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Introduction to Java Programming Chapter9 Abstract Classes and Interfaces * * * Objectives To design and use abstract classes (§10.2). To process a calendar using the Calendar and GregorianCalendar classes (§10.3). To declare interfaces to model weak inheritance relationships (§10.4). To define a natural order using the Comparable interface (§10.4.1). To know the similarities and differences between an abstract class and an interface (§10.4.2). To declare custom interfaces (§10.4.3). (Optional) To enable objects cloneable using the Cloneable interface (§10.4.4). To use wrapper classes (Byte, Short, Integer, Long, Float, Double, Character, and Boolean) to wrap primitive data values into objects (§10.5). (Optional) To use the BigInteger and BigDecimal classes for computing very large numbers with arbitrary precisions (§10.5.6). To create a generic sort method (§10.5). To simplify programming using JDK 1.5 automatic conversion between primitive types and wrapper class types (§10.6). (Optional GUI) To handle GUI events (§10.7). * The abstract Modifier The abstract class Cannot be instantiated Should be extended and implemented in subclasses The abstract method Method signature without implementation * From Chapter 9 * Abstract Classes GeometricObject Circle Rectangle * NOTE An abstract method cannot be contained in a nonabstract class. If a subclass of an abstract superclass does not implement all the abstract methods, the subclass must be declared abstract. In other words, in a nonabstract subclass extended from an abstract class, all the abstract methods must be implemented, even if they are not used in the subclass. * NOTE An abstract class cannot be instantiated using the new operator, but you can still define its constructors, which are invoked in the constructors of its subclasses. For instance, the constructors of GeometricObject are invoked in the Circle class and the Rectangle class. * NOTE A class that contains abstract methods must be abstract. However,
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