Question

I have the following code sample, im pretty sure the first block should be placed in the main(), but where do I place the second block to make this Iterator example work?

List<String> myList= new ArrayList<String> ( );

Where do i place this? Would I need to create a second class?

static void printAll(ArrayList myList)
{
    Iterator it = myList.iterator();
}

then there’s this typical iterator pattern….is this in any way related to the second code block?

static void printAll(ArrayList myList)
{
    Iterator it = myList.iterator();
    Object temp;
    while( it.hasNext() )
    {
        temp = it.next();
        System.out.println( temp );
    }
    return;
}

Answer 1

It isn’t clear what you want to achieve, if you are asking how to pass your ArrayList (local variable in main) to the printAll method, do something like below:

public class XYZ {
  static void printAll(ArrayList myList)
  {
    Iterator it = myList.iterator();
    Object temp;
    while(it.hasNext() )
    {
      temp = it.next();
      System.out.println( temp );
    }
    return;
  }

  public static void main(String...args){

    List<String> myList= new ArrayList<String> ( );
    myList.add("Hello");
    myList.add("World");
    printAll(myList);//passing myList to printAll
  }
}