I have Book
and BookList
classes. BookList
is something like this:
public class BookList { private final List<Book> bList = new ArrayList<Book>(); public int size() { return bList.size(); } public boolean isEmpty() { ... } public boolean contains(Book b) { ... } public boolean add(Book b) { ... } public boolean remove(Book b) { .. } public void clear() { ... } public Book get(int index) { ... } }
In my main class I want to print titles of books with in a for each loop:
for(Book b : bList) { b.print(); }
Eclipse says:
Can only iterate over an array or an instance of java.lang.Iterable
How can I get this working?
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Answer
You need to implement the Iterable
interface, which means you need to implement the iterator()
method. In your case, this might look something like this:
public class BookList implements Iterable<Book> { private final List<Book> bList = new ArrayList<Book>(); @Override public Iterator<Book> iterator() { return bList.iterator(); } ... }