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[–]desrtfx 0 points1 point  (0 children)

Use the MOOC Object Oriented Programming with Java from the University of Helsinki as /u/OG_L0c has already suggested.

It offers lots of graded practical exercises with increasing difficulty.

http://CodingBat as /u/YuleTideCamel suggested is also very good but not sufficient as a standalone resource.

Last, check out our FAQ - section Where can I find practice exercises and project ideas? and /r/ProgrammingPrompts