How do you create boxBounce in blue j?

To create a boxBounce effect in BlueJ, you can utilize a simple animation loop that updates the position of a rectangle (the box) on the screen. First, create a class that extends the Canvas class and override the paint method to draw the box. Then, implement a loop that alters the box's coordinates, checks for boundary collisions, and reverses the direction accordingly. Use a timer or a thread to continuously repaint the canvas, creating the bouncing effect.