Practical Coding in Java

//
// Person.java
//


// The Person class is defined in Person.java


public class Person
{
    // The constructor function is called when new Person object is
    // created.  Member variables should be initialized here.  Note
    // that constructors do not return a value.

    public Person(String nameIn)
    {
        name = nameIn;
    }

    // public functions can be called from outside the class

    public void greeting()
    {
        System.out.println("Hello, my name is " + name);
        System.out.println("and I have " + noseCount + " nose.\n");
    }

    // public accessor functions can be used to give (read-only)
    // access to private member variables

    public String getName()
    {
        return name;
    }

    // private member variables cannot be accessed directly from
    // outside the class

    private String name;

    // static == shared by all objects of the class
    // final == variable cannot be changed (after initialization)
    // e.g Math.PI and Math.E (public static final)

    private static final int noseCount = 1;
}

//
// PersonTest.java
//


public class PersonTest
{
    public static void main(String[] args)
    {
        // create a new Person object

        Person drkessner = new Person("Dr. Kessner");

        // call the greeting() and getName() functions

        drkessner.greeting();

        System.out.println("That guy's name is " + 
            drkessner.getName() + "\n");

        // create another Person object

        Person gadget = new Person("Gadget");
        gadget.greeting();
    }
}