Consider the three classes Alpha, Beta, and Gamma. Which of the following is/are true (choose all that apply)? a. Alpha is a subclass of Beta b. Beta is a subclass of Gamma c. Gamma is a superclass of Alpha d. Beta is a superclass of Alpha public class Alpha extends Gamma { public String getTwo() { return("2"); } public String getTwo(int i) { return("two"); } } public class Beta extends Gamma{ public String getThree() { return ("3"); } public String getFour() { return ("four"); } } public abstract class Gamma { public String getOne() { return ("1"); } public String getFour() { return("4"); }

Consider the three classes Alpha, Beta, and Gamma. Which of the following is/are true (choose all that apply)? a. Alpha is a subclass of Beta b. Beta is a subclass of Gamma c. Gamma is a superclass of Alpha d. Beta is a superclass of Alpha public class Alpha extends Gamma { public String getTwo() { return("2"); } public String getTwo(int i) { return("two"); } } public class Beta extends Gamma{ public String getThree() { return ("3"); } public String getFour() { return ("four"); } } public abstract class Gamma { public String getOne() { return ("1"); } public String getFour() { return("4"); }

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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In this assignment, you will make two classes,Student and Instructor, that inherit from a superclass Person. The implementation of class Person is given below. public class Person{private String name;private int age; public Person(){name="";age=0;}/**Create a person with a given name and age.@param name the name@param age the age*/public Person(String name, int age){this.name = name;this.age = age;} /**Get the name.@return the name*/public String getName(){ return name;}/**Change the name.@param name the name*/public void setName(String name){ this.name = name;}/**Get the age.@return the age*/public int getAge(){ return age;}/**Change the age.@param age the age*/public void setAge(){ this.age = age;}/**Convert person to string form.*/public String toString(){return "Name: " + name + "\t" + "Age: " + age;}} You will also need to write a test program to test the methods you write for these two classes. The implementation details are described as follows. Stage 1:In the first file…