Question

JAVA

You are given a class Critter which represents an animal. Critter class will be the superclass of a set of subclasses classes. A Critter has a weight and a position on a number line. The constructor initializes the position to 0 and sets the weight from the parameter. Critter has an ArrayList of Strings to keep a log of its activities. It has other methods which you can view here

You are to implement the following subclasses of Critter

OverAchievingCritter: A OverAchievingCritter always does more than asked. If you tell an OverAchievingCritter to move 5, it will actually move 10 steps. You will override the move method.

LethargicCritter: A LethargicCritter only has two activities: eat and sleep. When asked to move, it will either eat or sleep. A LethargicCritter is created hungry so the first time its move method is called, the LethargicCritter should eat. (and add the word "eat" to the history. The next time the move method is called, the LethargicCritter will sleep (and add the word "sleep" to the history). It will continue to alternate activities in this manner.

UnpredictableCritter: A UnpredictableCritter is very stubborn. It only moves when it feels like it. You will override the move method. If you call the UnpredictableCritter's move method, sometimes it will move and sometimes it will not. The decision is totally random. In the conctructor construct a Random object with a seed 543212345. You can use Random's nextBoolean method or nextInt with a parameter of 1 to help you determine if the Critter should move.

Note: There are two testers for this problem.

I have most of the code done and only need help with the UnpredictableCritter. I probably have the random.nextBoolean() wrong.

OverAchievingCritter.java

public class OverAchievingCritter extends Critter {

public OverAchievingCritter(double theWeight) {

super(theWeight);

}

@Override public void move(int steps)

{

super.move(steps * 2);

}

}

LethargicCritter.java

public class LethargicCritter extends Critter {

private int activity;

public LethargicCritter(double theWeight) {

super(theWeight);

}

@Override public void move(int steps) {

if(activity == 0) {

addHistory("eat");

activity = 1;

} else {

addHistory("sleep");

activity = 0;

}

}

}

UnpredictableCritter.java

import java.util.Random;

public class UnpredictableCritter extends Critter {

public UnpredictableCritter(double theWeight) {

super(theWeight);

}

@Override public void move(int steps) {

Random random = new Random(543212345);

if(random.nextBoolean()) {

super.move(steps);

}

}

}

http://www.codecheck.it/files/19080222193b3bnz0p3ezmmwh5lrj69a4tv

Answer 1

If you have any problem with the code feel free to comment.

Program

import java.util.Random;

public class UnpredictableCritter extends Critter {
  
   private Random random;//create a random instance variable

   public UnpredictableCritter(double theWeight) {

       super(theWeight);
       random = new Random(543212345);//initialize in the constructor

   }

   @Override
   public void move(int steps) {
       if (random.nextBoolean()) {

           super.move(steps);

       }

   }

}

Output