hii all,
can anybody explain enhance for loop(jdk1.5) with an example .
Thanks

in java1.4 version, for retriving data in collections we use while loop as

//Iterator itr=component.iterator();
while(itr.next())

but not for loop because it takes 3 steps for execution as

for(initalitation/*step1*/;condition/*step2*/;iteration/*step3*/)

for this drawback, jdk1.5 introduced enhance for loop as shown below
for(condition)
{
//staement
}
But i can't know how to use this for loop

Hi,

Enhance for loop is given below...........

Consider the following method, which takes a collection of timer tasks and cancels them:

void cancelAll(Collection<TimerTask> c) {
for (Iterator<TimerTask> i = c.iterator(); i.hasNext(); )
i.next().cancel();
}


The iterator is just clutter. Furthermore, it is an opportunity for error. The iterator variable occurs three times in each loop: that is two chances to get it wrong.

The for-each construct gets rid of the clutter and the opportunity for error. Here is how the example looks with the for-each construct:

void cancelAll(Collection<TimerTask> c) {
for (TimerTask t : c)
t.cancel();
}

The for-each construct is also applicable to arrays, where it hides the index variable rather than the iterator


Thanks,
Riju