random pin generation

Automatical random PIN generation has been all the more common now, especially in mobile applications. There is a very good utility around by Stephen Ostermiller, that lets you generate random sequences of arbitrary length and arbitrary alphabets. You can download the latest Ostermiller Utils from http://ostermiller.org/utils/ostermillerutils_1_06_00.jar and then use it directly from command line (java -classpath utils.jar com.Ostermiller.util.RandPass), or more commonly through your Java application:

String pass = new RandPass(new char[]{'A','B','C'}).getPass(8)