Library

import java.util.ArrayList;

public class Library {

    private ArrayList<Book> newBookedd = new ArrayList<Book>();

    public Library() {

    }

    public void addBook(Book newBook) {

          this.newBookedd.add(newBook);

    }

    public void printBooks() {

        for (Book i : this.newBookedd) {
            System.out.println(i);
        }

    }

    public ArrayList<Book> searchByTitle(String title) {
        ArrayList<Book> found = new ArrayList<Book>();

        for (Book i : this.newBookedd) {
            if (this.newBookedd.contains(title)) {
                //  System.out.println(i);
                found.add(i);

            } else {
                //do nothing
            }

        }
        System.out.println(found);
        return found;
    }

    public ArrayList<Book> searchByPublisher(String publisher) {
        ArrayList<Book> found = new ArrayList<Book>();

        for (Book i : this.newBookedd) {
            if (this.newBookedd.contains(publisher)) {
                found.add(i);
            }
        }
        return found;
    }

    public ArrayList<Book> searchByYear(int year) {

        ArrayList<Book> found = new ArrayList<Book>();

        for (Book i : this.newBookedd) {
            if (this.newBookedd.contains(year)) {
                found.add(i);
            }
        }
        return found;

    }

}