Iterator

/*
Programmer: Mary Rose M. Celmar
Date Started: 03-04-09
Date Ended: 03-04-09
Purpose: to learn about iterator
*/

class WithData{

private Treeset<>m_data=new Treeset();

 public void add(int in)
 {
 m_data.add(in);
 }

 public Collection get_data()
 {
 return m_data;
 }
}


class Demo{

public static void main (String [] args){

 WithData some_object=new WithData ();
 for (int i=9;i>0;--1)
 some_object.add(i);
 Collection data =some_object.get_data();

 for (java.util.Iterator it=data.iterator();it.hasNext();)
  System.out.print(it.next() + " ");
 
}
}

output:

1 2 3 4 5 6 7 8 9


I Learned about:

* three methods of iterator which is optional. The it.hasNext(), it.next(), and it.remove().
* Iterator are created by calling the iterator() or listIterator() method.
* listIterator Methods . the it.hasPrevious(), it.previous(),itnextIndex(), it.previousIndex(), it.add(obj), it.set(),and it.remove()