need help in locking or synchronization

[samanyu]

exactly, but when i do it, sometimes the first few columns do not get repainted. Why? What are your processor's specs? Speed?

[Norm]

I'm using XP on 1.8GHz single cpu

[samanyu]

Dear Norm,
here is the modification for the grid, just add this code fragment to the constructor in iteration2.

for(int i=0; i<width; i++)
{
cells[i][16] = 1;
}

should do the trick. :) i think.

[Norm]

Nothing happens when I added it:

    Iteration2( int w, int h){
       width = w;
       height = h;
       cells  = new int[w][h];
       buffer = new int[w][h];
       // Set some for debug
         for(int i=0; i<width; i++) {
            cells[i][16] = 1;
         }
         System.out.println("init done");
    }

[samanyu]

Solved the problem, thanks for the help.
You're one patient volunteer. Kudos.