Modify the Instructor class below by overriding the hashCode and equals methods. Then write a class that stores several Instructor objects in a HashSet. The class should be able to display all the instructors in the set, and allow the user to search for an instructor. Demonstrate the class in an application. Below is the instructor class. ============================================================== /** This class stores data about an instructor.*/public class Instructor{ private String lastName; // Last name private String firstName; // First name private String officeNumber; // Office number /** This constructor initializes the last name, first name, and office number. @param lname The instructor's last name. @param fname The instructor's first name. @param office The office number. */ public Instructor(String lname, String fname, String office) { lastName = lname; firstName = fname; officeNumber = office; } /** The copy constructor initializes the object as a copy of another Instructor object. @param object2 The object to copy. */ public Instructor(Instructor object2) { lastName = object2.lastName; firstName = object2.firstName; officeNumber = object2.officeNumber; } /** The set method sets a value for each field. @param lname The instructor's last name. @param fname The instructor's first name. @param office The office number. */ public void set(String lname, String fname, String office) { lastName = lname; firstName = fname; officeNumber = office; } /** toString method @return A string containing the instructor information. */ public String toString() { // Create a string representing the object. String str = "Last Name: " + lastName + "\nFirst Name: " + firstName + "\nOffice Number: " + officeNumber; // Return the string. return str; }

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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Modify the Instructor class below by overriding the hashCode and equals methods. Then write a class that stores several Instructor objects in a HashSet. The class should be able to display all the instructors in the set, and allow the user to search for an instructor. Demonstrate the class in an application.

Below is the instructor class.

==============================================================

/** This class stores data about an instructor.*/public class Instructor{ private String lastName; // Last name private String firstName; // First name private String officeNumber; // Office number /** This constructor initializes the last name, first name, and office number. @param lname The instructor's last name. @param fname The instructor's first name. @param office The office number. */ public Instructor(String lname, String fname, String office) { lastName = lname; firstName = fname; officeNumber = office; } /** The copy constructor initializes the object as a copy of another Instructor object. @param object2 The object to copy. */ public Instructor(Instructor object2) { lastName = object2.lastName; firstName = object2.firstName; officeNumber = object2.officeNumber; } /** The set method sets a value for each field. @param lname The instructor's last name. @param fname The instructor's first name. @param office The office number. */ public void set(String lname, String fname, String office) { lastName = lname; firstName = fname; officeNumber = office; } /** toString method @return A string containing the instructor information. */

public String toString() { // Create a string representing the object. String str = "Last Name: " + lastName + "\nFirst Name: " + firstName + "\nOffice Number: " + officeNumber; // Return the string. return str; }}

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