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Varia HowTo

• Unique ID
  • Use System time to generate unique ID
  • Get a unique identifier
  • Get the hard disk serial number or Motherboard Serial number
• Algorithm
  • Sort an array 1
  • Sort an array 2
  • Do a selection sort
  • Validate a Social Security Number (canadian)
  • Validate a Credit Card Number
• Class
  • Obtain from where a Class is loaded
  • Get the class name with or without the package
  • See the generated bytecode
• Interesting
  • Self-replicating programs
  • A curiosity
  • Common Bugs
  • Number of the beast! :-)
• Scripting engine (JDK1.6)
  • Use Java scripting engine (JDK 1.6)
  • Pass or retrieve values from a scripting engine (JDK 1.6)
• Misc
  • Preventing multiple instances of an application
  • Trap JVM shutdown
  • Minimize all programs on Windows to show the Desktop
  • Display a progress indicator in the console

Varia HowTo

Written and compiled by Réal Gagnon ©1998-2013
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