Thread: Random Number problem

This is my code:

    public background()
    {    
        super(8, 8, 60);
        setBackground("cell.jpg");
        maakland();
        maakdijk();
        maakWater();
    }
    public void maakland()
    {
        land[] land = new land[16];
        int b = 0;
 
        for (int y = 6; y < 8;){
 
            for (int x = 0; x < 8;){
 
                land[b] = new land();
                addObject(land[b], x, y);
                ++x;
                ++b;
            }
            ++y;
        }
    }
    public void maakdijk()
    {
        dijk[] dijk = new dijk[24];
        int b = 0;
 
        for (int y = 3; y < 6;){
            for (int x = 0; x < 8;){
 
                dijk[b] = new dijk();
                addObject(dijk[b], x, y);
                ++x;
                ++b;
            }
            ++y;
        }
    }
    public void maakWater()
    {
        Water[] Water = new Water[32];
        int b = 0;
 
        for (int y = 0; y < 3;){
            for (int x = 0; x < 8;){
 
                Water[b] = new Water();
                addObject(Water[b], x, y);
                ++x;
                ++b;
            }
            ++y;
        }
    }
    public void randomWater(int howMany)
    {
        for(int i=0; i<howMany; i++) {
           Water water = new Water();
            int x = Greenfoot.getRandomNumber(8);
            int y = Greenfoot.getRandomNumber(8);
        }
    }
}

As my backgrond i have the first 3 lines: Water second 3 lines: Dike (that needs to turn to water after playing the animation). third 2 lines: Land.

As you can see i made the background but like i said i want the dike (dijk) to turn into water using randomnumber.. or getoneobjectatoffset..
Any idea how i can do this?