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LibraryItem.java

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abstract class LibraryItem {

protected String title;

protected String publisher;

public LibraryItem(String title, String publisher) {

this.title = title;

this.publisher = publisher;

}

public abstract String getItemDetails();

public abstract String calculateDueDate();

}

class Book extends LibraryItem {

private final String author;

public Book(String title, String publisher, String author) {

super(title, publisher);

this.author = author;

}

@Override

public String getItemDetails() {

return "Book Title: " + title + ", Publisher: " + publisher + ", Author: " + author;

}

@Override

public String calculateDueDate() {

return "Due date is in 14 days";

}

}

class Journal extends LibraryItem {

private final String issueNumber;

public Journal(String title, String publisher, String issueNumber) {

super(title, publisher);

this.issueNumber = issueNumber;

}

@Override

public String getItemDetails() {

return "Journal Title: " + title + ", Publisher: " + publisher + ", Issue Number: " + issueNumber;

}

@Override

public String calculateDueDate() {

return "Due date is in 7 days";

}

}

class DVD extends LibraryItem {

private final String director;

public DVD(String title, String publisher, String director) {

super(title, publisher);

this.director = director;

}

@Override

public String getItemDetails() {

return "DVD Title: " + title + ", Publisher: " + publisher + ", Director: " + director;

}

@Override

public String calculateDueDate() {

return "Due date is in 2 days";

}

}