Java Iterator implementation causing compile errors

Question

I'm unsure how to add Iterator code to my DLL class

i tried two approaches but i get compile errors in both cases:

public static void main(String[] args)
{
    DLL myList = new DLL() ;

...

public java.util.Iterator iterator()
(
    return new LRIterator() ;
)

private class LRIterator implements Iterator
{
 ...
}
...

compile error: ';' expected public java.util.Iterator iterator();

other approach:

public static void main(String[] args)
{
    DLL myList = new DLL() ;
    ...
    Iterator itr = myList.iterator(); 
    while(itr.hasNext()) {

    Object element = itr.next(); 
    System.out.print(element + " ");
}
...

copile error: cannot find symbol Iterator = myList.iterator();

aioobe · Accepted Answer · 2011-03-24 19:46:55Z

5

You may want to change ( and ) into { and } in the following snippet:

public java.util.Iterator iterator()
(
    return new LRIterator() ;
)

A few extra pointers.

I suggest you don't use the raw type of Iterator and instead use Iterator<T> if your list contains elements of type T.
I suggest you let your class which has the iterator() method implement the Iterable<T> interface. This allows users of your class to use it in for each loops for instance.

edited Mar 24, 2011 at 19:46

answered Mar 24, 2011 at 19:41

aioobe

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1 Comment

user425727 Over a year ago

Deuh! I'm sorry for asking the question now... Thanks for the additional tips! – getting a new error: LRIterator is not abstract and does not override abstract method remove()...any idea?

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