A brief discussion on several circular accesses to collection object list in Java _java

Several circular accesses to the collection object list in Java are summarized as follows

1 Classic for loop

public static void Main (string[] args) {    
        
  list<string> List = new ArrayList ();    
  List.add ("123");    
  List.add ("Java");    
  List.add ("Java ee");    
  System.out.println ("========= Classic for Loop =======");    
  for (int i=0; i<list.size (); i++) {    
  System.out.println (List.get (i));    
  }    

2 Enhanced for loop

public static void Main (string[] args) {    
        
  list<string> List = new ArrayList ();    
  List.add ("123");    
  List.add ("Java");    
  List.add ("Java ee");    
  System.out.println ("=========java1.6 for Loop =======");    
  for (String s:list) {    
  System.out.println (s);    
  }    
}

3 Use of Iterate

public static void Main (string[] args) {    
        
  list<string> List = new ArrayList ();    
  List.add ("123");    
  List.add ("Java");    
  List.add ("Java ee");    
  System.out.println ("=========iterate cycle =======");    
  Iterator<string> iter = List.iterator ();    
  while (Iter.hasnext ()) {    
  System.out.println (Iter.next ());    
  }    
        
}

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