Aperture - Crawler

Aperture is a open source java framework  for extracting and querying full-text content and metadata from various information systems (file systems, web sites, mail boxes, ...). It works good. It provides incremental crawling too. Its a awesome product i ever seen. Just take a look at this guys...:)

You can find more information from the below link.

http://aperture.sourceforge.net/

Java program for opening notepad

Coding
class demo {
public static void main(String a[]) {
Runtime r=Runtime.getRuntime();
Process p=null;
try {
p=r.exec("notepad");
}
 catch (Exception e) {
System.out.println("Error executing notepad");
}