what is the difference between executing For loop Java -

could tell me, difference between loop java in code , b? while both of them gives same result in executing? , know doing, why loop written way in code *a* thanks

the code

//code public class myarray {   public static void main (string[] args){    int[] ={1,10,30,40,50};    (int : a)   {       system.out.println(i);   }   } } //==================================== //code b  public class myarray{   public static void main (string[] args){    int[] ={1,10,30,40,50};    (int i=0;i< a.length; i++)   {       system.out.println(a[i]);   }   } } 

iterating on collection uglier needs be. consider following method, takes collection of timer tasks , cancels them:

void cancelall(collection<timertask> c) {     (iterator<timertask> = c.iterator(); i.hasnext(); )         i.next().cancel(); } 

the iterator clutter. furthermore, opportunity error. iterator variable occurs 3 times in each loop: 2 chances wrong. for-each construct gets rid of clutter , opportunity error. here how example looks for-each construct:

void cancelall(collection<timertask> c) {     (timertask t : c)         t.cancel(); } 

for each better way of iterating.

limitation: in for-each loop not able know number of element(index of element in collection) processing, need define counter same, while in simple loop i tells number of element processing.