Added two java programming books.

633519ef · Joel David Gallant · 36a3aab4 · 633519ef
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 * [OSGi in Practice](http://njbartlett.name/files/osgibook_preview_20091217.pdf) (PDF)
 * [Category wise tutorials - J2EE](http://www.mkyong.com/)
 * [Introduction to Programming Using Java - David J. Eck](http://math.hws.edu/javanotes/index.html)
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+* [Effective Java](http://www.oracle.com/technetwork/java/effectivejava-136174.html)
+* [Introduction to Programming Using Java](http://math.hws.edu/javanotes/)

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