Question

Consider the Animal, Bird, and Cardinal classes shown below. Which of the following object declarations will compile without error? public class Animal { /* constructors and methods not shown / } public class Bird extends Animal { / constructors and methods not shown / } public class Cardinal extends Bird { / constructors and methods not shown */ } Cardinal red = new Cardinal(); Animal tweety = new Bird(); Bird chirpy = new Cardinal(); I only II only III only I, II and III II and III only

          Consider the Animal, Bird, and Cardinal classes shown below. Which of the following object declarations will compile without error?

public class Animal
{
   /* constructors and methods not shown */
}

public class Bird extends Animal
{
   /* constructors and methods not shown */
}

public class Cardinal extends Bird
{
   /* constructors and methods not shown */
}


Cardinal red = new Cardinal();
Animal tweety = new Bird();
Bird chirpy = new Cardinal();
 I only
 II only
 III only
 I, II and III
 II and III only

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Added by Lilly B.

Barron's AP Computer Science A

Roselyn Teukolsky 7th Edition

Chapter 3

Instant Answer

Solved by Expert Eduard Sanchez

06/04/2024

Step 1

We have three classes: Animal, Bird, and Cardinal. Bird extends Animal, meaning Bird is a subclass of Animal. Cardinal extends Bird, meaning Cardinal is a subclass of Bird (and also indirectly a subclass of Animal). Show more…

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Consider the Animal, Bird, and Cardinal classes shown below. Which of the following object declarations will compile without error? public class Animal { /* constructors and methods not shown */ } public class Bird extends Animal { /* constructors and methods not shown */ } public class Cardinal extends Bird { /* constructors and methods not shown */ } Cardinal red = new Cardinal(); Animal tweety = new Bird(); Bird chirpy = new Cardinal(); I only II only III only I, II and III II and III only

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