Java Scrolling Game - Moving Image When Key Is Pressed

Okay, gotta be able to move the image when a key is pressed. When I test it, the image moves, but leaves the old image behind.

package Game;
import java.awt.Component;
import javax.swing.JOptionPane;
 public class Game
{
private Grid grid; //holds the grid used to store and display images
private int userRow; //keep track of which row the user-controlled image appears in
private int msElapsed; //keep track of the total amount of milliseconds that have elapsed since the start of the game

[Code] ....

Here is what I was given on instructions:

Complete the handleKeyPress method. Write the following line of code in the handleKeyPress method to check for a key press:

int key = grid.checkLastKeyPressed();

If the user pressed the up arrow (key == 38), move the user's image up one row (unless the user is already in the top row). Likewise, if the user pressed the down arrow (key == 40), move the user's image down one row (unless the user is already in the bottom row). Either way, make sure to update userRow.

Movement of the image can be accomplished by changing the value of userRow. Study how the initial image is displayed in the game constructor, then

Set the current image location to null

Update userRow to the new location and,

Set the image in the new value of userRow.

You should be able to move the user image up and down, and you should be prevented from moving the image off the screen.