Search functionality

    import java.util.ArrayList;

     public class Randomizing {
   public static void main(String[] args) {
    Library Library = new Library();

    Library.addBook(new Book("Cheese Problems Solved", "Woodhead Publishing", 2007));
    Library.addBook(new Book("The Stinky Cheese Man and Other Fairly Stupid Tales", "Penguin Group", 1992));
    Library.addBook(new Book("NHL Hockey", "Stanley Kupp", 1952));
    Library.addBook(new Book("Battle Axes", "Tom A. Hawk", 1851));

    ArrayList<Book> result = Library.searchByTitle("Cheese");
    for (Book book: result) {
        System.out.println(book);
    }

    System.out.println("---");
    for (Book book: Library.searchByPublisher("Penguin Group  ")) {
        System.out.println(book);
    }

    System.out.println("---");
    for (Book book: Library.searchByYear(1851)) {
        System.out.println(book);
    }



}
} 

public class Book {
private String title;
private String publisher;
private int year;

public Book(String title, String publisher, int year) {
    this.title = title;
    this.publisher = publisher;
    this.year = year;
}

public String title() {
    return this.title;
}

public String publisher() {
    return this.publisher;
}

public int year() {
    return this.year;
}

public String toString() {
    return this.title + ", " + this.publisher + ", " + this.year;
}
}

import java.util.ArrayList;

public class Library {
private ArrayList<Book> list;
public Library() {
    this.list = new ArrayList<Book>();
}

public void addBook(Book newBook) {
    list.add(newBook);
}

public void printBooks() {
    for(Book boo : this.list) {
        System.out.println(boo);
    }
}

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

    for(Book book : found) {
        if(book.title().contains(title)) {
            found.add(book);
        }
    }
    return found;
}

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

    for(Book book : found) {
        if(book.publisher().contains(publisher)) {
            found.add(book);
        }
    }
    return found;
}

public ArrayList<Book> searchByYear(int year) {
    ArrayList<Book> found = new ArrayList<Book>();

    for(Book book : found) {
        if(book.year() == year) {
            found.add(book);
        }
    }
    return found;
}
}