Four ways to set up output in Java

There are four ways to collection output in Java, such as the following:

A) iterator output. This method applies to all subclasses of the collection.

 Public classhello{ Public Static voidMain (string[] args)throwsException {Set<Person> javaprogramers =NewHashset<person>(); Javaprogramers.add (NewPerson ("Aaron", 25)); Javaprogramers.add (NewPerson ("Larry", 32)); Javaprogramers.add (NewPerson ("Jesse", 33)); Javaprogramers.add (NewPerson ("Mike", 65)); Javaprogramers.add (NewPerson ("Jesse", 33)); Iterator<Person> iter =Javaprogramers.iterator ();  while(Iter.hasnext ()) {System.out.println (Iter.next ()); }    }}

Two) the foreach output. This method applies to all subclasses of the collection.

 Public classhello{ Public Static voidMain (string[] args)throwsException {Set<Person> javaprogramers =NewHashset<person>(); Javaprogramers.add (NewPerson ("Aaron", 25)); Javaprogramers.add (NewPerson ("Larry", 32)); Javaprogramers.add (NewPerson ("Jesse", 33)); Javaprogramers.add (NewPerson ("Mike", 65)); Javaprogramers.add (NewPerson ("Jesse", 33));  for(person item:javaprogramers) {System.out.println (item); }    }}

III) Listiterator. Applies only to subclasses of the list interface.

 Public classhello{ Public Static voidMain (string[] args)throwsException {List<Person> javaprogramers =NewArraylist<person>(); Javaprogramers.add (NewPerson ("Aaron", 25)); Javaprogramers.add (NewPerson ("Larry", 32)); Javaprogramers.add (NewPerson ("Jesse", 33)); Javaprogramers.add (NewPerson ("Mike", 65)); Javaprogramers.add (NewPerson ("Jesse", 33)); Listiterator<Person> iter =Javaprogramers.listiterator (); System.out.println ("Positive sequence output:");  while(Iter.hasnext ()) {System.out.println (Iter.next ()); } System.out.println ("Reverse-order output:");  while(Iter.hasprevious ()) {System.out.println (iter.previous ()); }    }}

Four) enumeration output. Applies only to vector classes.

 Public classhello{ Public Static voidMain (string[] args)throwsException {Vector<Person> javaprogramers =NewVector<person>(); Javaprogramers.add (NewPerson ("Aaron", 25)); Javaprogramers.add (NewPerson ("Larry", 32)); Javaprogramers.add (NewPerson ("Jesse", 33)); Javaprogramers.add (NewPerson ("Mike", 65)); Javaprogramers.add (NewPerson ("Jesse", 33)); Enumeration<Person> enumeration =javaprogramers.elements ();  while(Enumeration.hasmoreelements ()) {System.out.println (enumeration.nextelement ()); }    }}

Four ways to set up output in Java