Core Java · interview question

Why does the following code not compile?

Multiple choiceHardchapter-5-curatedpremiumcore-javaupcasting-and-dynamic-dispatch

java

abstract class Service { abstract void execute(); }
class Shipping extends Service { void execute(); }
public class Main { public static void main(String[] args) { Service s = new Shipping(); s.execute(); } }

The execute method in the superclass is not defined.The abstract method is missing a body in the subclass.The subclass does not implement the abstract method properly.The method in the subclass is not marked as @Override.

Answer and explanation

Correct answer

B. The abstract method is missing a body in the subclass.

Why

In Java, an abstract method does not have a body in the superclass, but it must be provided a concrete implementation in the subclass. The subclass must correctly implement all abstract methods from the superclass.

Test yourself on Core Java

A free test with instant, explained results. No account needed.

Start free test

All Core Java questions →

Why does the following code not compile?

Correct answer

Why

More Core Java questions