• Gcal
  Gcal calculates and prints calendars. It displays hybrid and proleptic Julian and Gregorian calendar sheets, respectively for one month, three months, or a whole year. It also displays eternal holiday lists for many countries around the globe, and can create fixed date lists to be used as reminders. Gcal can calculate various astronomical data and times of the Sun and the Moon at any location, precisely enough for most civil purposes. It also supports various other calendar systems including the Chinese and Japanese calendars, the Hebrew calendar, and the civil Islamic calendar.
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• Singleton in Java
  How to implement the Singleton design pattern in Java (SUN)
  Whether you're creating software for mobile devices, desktops, enterprise systems, the Internet, or games, java.sun.com gets you what you need: code samples, developer tools, downloads, open-source projects, resource centers, and support.
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  in Development > UML & Patterns with design development java patterns singleton sun uml

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