 y: recty + rectheight - 1 }; return contains(topLeft) and contains(bottomRight); } public override function toString():String { "Rectangle at ({x}, {y}), width: {width}, height: ", {supertoString()}" } public override function clone():ExampleRectangle { return ExampleRectangle { x: x y: y width: width height: height }; } }
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A subclass is declared by including an extends clause in the class statement In this case, the ExampleRectangle class extends the JavaFX class ExampleShape:
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public class ExampleRectangle extends ExampleShape {
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The extends clause may contain any or all the following:
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The name of one Java class or of one JavaFX class or of one Java-derived JavaFX class The names of any number of Java interfaces The names of any number of mixin classes
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A Java-derived JavaFX class is one that either directly extends a Java class (other than
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javalangObject) or a class that is derived from such a class For example, if a JavaFX class called JavaFXDate extends the Java class javautilDate, JavaFXDate is a Javaderived class If you define another class called (say) MyJavaFXDate that extends JavaFXDate, MyJavaFXDate would also be a Java-derived class
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A mixin is a special type of class that is explicitly designed to be incorporated into other classesYou would use a mixin to package reusable functionality and then add it to
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another class by including it in the extends list of that class Mixins are discussed at the end of this chapter Although no special declaration is required to extend a Java class, one requirement must be met:The Java class must have a no-argument constructor that is accessible to the subclassThat is, it must be public or protected, or be package private, and the Java class must in the same package as the JavaFX classThis is required because JavaFX classes do not have a constructor and therefore cannot provide arguments to the constructor of the Java class A JavaFX class with no extends clause or with an extends clause that does not contain a Java-derived class is implicitly derived from javalangObject It follows, therefore, that all JavaFX classes inherit the behavior and methods of javalangObject Note that unlike Java, JavaFX does not have the keyword implements to indicate the implementation of an interface in JavaFX, the names of implemented interfaces are listed in the extends clause:
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// This class implements the javalangComparable interface class MyJavaFXClass extends MyOtherClass, Comparable { }
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A subclass inherits all the behavior and the visible instance variables and functions of its base classWhether a variable or function is visible to the subclass depends on the modifiers used in its declaration and where the subclass is defined:
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All public and protected functions and variables are available to the subclass All script-private functions and variables are available if the subclass is declared in the same script as the base class All package functions and variables are available if the subclass is in the same package as the base class
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Subclasses may add state in the form of new instance variables or new functionsThe class shown in Listing 11-3 adds the state necessary to define a rectangle (the instance variables x, y, width, and height) together with an overload of the contains() functionA subclass may also override functions and variables declared in the base class
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