ggkmath

I’m working through the example here:

http://www.vogella.com/articles/JavaPDF/article.html

In my file, I’ve got:

package com.mycompanyname.mydirectory;

import com.mycompanyname.OneOfMyClasses;
import com.itextpdf.text.Document;
...

 public class MyClass {
     ...
 }

Everything is working fine. What I don’t understand is that since I just copied the import statement directly from the link above for the iText portion — why does com.itextpdf.text.Document work?

I mean, if I look in directory com.mycompanyname I can see OneOfMyClasses.java there.

But in the com directly, there is no itextpdf directory (although maybe my user doesn’t have permission to see it(?)).

Hoping someone can help me understand what I’m missing here. Doesn’t the import point to a specific directory that I should be able to see the class? Is there a different com directory somewhere that iText is using, and com.itextpdf.text points to there? (if so, where’s the directory located)?

I installed the jar file for iText in the lib folder as per usual, and made sure it was included in the classpath.

Sam Peterson

I still don’t fully understand where I’m required to use the “public static void main(String[] args)” header within the .java files of a project. Do you need to put that header in every .java file of a package?

I have been following along with chapter 3 in my book, dragging and dropping downloaded stand alone book source files into my project’s package, but some of the .java files in my package don’t like that “public static void main(String[] args)” statement, even though my opening and closing curly braces are in the correct place. Here’s an example of one of those files (the ERROR(S) are described in the code’s comments):

    public class Rectangle
{
   public static void main(String[] args){
   private double length;//ERROR: illegal start of expression
   private double width;

   /**
    * Constructor
    */

   public Rectangle(double len, double w)
   {
      length = len;
      width = w;
   }

   /**
    * The setLength method accepts an argument
    * that is stored in the length field. 
    */

   public void setLength(double len)
   {
      length = len;
   }

   /**
    * The setWidth method accepts an argument
    * that is stored in the width field.
    */

   public void setWidth(double w)
   {
      width = w;
   }

   /**
    * The set method accepts two arguments
    * that are stored in the length and width
    * fields.
    */

   public void set(double len, double w)
   {
      length = len;
      width = w;
   }

   /**
    * The getLength method returns the value
    * stored in the length field.
    */

   public double getLength()
   {
      return length;
   }

   /**
    * The getWidth method returns the value
    * stored in the width field.
    */

   public double getWidth()
   {
      return width;
   }

   /**
    * The getArea method returns the value of the
    * length field times the width field.
    */

   public double getArea()
   {
      return length * width;
   }

}//end of: public static void main(String[] args)

}//end of: public class Rectangle  ERROR: class, interface, or enum expected

The ERROR(S) came up after I added the “public static void main(String[] args)” to the existing Rectangle.java file. Any idea of why this occurs?