This is what the design might look like for a Wombat style scenario where the wombat walks around and eats leaves while avoiding rocks. This is a very simple example, but it is intended to give you the feel for what is expected in a design. The outline format is intentional as it helps to organize things. You should consider doing that in your own design.

• Wombat Class
  • Member Data
    • leavesEaten - this is an integer counting how many leaves have been eaten.
    • direction - this integer stores a number for the direction that the wombat is heading.
  • Methods
    • void act() - This method will check if the wombat is on the same square as a leaf. It if it, it eats the leaf. If it isn't, it will check if it can move. If it can then it does. If it can't, it will turn left.
    • void turnLeft() - This method turns the wombat to the left. This involves changing the direction member variable and calling setRotation to alter the image orientation.
    • boolean canMove() - This method checks to see if the wombat is able to move forward. It returns a boolean telling whether ot not it can. The check itself involves seeing if the move would take it out of bounds or if it would put it on top of a rock.
    • void eatLeaf() - tells the wombat to eat one leaf at the current location. It also increments the number of leaves eaten.
    • boolean foundLeaf() - Returns a boolen telling whether to not the wombat is standing on a square with a leaf.
    • void move() - Move the wombat forward one square in the current direction using setLocation.
• Leaf Class - This class doesn't store anything or have any methods that do anything. It just sits in the world and waits until a Wombat comes up to eat it.
• Rock Class - This class doesn't store anything or have any methods that do anything. It is placed in the world and blocks the path of any Wombat that runs into it.