Problem
1. Write a program that animates a car so that it moves across a frame.
2. Write a program that animates two cars moving across a frame in opposite directions (but at different heights so that they don't collide.)
3. Write a program that displays a scrolling message in a panel. Use a timer for the scrolling effect. In the timer's action listener, move the starting position of the message and repaint. When the message has left the window, reset the starting position to the other corner. Provide a user interface to customize the message text, font, foreground and background colors, and the scrolling speed and direction.