Something

import greenfoot.*;  // (World, Actor, GreenfootImage, and Greenfoot)

import java.util.List;
import java.util.ArrayList;
import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.swing.*;

public class Tux extends Mouse
{
    private static final int EAST = 0;
    private static final int WEST = 1;
    private static final int NORTH = 2;
    private static final int SOUTH = 3;

    private int direction;
    
    private GreenfootImage tuxRight;
    private GreenfootImage tuxLeft;
    
    
    public Tux()
    {
        super("Tux","Ryan","Orcimsoft");
        tuxRight  = getImage();
        tuxLeft = new GreenfootImage(getImage());
        tuxLeft.mirrorHorizontally();     
        tuxLeft.scale(20,20);
        tuxRight.scale(20,20);
    }
    
    public void act() 
    {
         int x = getX();
         int y = getY(); 
         int num;
        
         World myWorld = getWorld();
         num = Greenfoot.getRandomNumber(4) +1;
            if(num ==1)
            {
                List Brick = myWorld.getObjectsAt(x, y-2, Brick.class);
                if (Brick.isEmpty()) 
                    { y = getY() -4; }
                }
            if(num ==2)
            {
                List Brick = myWorld.getObjectsAt(x, y+2, Brick.class);
                if (Brick.isEmpty())
                    {y = getY() + 4; }
                }
            if(num ==3)
            {
                List Brick = myWorld.getObjectsAt(x-2, y, Brick.class);
                if (Brick.isEmpty())
                    {x = getX() - 4; }
                }
            if(num ==4)
            {
                List Brick = myWorld.getObjectsAt(x+2, y, Brick.class);
                if (Brick.isEmpty())
                    {x = getX() + 4; }
                }
    }

    /* Cosmetic stuff, just setting direction of image */
     public void setDirection(int direction)
    {
        this.direction = direction;
        switch(direction) {
            case SOUTH :
                setImage(tuxRight);
                setRotation(90);
                break;
            case EAST :
                setImage(tuxRight);
                setRotation(0);
                break;
            case NORTH :
                setImage(tuxLeft);
                setRotation(90);
                break;
            case WEST :
                setImage(tuxLeft);
                setRotation(0);
                break;
            default :
                break;
        }
}
}