$..4.$ A FastCritter moves twice as fast as a regular critter. When asked to move by n steps, it actually moves by $2*$ n steps. Implement a FastCritter subclass of Critter whose move method behaves as described. FastCritter.java Critter.java $1$ import java.util.ArrayList; $23/**4$ A simulated critter. $5*/6$ public class Critter $7\{8$ private int position; $9$ private ArrayList history; $101112$ Constructs a critter at position with blank history. $13*/14$ public Critter$()15\{16$ position $=0$; $17$ history $=$ new ArrayList$()$; $18\}1920/**21$ Gets the history of this critter. $22$ @return the history $23*/24$ public ArrayList getHistory $()25\{26$ return history; $272829/**30$ Adds to the history of this critter. $31$ @param newValue the desired state $32*/30$ Adds to the history of this critter. $31$ @param newValue the desired state $32*/33$ public void addHistory $($String event$)3435$ history.add$($event$)$; $36\}3738/**39$ Gets the position of this critter. $40$ @return the position $41*/42$ public int getPosition$()43\{44$ return position; $45\}4647/**48$ Moves this critter. $49$ @param steps the number of steps by which to move. $50*/51$ public void move$($int steps$)52\{53$ position $=$ position $+$ steps; $54$ addHistory$("$move to $"+$ position$)$; $55\}5657/**58$ The action of this critter in one step of the simulation. $59*/60$ public void act$()61\{62\}63\}$ FastCritterTester.java $1$ public class FastCritterTester $2\{3$ public static void main$($String$[]$ args$)4\{5$ Critter speedy $=$ new FastCritter$()$; $6$ speedy.move$(10)$; $7$ System.out.println$($speedy$.$getHistory $())$; $8$ System.out.println$("$Expected: $[$move to $20]")$; $9$ speedy.move$(-1)$; $10$ System.out.println$($speedy$.$getHistory$())$; $11$ System.out.println$("$Expected: $[$move to $20,$ move to $18]")$; $12\}13\}$