Creating References Using Inheritance Hierarchies

AP Computer Science A· difficulty 2/5

public class Animal {}
public class Dog extends Animal {}
public class Cat extends Animal {}
// Usage:
Animal a = new Dog();
System.out.print(a instanceof Dog);
System.out.print(" ");
System.out.print(a instanceof Animal);
System.out.print(" ");
System.out.print(a instanceof Cat);

What is printed?

A
$false true false$
B
$true true true$
C
$true false false$
D
$true true false$
check_circle

Explanation

a refers to a Dog. instanceof Dog is true; instanceof Animal is true (Dog is-a Animal); instanceof Cat is false (Dog is not a Cat).

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