How do forach iterations work in Java?

for(Iterator<String> i = someList.iterator(); i.hasNext(); ) {
    String item = i.next();
    System.out.println(item);
}

If you use i.remove(); in a repeating statement or if you want to access the actual iterator, you cannot use the for(:) command statement.

This source code is operational for any object that implements Iterable interface.

Also, if the right input in the for(:) statement is array instead of Itaerable object, the internal source code uses an int-type index counter to check array.length. Check out Java spec.