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Fool java into printing something it should not print

 
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The goal of this series of puzzles (eg: http://wouter.coekaerts.be/2012/puzzle-clowns, http://wouter.coekaerts.be/2012/puzzle-dreams) is to trick java to return unexpected or explicitly forbidden results.

and..... I'm stuck. I think it has something to do with spawning new threads so that private fields can be forced into unexpected states, but I'm not sure how.

 
Consider Paul's rocket mass heater.
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