Given: interface Pet { } class Dog implements Pet { } public class Beagle extends Dog{ } Which three are valid?

The correct answer is A. Pet a = new Dog(); D. Dog d = new Beagle(); E. Pet e = new Beagle();. Not B, not C: Pet is abstact, cannot be instantiated. Not F: incompatible type. Required Beagle, found Dog.

Working with Inheritance

Question

Given:

interface Pet { } class Dog implements Pet { } public class Beagle extends Dog{ } Which three are valid?

Options

APet a = new Dog();
BPet b = new Pet();
CDog f = new Pet();
DDog d = new Beagle();
EPet e = new Beagle();
FBeagle c = new Dog();

How the community answered

(34 responses)

A
76% (26)
B
12% (4)
C
9% (3)
F
3% (1)

Explanation

Not B, not C: Pet is abstact, cannot be instantiated. Not F: incompatible type. Required Beagle, found Dog.

Topics

#polymorphism#inheritance#interfaces#type compatibility

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