To Make a PDF using Images [ iText.jar ]

Document d=new Document();
PdfWriter.getInstance(d, new FileOutputStream("op.pdf"));

d.open();
Image img1 = Image.getInstance("hellsing.jpg");
d.add(img1);
d.close();

To start a process with ProcessBuilder

try {
ProcessBuilder proc = new ProcessBuilder("notepad.exe", "testfile");
proc.start();
} catch (Exception e) {
System.out.println("Error executing notepad.");
}

To open a file in it's editor [Default]

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;

public class Main {
public static void main(String[] a) {
try {
Desktop desktop = null;
if (Desktop.isDesktopSupported()) {
desktop = Desktop.getDesktop();
}

desktop.edit(new File("hellsing.jpg"));
} catch (IOException ioe) {
ioe.printStackTrace();
}


}
}

Code for Browsing a Site when uninstalling of installing Application

import java.awt.Desktop;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

public class Main {
public static void main(String[] a) {
try {
URI uri = new URI("http://www.java2s.com");

Desktop desktop = null;

if (Desktop.isDesktopSupported()) {
desktop = Desktop.getDesktop();
}

if (desktop != null)
desktop.browse(uri);
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (URISyntaxException use) {
use.printStackTrace();
}

}
}