Queue/Linked List in Java not setting properly -


i creating program complete "one tough puzzle" game using depth first search (irrelevant). have algorithm pretty complete. however, when poll() off queue, middle pieces same (explained below)

i using 1d array length of 9 type piece state class hold current board, available pieces, parent node

board gets set by:

    board = new piece[9];     for(int = 0; < 9; i++)         board[i] = new piece();

this code adds each piece middle of board, , adds queue (puzzle)

    for(int = 0; < 9; i++)     {         piece[] b = board;         b[4] = pieces[i];         piece[] p = removeelement(pieces, pieces[i]); // remove array         puzzle.add((new state(b, p, null)));     }

just simple test me show myself wasn't going crazy, used code

    while((s = puzzle.poll()) != null)     {         string ss = getavailable(s.returnpieces());         system.out.println("middle:"+s.returnboard()[4].getpieceid() + " :::: "+ ss);     }

this returned 

middle:9 :::: 2 3 4 5 6 7 8 9  middle:9 :::: 1 3 4 5 6 7 8 9  middle:9 :::: 1 2 4 5 6 7 8 9  middle:9 :::: 1 2 3 5 6 7 8 9  middle:9 :::: 1 2 3 4 6 7 8 9  middle:9 :::: 1 2 3 4 5 7 8 9  middle:9 :::: 1 2 3 4 5 6 8 9  middle:9 :::: 1 2 3 4 5 6 7 9  middle:9 :::: 1 2 3 4 5 6 7 8

as can see, b[4] 9, pieceid's correct. why on write every board object? no matter set last piece[#] to, uses pieceid every 1 of them.

pieces[7] = (new piece(diamond_in, heart_out, club_out, club_in, 8)); pieces[8] = (new piece(diamond_out, spade_out, diamond_in, heart_in, 9));


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