Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Write dry run of following program (java-oop)
public class Movie {
private String rating; private int ID; private String title;
public Movie() {
rating = ""; ID = 0; title = "";
7/3
}
public Movie(String aRating, int aID, String aTitle) {
rating = aRating; ID = aID;
title = aTitle;
}
public String getRating() {
return rating; }
public void setRating(String aRating) {
}
rating = aRating;
public int getID() {
return ID; }
public void setID(int aID) {
ID = aID; }
public String getTitle() {
return title; }
public void setTitle(String aTitle) {
title = aTitle; }
public double calcLateFees(int days) {
return 2.0 * days;
}
public boolean equals(Object obj) {
if(obj == null)
return false;
else if(getClass() != obj.getClass())
{
} }
Movie other = (Movie)obj;
return (rating.equals(other.rating) && ID == other.ID && title.equals(other.title));
return false; else
public String toString()
8/3
} }
{
return "\nMPAA Rating: " + rating + "\nID Number: " + ID + "\nMovie Title: " + title;
// Action.java
public class Action extends Movie {
public Action() {
super(); }
public Action(String aRating, int aID, String aTitle) {
}
super(aRating, aID, aTitle);
public double calcLateFees(int days) {
return 3.0 * days;
} }
// Comedy.java
public class Comedy extends Movie {
public Comedy() {
super(); }
public Comedy(String aRating, int aID, String aTitle) {
super(aRating, aID, aTitle);
}
public double calcLateFees(int days) {
return 2.5 * days;
} }
// Drama.java
public class Drama extends Movie {
public Drama() {
super(); }
} }
// MovieTest.java
public Drama(String aRating, int aID, String aTitle) {
super(aRating, aID, aTitle);
}
public double calcLateFees(int days) {
return 2.0 * days;
9/3
public class MovieTest {
public static void main(String[] args) {
Movie movie =
new Movie("PG-13", 3691, "Norm of the North"); Action action = new Action("G", 2587, "Eye In The Sky");
Comedy comedy = new Comedy("R", 7989, "Kung Fu Panda 3"); Drama drama =
new Drama("PG-13", 4563, "Batman v Superman");
System.out.println(movie);
System.out.println("Late Fee: $" + movie.calcLateFees(6));
System.out.println(action); System.out
.println("Late Fee: $" + action.calcLateFees(6));
} }
System.out.println(comedy); System.out
.println("Late Fee: $" + comedy.calcLateFees(6));
System.out.println(drama);
System.out.println("Late Fee: $" + drama.calcLateFees(6));
}
}
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