Java™ Application Development on Linux - Dator

3.2 Fundamental Language Elements71The purpose of an iterator, then, is to step through a collection one itemat a time. Example 3.14 shows a collection being built from the arguments onthe command line. Then two iterators are used to step through the collectionExample 3.14 Using iteratorsimport java.util.*;public classIter8{public static voidmain(String [] args){// create a new (empty) ArrayListArrayList al = new ArrayList();// fill the ArrayList with argsfor(int i = 0; i < args.length; i++) {al.add(args[i]);}// use the iterator in the while loopIterator itr1 = al.iterator();while(itr1.hasNext()) {String onearg;onearg = (String) (itr1.next());System.out.println("arg=" + onearg);}// define and use the iterator in the for loop:for(Iterator itr2 = al.iterator(); itr2.hasNext(); ) {String onearg;onearg = (String) (itr2.next());System.out.println("arg=" + onearg);}} // main} // Iter8remove() method, something that Enumeration doesn’t support. The Enumeration classis still around, but less frequently used. It is only available from certain older utility classes.