[hardwired]

Declare "box" as a member variable and use setLocation to move/position it in the paint method.

Code:

    int appletsize_x = 300;
    int appletsize_y = 300;
    Rectangle box = new Rectangle(60, 25);

        Graphics2D g2 = (Graphics2D) g;
        box.setLocation(x_pos,y_pos);
        g2.draw(box);

Then when it is time for collision–checking in your ball Runnable you can get access to the box as an obstacle with

Code:

int minX = box.x;
int maxX = box.x + box.width;
int maxY = box.y + box.height;