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Advanced Examples of Classes with Inheritance and Encapsulation
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public interface Fax { public void sendFax(File f,int number); public Object getReceivedFaxes(); }
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This interface is for a fax machine. This simple fax machine can send a file with the sendFax(File f,int number) method, or return a fax as an Object with the getReceivedFaxes() method. The following is the PrinterFaxCombo class. This class implements both interfaces.
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public class PrinterFaxCombo implements Fax, Printer{ private Object incomingFax; private int inkLevel; public void sendFax(File f, int number) { dialNumber(number); faxFile(f); } public Object getReceivedFaxes() { return incomingFax; } public void printFile(File f) { sendFileToPrinter(f); } public int getInkLevel() { return inkLevel; } private boolean dialNumber(int number){ boolean success = true; /* Dial number set success to false if it is not successful */ return success; } private void faxFile(File f){ /* Send the File f as a fax */ } private void sendFileToPrinter(File f){ /* Print the File f */ }
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/* * This class would contain many more methods to * implement all of this functionality. */ }
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The preceding PrinterFaxCombo class is a simplistic version of a printer that can also fax. The class is not fully implemented, but the comments in the empty methods should explain the purpose of each method. The important point of this example is that this class implements both the Printer and Fax interfaces. By implementing the interfaces, the PrinterFaxCombo class is obligated to implement each method they contain. The advantage of implementing interfaces is that it allows an external object to know that this class provides the functionality of a printer and fax machine. Every class that implements the Printer interface provides printing functionality and has the same public interface. This creates modular code and allows easy swapping in and out of different classes based on the needs of the application. Interfaces also allow for polymorphism. This will be discussed in detail in 8.
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This chapter has been about class inheritance and encapsulation. Inheritance is an important concept in Java. It is the term used to describe one class gaining the methods and instance variables of a parent class. This concept allows a developer to find commonality between classes and create a general parent class that each specific class can extend, or inherit, to then gain common functionality. This promotes code reuse. Concrete classes and abstract classes are both able to be extended to create subclasses. The class that is extended is then considered the superclass, or base class. A class may only extend one class. Concrete classes are a traditional class with each method implemented. A class that extends a concrete class gains all of its visible methods. Abstract classes must be extended and cannot be instantiated in code. They contain a mixture of implemented and abstract, or unimplemented, methods. When an abstract class is extended, all of its abstract methods must be implemented by the subclass. Interfaces are a set of unimplemented methods. When a class implements an interface, that class must then implement each method that is in the interface. Interfaces are used to define a predetermined set of exposed methods. Classes may
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implement as many interfaces as they need as long as all methods are then implemented in that class. Next, Java access modifiers were discussed. The public and private access modifiers are used to prefix a method or instance variable. The public access modifier allows any code to access that method or instance variable. The private access modifier only allows code within its own class to access the method or instance variable. Another major concept covered in this chapter was encapsulation. Encapsulation is the design concept of allowing access to a class only through a public interface while hiding the rest of the implementation details. A public interface is created by the methods that have the public access modifier. Implementation details should be hidden by using the private access modifier. The code that uses this class can only access data through public methods and never accesses data directly since private is used. Getters and setters are normally used to access the hidden data. A getter is a simple method that returns an instance variable, while a setter is a method that sets an instance variable to the value passed to it as an argument. This chapter concluded with code examples. These examples are important to understand since the SCJA exam will have questions based on a given code segment.
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