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CHAPTER 7 Classes
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screen Instead, the display() method member declares an instance of the Inner class and calls the Inner class s print() member method, which directly displays the instance variable The Inner class can directly access the Outer class s instance variable
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class Demo { public static void main (String args [] ) { Outer outer = new Outer(); outerdisplay(); } } class Outer { int student = 1234; void display() { Inner inner = new Inner(); innerprint(); } class Inner { void print() { Systemoutprintln("Hello, student " + student); } } }
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Static Initializers
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Sometimes, programmers define a class whose sole purpose is to initialize variables that are used by other classes in the program Programmers call such a class a static initializer A static intitalizer class contains static variables that can be used within a program directly without declaring an instance of the class This is Java s way of effectively enabling a program to create a global variable, which is a variable that can be used throughout the program You reference a static variable by using the class name and the name of the static variable separated by a dot, as shown in the following example This example defines the DefaultValues class This class contains the static variable passingGrade, which is initialized within the class The passingGrade variable is then called within the main() method and displayed on the screen
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class DefaultValues { static int passingGrade = 70; }
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class demo { public static void main(String args[]) { Systemoutprintln( "The value of the passing grade is : " + DefaultValues passingGrade); } }
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Packages
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Programmers organize classes into groups, and each group is stored in a package The package provides naming and visibility control in addition to being an efficient way to manage classes Programmers reference a package at the top of their source code whenever a class contained in the package is used in the source Before showing you how to access classes stored in a package, let s explore how to define your own package You create a package by including the package statement as the first statement in your Java source file Classes defined within the source file become members of the package The package statement looks like this:
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package MyPackage;
This statement creates a package called MyPackage and places any classes defined in the source code into this package when the source code is compiled If you exclude the package statement in your source code, Java uses the default package to store your classes, which is the package used in examples throughout this book The default package has no name Programmers use the default package for sample programs, but they create their own packages for real-world applications You can use the same package statement in multiple source code files in order to have the classes stored in those files placed in the same package Programmers typically have many source code files whose classes are stored in the same package Java stores a package in a directory of the same name on your disk drive This means that the MyPackage package is stored in the directory MyPackage The name of the directory must exactly match the name of the package, and the package must always reside in that directory It is not unusual for programmers to create a hierarchy of packages, where a parent package is associated with a child package You will see this done all the time with the Java class library The Java class library consists of many hierarchical packages For example, Java GUI classes are stored with the following hierarchy:
javaawtimage
CHAPTER 7 Classes
In this case, java is the parent package, and awt is the child package, which is also a parent package to image You can create your own hierarchy of packages by specifying the package hierarchy in the package statement Each package in the hierarchy must be separated by a dot, as shown here:
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