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ok i fixed it , thanks a lot. i know what you mean now.:cool:

Sorry I don't know what you mean ? :-o

I created a object qq which belongs to the Nqueens class. Then use object qq to activate the method solution ( method solution in the Nqueens class).
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I need to solve the N queens problem (place n queens on a chess board size nxn so that the queens don't attack each other). Consist of 4 class :

Queen.java : hold the row and column of the queen...