Hi! So it is saying, if not the condition there is a next element then do remove the current element.
Respects, JKid314159 http://existentialists.blogspot.com/ --- On Tue, 8/4/09, Ashok A V <ashok.f...@gmail.com> wrote: From: Ashok A V <ashok.f...@gmail.com> Subject: [java programming] Re: Lab1016 To: migat...@gmail.com, happy27...@yahoo.com Cc: javaprogrammingwithpassion@googlegroups.com Date: Tuesday, August 4, 2009, 3:08 AM 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. - Napoleon --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to javaprogrammingwithpassion@googlegroups.com To unsubscribe from this group, send email to javaprogrammingwithpassion-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/javaprogrammingwithpassion?hl=en -~----------~----~----~----~------~----~------~--~---
