Trying to create a Library using Java 8: How would I code these methods? - a ren

Question

Trying to create a Library using Java 8: How would I code these methods?

- a renewal method which allows the card holder to get a new  due date for that book. Renewal periods are in  two-week increments.

- a method which takes a date as a parameter and returns a list of books that are due on or before that date.

- a method that checks if any books are overdue. (Note: although in a real-world application, this would check for overdue books using today's date, ALSO create an additional method that takes a date as a parameter for ease of testing.)

- a method that returns a list of all the books checked out, sorted by due date.

Explanation / Answer

Hi,

Please see below the java classes and Sample output. Please comment for any queries/feedbacks.

Thanks,

Anita

Book.java

import java.util.Calendar;
import java.util.Date;

public class Book {

   private String name;
   private Date duedate;
   private boolean isCheckedOut;
  
  
   //Constructor
   public Book(String name, Date duedate, boolean checkedout){
       this.name=name;
       this.duedate = duedate;
       this.isCheckedOut = checkedout;
   }
  
  
   //Renew for Book
   public void renew(){
       Calendar cal = Calendar.getInstance();
       cal.setTime(duedate);
       cal.add(Calendar.DAY_OF_YEAR, 14); //Adding to weeks
       Date newDueDate = cal.getTime();
       setDuedate(newDueDate); //setting new due date to duedate
   }
  
   //Getters and setters
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public Date getDuedate() {
       return duedate;
   }
   public void setDuedate(Date duedate) {
       this.duedate = duedate;
   }
   public boolean isCheckedOut() {
       return isCheckedOut;
   }
   public void setCheckedOut(boolean isCheckedOut) {
       this.isCheckedOut = isCheckedOut;
   }
  
  
   //Overriding toString()
   public String toString(){
       String retString ="";
       retString = "Name : "+this.getName()+ ", Due : "+this.getDuedate();
       return retString;
   }
}

Library.java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;

public class Library {
   private ArrayList<Book> booklist ;
  
  
   //Constructorto craete booklist
   public Library(){
       this.booklist = new ArrayList();
   }

   //Renewal method
   public void renew(Book book){
       book.renew(); //Calling book.renew() to increment the duedate for two weeks
       System.out.println("Due Date is renewed as "+book.getDuedate()+" for "+book.getName());
   }
  
   //This method will return the list of books due on given date
   public ArrayList<Book> getBooksDueOn(Date date){
       ArrayList<Book> dueBooks = new ArrayList<Book>();
       for(Book book : this.getBooklist()){ //Looping through each book in the list
           if(book.getDuedate().before(date) && book.isCheckedOut() ){
               dueBooks.add(book);
           }
       }
       System.out.println("Books Due on date "+date+" are : ");
       System.out.println(Arrays.asList(dueBooks));
       return dueBooks;
   }

   //Checking if book is overdue or not
   public boolean overdue(Book book, Date dt){
       if(book.getDuedate().before(dt)){
           return true;
       }
       return false;
   }
  
  
   //This method will return the list of books which are checked out
   public ArrayList<Book> checkeOutBooks(){
       ArrayList<Book> checkedBooks = new ArrayList<Book>();
       for(Book book : this.getBooklist()){ //Looping through each book in the list
           if(book.isCheckedOut()){
               checkedBooks.add(book);
           }
       }
      
      
       //Sorting based on the due date using Comparator
       Collections.sort(checkedBooks, new Comparator<Book>() {
           public int compare(Book b1, Book b2){
               return b1.getDuedate().compareTo(b2.getDuedate());
           }
       });
      
       System.out.println("Checked out books are : ");
       System.out.println(Arrays.asList(checkedBooks));
       return checkedBooks;
   }
  
   //Getters and Setters
  
   public ArrayList<Book> getBooklist() {
       return booklist;
   }

  
   public void setBooklist(ArrayList<Book> booklist) {
       this.booklist = booklist;
   }

}

LibraryTester.java

import java.util.Date;

public class LibraryTester {

   public static void main (String [] args){
       Book book1 = new Book("Book1", new Date(), true);
       Book book2 = new Book("Book2", new Date(), true);
       Book book3 = new Book("Book3", new Date(), false);
      
       //Adding Books to the library
       Library library = new Library();
       library.getBooklist().add(book1);
       library.getBooklist().add(book2);
       library.getBooklist().add(book3);
      
       //renew
       library.renew(book1);
      
       library.getBooksDueOn(new Date());
       System.out.println("Checking over due for book1 :"+library.overdue(book1, new Date()));
       System.out.println("Checking over due for book2 :"+library.overdue(book2, new Date()));
       library.checkeOutBooks();
      
      
   }

}

Sample output:

Due Date is renewed as Sun Mar 12 03:47:19 IST 2017 for Book1
Books Due on date Sun Feb 26 03:47:19 IST 2017 are :
[[Name : Book2, Due : Sun Feb 26 03:47:19 IST 2017]]
Checking over due for book1 :false
Checking over due for book2 :true
Checked out books are :
[[Name : Book2, Due : Sun Feb 26 03:47:19 IST 2017, Name : Book1, Due : Sun Mar 12 03:47:19 IST 2017]]

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