Q3. Classes More 1

We have NoisyDog and SportsFan classes to practice working with abstract classes and implementing interfaces.

NoisyDog

Write the abstract class Noisy and the subclass NoisyDog.

    public abstract class Noisy {
        // add any variables you need
        public Noisy (int n);

        // print the designated noise one time
        public abstract void noise();
        
        // print the designated noise N times
        public void makeNoise();
    }

    public class NoisyDog extends Noisy {
        // "bark" three times by default
        public NoisyDog(); 
        
        // prints the bark string 3 times
        public NoisyDog(String bark);

        // Also need to implement this
        public void noise();
    }

SportsFan

    public interface SportsFan { 
        String cheer();
        String boo();
    }

1. Make a BoorFan class that implements the SportsFan interface. A BoorFan does not cheer, so just return the empty string for that method. A BoorFan returns "You stink!" when booing.

2. Make a GetRowdy class that cheers twice, separated by spaces, when asked to cheer. It boos three times.

    public class GetRowdy implements SportsFan {
        public GetRowdy (SportsFan p) {
            // write this
        }
        // other methods required 
    }
   

3. A DolphinFan says "flip" to cheer and "glub" to boo. Make the DolphinFan class.

4. The following code has some OK parts and some errors. Which lines are errors? If a line is not an error, explain what happens when you call the cheer() method of that object.

    public void demo() {
        SportsFan s = new SportsFan();  // 1
        SportsFan t = new BoorFan();    // 2
        BoorFan b = new SportsFan();    // 3
        GetRowdy r = new GetRowdy();    // 4
        GetRowdy rr = new GetRowdy(t);  // 5
        GetRowdy d = 
           new GetRowdy(new DolphinFan()); // 6
   
        /* Call cheer() on all of them. What do they do? */ 
    }