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Given that EOFException is a subclass of IOException, what isthe output of the following application?package ai;import java.io.*;class Machine {public boolean turnOn() throws EOFException {returntrue;}}public class Robot extends Machine {public boolean turnOn() throws IOException {returnfalse;}public static void main(String[] doesNotCompute)throws Exception {Machine m = new Robot();System.out.print(m.turnOn());}}A. trueB. falseC. The code does not compile. D. The code compiles but produces an exception at runtime.Question 1AnswerABDC

Question

Given that EOFException is a subclass of IOException, what isthe output of the following application?package ai;import java.io.*;class Machine {public boolean turnOn() throws EOFException {returntrue;}}public class Robot extends Machine {public boolean turnOn() throws IOException {returnfalse;}public static void main(String[] doesNotCompute)throws Exception {Machine m = new Robot();System.out.print(m.turnOn());}}A. trueB. falseC. The code does not compile. D. The code compiles but produces an exception at runtime.Question 1AnswerABDC

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Solution

The output of the given Java application will be "false".

Here's the step by step explanation:

  1. The main method creates a new instance of Robot but assigns it to a Machine reference (Machine m = new Robot();). This is allowed because Robot is a subclass of Machine.

  2. It then calls the turnOn() method on the Machine reference (m.turnOn()).

  3. Since the actual object is a Robot, it's the Robot's turnOn() method that gets called, not the Machine's. This is a concept in Java known as method overriding.

  4. The Robot's turnOn() method returns false, so "false" is printed to the console.

So, the correct answer is B. false.

This problem has been solved

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