For item 12-15, consider the following: public class Appliance {public int getVoltage() { return 10; }Appliance.javapublic interface Vehicle {public int getMileage();}Vehicle.javaclass ElectricCar extends Appliance implements Vehicle {public int getVoltage() { return 5; }public int getMileage() { return 100; }}ElectricCar.javaApplianceVehicleElectricCar12. Is the following code valid or invalid? Vehicle v = new ElectricCar();ValidInvalid13. What is the output of the following code? Appliance a = new ElectricCar();System.out.println(a.getMileage());O 10O 100Compile error 14. What is the output of the following code? Appliance a = new ElectricCar();System.out.printIn(a.getVoltage());510100Compile error15. What is the output of the following code? Appliance a = new ElectricCar();System.out.printIn(a instanceof Vehicle);truefalseCompile error

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public class Appliance { public int getVoltage() { return 10; } Appliance.java public interface Vehicle { public int getMileage(); } Vehicle.java class ElectricCar extends Appliance implements Vehicle { public int getVoltage() { return 5; } public int getMileage() { return 100; } ElectricCar.java Appliance Vehicle ElectricCar 12. Is the following code valid or invalid? Vehicle v = new ElectricCar(); O valid O Invalid 13. What is the output of the following code? Appliance a = new ElectricCar(); System.out.println(a.getMileage()); O 5 O 10 O 100 O Compile error

public class Appliance { public int getVoltage() { return 10; } Appliance.java public interface Vehicle { public int getMileage(); } Vehicle.java class ElectricCar extends Appliance implements Vehicle { public int getVoltage() { return 5; } public int getMileage() { return 100; } ElectricCar.java Appliance Vehicle ElectricCar 12. Is the following code valid or invalid? Vehicle v = new ElectricCar(); O valid O Invalid 13. What is the output of the following code? Appliance a = new ElectricCar(); System.out.println(a.getMileage()); O 5 O 10 O 100 O Compile error

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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