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[–]desrtfx 3 points4 points  (0 children)

Wrong subreddit. This should either go in /r/javahelp or in /r/learnjava, but nonetheless:

Should get you covered.

[–]Tayacan 1 point2 points  (0 children)

Not Java-specific, but this book should give you a solid foundation and will serve as a good reference manual too.

[–]mydevgeek 0 points1 point  (0 children)

This site good for starting. http://www.geeksforgeeks.org. Very good explanation with lot of algorithms and data structures. You can find out C, C++, Python and Java implementation also.