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CHAPTER 7 Classes
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You place class definitions of other classes outside of the Java application class definition Here s an example of how this is done This example is a valid Java application It will compile, but nothing happens when you run it because the main() method doesn t contain any statements
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Class Demo { public static void main (String args[]) { } } class myClass { }
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A member method is defined nearly identically to the way a method is defined, which you learned how to do in 6 However, there are two differences First, the definition of a method member must be placed within the body of a class definition The other difference is that you must include an access specifier, which tells Java how the method member can be called within the Java program (see Access Specifiers next in this chapter) As you ll recall from 6, a method definition consists of a method name, an argument list, a return value, and the body of the method The method name is used to call the method within your Java program The argument list is used to provide the method with information needed for it to perform a task An argument list is optional If a method has all the information necessary to perform a task, an argument list isn t necessary If a method needs information to perform the task, an argument list is required The return value is information returned by the method to the statement that called the method The return value is also optional because not every method needs to return a value The body of the method is defined using an opening and closing brace within which you place the statements to be executed when the method is called by a statement in your program
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Access Specifiers
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Each member of a class has an access specifier that tells Java how that member can be accessed by other parts of the program The three types of access specifiers are public, private, and protected
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A class member designated as public can be accessed by any part of the program as long as an instance of the class is created before the member is accessed Many methods are designated as public in order for parts of the program to call those methods The exception to this rule involves public static members of a class You can access a public static member of a class without first creating an instance of the class A class member designated private can be accessed only by members of the same class A private member cannot be accessed by other parts of the program Many instance variables are designated as private in order to protect them from other parts of the program Typically, only method members of the class can access instance variables A class member designated protected can be accessed by method members of the same class and by method members of a class that inherits the class It can also be accessed by classes in the same package (see Packages later in this chapter) You ll learn about inheritance in 8 Other parts of the program cannot access a protected member of a class Some method members and maybe a few instance variables are designed as protected, depending on the nature of the program You place the access specifier to the left of the data type of a method member definition and to the left of the data type when declaring an instance variable, which you ll see later in this chapter You do not have to include the access specifier If you exclude an access specifier, Java assumes that the member is designated public, making it available to all parts of the program that are in the same package as the class The following example shows how to define a method member called print(), which is a member of the myClass class This method displays text that is received from the statement that calls the method There isn t a return value, and the method can be accessed by any part of the program You ll notice that the body of the main() method contains no statements, so nothing happens when this program runs
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class Demo { public static void main (String args[]) { } } class myClass { public void print(String str){ Systemoutprintln(str); } }
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