Creating References Using Inheritance Hierarchies

AP Computer Science A· difficulty 3/5

public class Animal {}
public class Dog extends Animal {
    public void bark() { System.out.println("Woof"); }
}
Animal a = new Dog();
((Dog) a).bark();

What is printed?

A
$Woof$
check_circle
B
$Compile-time error$
C
$ClassCastException$
D
$nothing$

Explanation

The object is actually a Dog, so the downcast succeeds and bark() runs.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forward Predict my AP score

Related questions