Chapter 15: Problem 14

Will the statement pAnimal = new Cat: compile?

Short Answer

Expert verified

Answer: Yes, the statement "pAnimal = new Cat;" will compile without any errors, given that Cat is a subclass of Animal.

Step by step solution

Determine the Class Hierarchy

First, we need to identify the class hierarchy of the classes Animal and Cat. In most cases, we can assume that Animal is a superclass (base class) and Cat is a subclass (derived class). If Cat extends (inherits from) Animal, then it should be possible to create an object of type Cat and assign it to a reference variable of type Animal.

Write an Example

Let's create an example to better illustrate the statement's behavior: ```java class Animal { ... } class Cat extends Animal { ... } public class Main { public static void main(String[] args) { Animal pAnimal; pAnimal = new Cat(); } } ```

Analyze the Assignment Statement

In this example, we have the class Animal as a superclass, and Cat is its subclass (inherits from Animal). The statement "pAnimal = new Cat();" assigns a new instance of the Cat class to a reference variable of type Animal.

Conclusion

Given that Cat is a subclass of Animal, it can be instantiated and assigned to a reference variable of type Animal with no compilation issues. Therefore, the statement "pAnimal = new Cat();" will compile without any errors.

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Will the statement pAnimal = new Cat: compile?

Short Answer

Step by step solution

Determine the Class Hierarchy

Write an Example

Analyze the Assignment Statement

Conclusion

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