This is called the "PDFTron Hello World" application. It is easy to integrate the rest of PDFTron SDK if you are able to open, save and close a PDFDoc.

1. Create a new folder in Samples by the name HelloWorld.

2. In the HelloWorld folder, create a new file called HelloWorld.java, open and edit it using your favorite text editor.

3. Insert the following to your file:

   import java.io.File;
   import java.io.IOException;
   
   // These are the most important packages to import
   // for basic document manipulation. 
   import com.pdftron.common.PDFNetException;
   import com.pdftron.pdf.*;
   import com.pdftron.sdf.SDFDoc;
   
   import java.io.*;
   
   public class HelloWorld
   {
       // Just a simple setup for the application
       public static void main(String[] args)
       {
           // PDFNet must always be initialized before any PDFTron
           // classes and methods can be used
           PDFNet.initialize();
           System.out.println("Hello World!");
   
           // Most PDFTron operations are required to be wrapped in
           // a try-catch block for PDFNetException, or in a method/class that
           // throws PDFNetException
           try {
               // Creates a new PDFDoc object
               PDFDoc doc = new PDFDoc();
   
               // Creating a new page and adding it
               // to document's sequence of pages
               Page page1 = doc.pageCreate();
               doc.pagePushBack(page1);
   
               // Files can be saved with various options
               // Linearized files are the most effective
               // for opening and viewing quickly on various platforms
               doc.save(("linearized_ouput.pdf"), SDFDoc.SaveMode.LINEARIZED, null);
   
               doc.close();
           } catch (PDFNetException e) {
               System.out.println(e);
               e.getStackTrace();
           }
           PDFNet.terminate();
       }
   }

   To test that your code works, compile and run the code using a shell in the HelloWorld folder using:

   javac -cp .;../../Lib/PDFNet.jar HelloWorld.java
   
   java.exe -Djava.library.path=../../Lib -classpath .;../../Lib/PDFNet.jar HelloWorld

   Once you have successfully run this, you should see an output file in the working directory of this program.

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