Hi folks,
Hope this helps :)
Defined with a example .....
package com.help.pack;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
public class CollectionsExample {
public static void main(String args[]) {
List<String> strlist = new ArrayList<String>();
strlist.add("Ashok");
strlist.add("JKid");
strlist.add("Elvis");
filter(strlist);//filter criteria defined in here
System.out.println("The final list after filtering");
System.out.println(strlist);
}
static void filter(Collection<String> c) {
for (Iterator<String> it = c.iterator(); it.hasNext();) //Use
the iterator
if (!cond(it.next()))
it.remove();
}
static boolean cond(String strfrmcoll) {
boolean condition = true;
if (strfrmcoll.equals("Ashok")) { //Remove Ashok from the list
condition = false;
}
return condition;
}
}
Thanks and Cheers,
Ashok A V
On Tue, Aug 4, 2009 at 12:55 AM, miga<migat...@gmail.com> wrote:
>
>
>
> On Aug 3, 7:50 pm, JKid314159 <happy27...@yahoo.com> wrote:
>> Re: The Java Tutorials
>> Home Page>Collections?Interfaces>The Collection Interface
>>
>> Dear Java Programmer:
>>
>> I am not too sure how this condition works? Looks simple but I have a block
>> on it.
>>
>> if (!cond(it.next()))
>> it.remove();
>>
> Actually the whole code would be:
>
> static void filter(Collection<?> c) {
> for (Iterator<?> it = c.iterator(); it.hasNext(); )
> if (!cond(it.next()))
> it.remove();
> }
>
> (from
> http://java.sun.com/docs/books/tutorial/collections/interfaces/collection.html)
>
> So, say you want to get a sub-collection of a collection whose
> elements respond to given condition; to do it, you define a filter on
> the collection to isolate the elements which responds to the
> condition, or to say it more accurately you write a method which
> iterates over the collection, and inside this iteration locates the
> last element which violates the condition, if it does so you remove
> it.
>
> All that, because remove operates on the current element and an
> iterator gives a position between two elements, so that it.next gives
> you the current element to remove if it violates the condition.
>
> See http://java.sun.com/javase/6/docs/api/java/util/ListIterator.html
> for a graphic on cursor position.
>> JKid314159http://existentialists.blogspot.com/
>>
>>
>>
> >
>
--
Victory belongs to the most persevering.
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