Java search list of objects for variable

Question

I have a List of Book

List<Book> books = new ArrayList<Book>();

public class Book {
    String name;
    List<Author> authors;
}

Book contains a List of Author which contains an ID, Name and Age

public class Author {
    int ID;
    String Name;
    int Age;
}

I can iterate through the books List and return the Book where Name = x but I'm not sure how I can search Author and return where Name = y.

Answer 1

Add a method hasAuthor(String) to your Book which loops through the List<Author> list and compares the name. Like so:

boolean hasAuthor(String name) {
    for (Author author : authors) {
        if (author.name.equals(name)) {
            return true;
        }
    }
    return false;
}

To find books with a specific author, you loop over the List<Book> and invoke the hasAuthor(String) method.