Library.java

/* This is a stub for the Library class */
import java.util.Enumeration;
import java.util.Hashtable;

public class Library extends Building{
  boolean hasElevator;
  private Hashtable<String, Boolean> collection; // 'collection' variable --> hastable

  /**
   * 
   * @param name name of library
   * @param address address of library
   * @param nFloors number of floors libraray has
   * @param hasElevator confirms that library has elevator
   */
  public Library(String name, String address, int nFloors, boolean hasElevator) { // Constructor from extention: building
    super(name, address, nFloors);
    this.collection = new Hashtable<String, Boolean>(); //owning 'collection' to memory + intiating "this.collection" to be a hastable holding a string and boolean
    System.out.println("You have built a library: 📖");
  }

  /**
   * 
   * @param address address of library
   */
  public Library(String address) {
    this(); // Call default constructor
    this.address = address; // Override address
  }

  /* Overloaded constructor with name, address */
  public Library(String name, String address) {
      super(name, address); // Call full constructor with hard-coded number of floors
  }

  // adding book to the library collection 
  /**
   * 
   * @param title title of book in the library's collection
   */
  public void addTitle(String title){ 
    this.collection.put(title, true);

  }

  // if the 'book' is in the library, it will remove it
  public String removeTitle(String title){
    if(this.collection.contains(name)){
      this.collection.remove(title);
      return title;
  }
    else{ // if the 'book' isn't in the collection
      System.out.println("This book is not in your collection.");
      return "";}
  }

  public void showOptions() {
    super.showOptions();
    System.out.println( " returnBook(title) \n + containsTitle(title) \n + isAvailable(name) \n + checkOut(name)\n + printCollection()");
  }

// Check out a book in 'this.collection'
  public void checkOut(String name){
    if(this.collection.contains(name)){ // checking if this is in the Library
      this.collection.get(name){ //gets the book from the Library
      System.out.println(name + "is availiable to rent out."); }//prints book + ____
    }
    // if the 'book' isn't in the collection, prints the string bellow
    else{
      System.out.println(name + "is not in your collection."); }//prints book + ____
  }

  // method for when a book is returned to the Library
  public void returnBook(String title){
    if(this.collection.contains(name)){  // checking if this is in the Library
      if(!this.collection.get(name)){ //gets the book from the Library
        this.collection.replace(name, false, true);
        System.out.println(name + "has been returned."); //prints book + ____
      }
    }

    else{
      System.out.println(name + "was never in your collection."); //prints book + ____
    }
  }

// true (yes) or false (no) if there is 'book' in Library
  public boolean containsTitle(String title){ 
    if(this.collection.contains(name)){ // checking if this is in the Library
      return true; // say yes
    }
    return false;
  }

    // returns true if the title appears as a key in the Libary's collection, false otherwise
  
    // if the house has an elevator 

  
  public void goToFloor(int floorNum) {
    super.goToFloor(floorNum);
    if (this.hasElevator == true){
        System.out.println("You are now on " + floorNum + ".");
    }
    else{
        System.out.println("Cannot go to " + floorNum + " without an elevator. Sorry.");
    }
  }
  
// method that gets availiablity for checkout status
/**
 * 
 * @param name name of library
 * @return name of book if it is in the library's collection
 */
  public boolean isAvailable(String name){ 
    if(this.collection.contains(name)){ // checking if this is in the Library
      if(this.collection.get(name)){ //gets the book from the Library
        return true;}
    }
    return false;
  }
  // returns true if the title is currently available, false otherwise


  // prints out the entire collection in an easy-to-read way (including checkout status)
  public void printCollection(){
    Enumeration <String> collection = this.collection.keys();
    while (collection.hasMoreElements()){
      String books = collection.nextElement();
      System.out.println("Books:" + books +", Checkout status: "+ this.collection.get(collection)); // prints checkout status)
    }
  }
  public static void main(String[] args) {
    Library Neilson = new Library("Neilson", "1 Drive St.", 4, true);
  }

  }