I have created an array (tab[]) of objects and now I need to filter and print via one of their fields (ex. print if ob.a>1 ). I created an Iterator interface, ArrayIterator that goes through all entries on list and Predicate interface. This is constructor of my FilteringIterator:

private final Iterator iterf;
private final Predicate pred; 
public FilteringIterator(ArrayIterator i, Predicate predykat) 
{ 
    iterf=i;
    pred=predykat;
    iterf.first();
} 

Method that prints every entry using my "basic" iterator looks like this:

  public void printlist()
{
    ArrayIterator itab =new ArrayIterator(lista);
    for(itab.first();!itab.isDone(); itab.next())
    {
        Student stud=(Student)itab.current();
        stud.show();
    }
}

I also have a class that implements Predicate interface:

public interface Predicate

 {
      public boolean accept(Object ob); 
 }

How to use my FilteringIterator, when it requires Predicate, and I cannot create such object, as it's an interface?