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CHAPTER 7 Classes
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6 If CLASSPATH already exists, highlight CLASSPATH and select Edit Then place the path to the package at the end of the CLASSPATH 7 Click OK
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Packages and Access Protection
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Previously in this chapter, you learned how access specifiers are used to control access to members of a class Packages provide a mechanism for controlling access, too A class is a container that encapsulates members of the class A package is also a container that encapsulates classes and subordinates packages Packages provide four kinds of access control to classes contained in a package:
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Control of subclasses in the same package Control of no subclasses in the same package Control of subclasses in a different package Control of classes that are not in the same package or not a subclass
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The following table shows the effect access specifiers have on packages
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Same Package No Modifier Public Protected Private Yes Yes Yes Yes Same Package, Subclass Yes Yes Yes No Same Package, No Subclass Yes Yes Yes No Different Package, Subclass No Yes Yes No Different Package, No Subclass No Yes No No
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Quiz
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1 What is an instance variable 2 What is the difference between an instance and an object 3 What is a class 4 What is a constructor 5 What is the difference between a destructor and the finalize() method member of a class 6 What does overloading a method member mean
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7 How do you declare an instance of a class 8 What is the purpose of an access specifier 9 Can a constructor have an argument list
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Java Demystified
10 What is a common reason for overloading a constructor
CHAPTER
Inheritance
Some say that inheriting wealth is the best thing that can happen to you, because you don t have to scrimp and save to get what you want Instead, someone else has done that for you, letting you focus on spending the money Inheritance has a similar effect when you re writing a Java program Although you ll still need to count your pennies, you can utilize someone else s classes Instead of writing all the classes for yourself, you can focus on creating only classes that no one else has written You ll learn how to inherit classes in this chapter
What Is Inheritance
In the previous chapter, you learned that a class definition defines attributes and behaviors of a real-world object Attributes are represented as instance variables, and behaviors are represented as method members of a class Some objects have some things in common yet other things that are unique to each kind of object For example, a graduate student and an undergraduate student are both students That is, they have the same attributes and behaviors of all students Yet a graduate student also has attributes and behaviors that are different from other
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Java Demystified
kinds of students, such as paying tuition based on the graduate per-credit rate An undergraduate student pays tuition at the undergraduate per-credit rate Programmers tend to declare instance variables and define method members that are common to multiple objects in one class definition Then, classes that define related objects can inherit that class In the case of a student, a programmer would define a student class that defines all the attributes and behaviors common to all students A programmer would also define a graduate student class and an undergraduate student class Both of these classes would inherit the common attributes and behaviors of a student from the student class From a practical viewpoint, a programmer would have to replicate attributes and behaviors common to all students in both the graduate student class and the undergraduate student class if the student classes were not inherited This amounts to redundant code, which is something to avoid because it unnecessarily makes your program complex and requires you to maintain the same code in more than one place in the program
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