task number 2 please. we are using ADT Bag. the first two pictures are for task

Question

task number 2 please. we are using ADT Bag. the first two pictures are for task 1. Thank you.

public interface Pilelnterface k* Adds a new book to the pile of books @param book is the object to be added to pile public void addBook(T book); kx * Removes a book from the file * @return the top book from the pile public T removeBook0; * Gets reference to the top book of this pile kx *@return top book of the pile public T topBook0; *checks if is empty kx * areturn true if the pile contains no elements and false otherwise

Explanation / Answer

import java.util.*;

class PileOfBooks implements PileInteface{
    ArrayList<T> pileOfBooks;

    public PileOfBooks(){
        pileOfBooks = new ArrayList<>();
    }

    public void addBook(T book){
        pileOfBooks.add(book);
    }

    public T removeBook(){
        //if there is no book in the pile
        if(isEmpty()){
            System.out.println("Pile is empty.")
            return null;
        }

        T bookRemoved = pileOfBooks.get(0);
        pileOfBooks.remove(0);
        return bookRemoved;
    }

    public T topBook(){
        //if there is no book in the pile
        if(isEmpty()){
            System.out.println("Pile is empty.")
            return null;
        }

        return pileOfBooks.get(0);
    }

    public boolean isEmpty(){
        if(size() == 0){
            return true;
        } else {
            return false;
        }
    }

    public int size(){
        return pileOfBooks.size();
    }

    public String toString(){
        String contents = "";

        for(int i = 0; i < size(); i++){
            contents = contents + pileOfBooks.get(i).getNameOfBooks() + ", ";
        }

        return contents;
    }
}

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