Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package twitter; import java.util.Comparator; import java.util.Iterator; import java.util.TreeSet; import twitter4j.Status; class MyComp implements Comparator<Status> { @Override public int compare(Status o1, Status o2) { Long i1 = o1.getCreatedAt().getTime(); Long i2 = o2.getCreatedAt().getTime(); return i2.compareTo(i1); } } /** * * @author Administrator */ public class TweetSet extends TreeSet<Status> { private final int _max; public TweetSet(int max) { super(new MyComp()); _max = max; } @Override public synchronized boolean add(Status e) { if (this.size() == _max) { if (e.getCreatedAt().getTime() > this.last().getCreatedAt().getTime()) { this.pollLast(); } else { return false; } } return super.add(e); } @Override public synchronized Iterator iterator() { return super.iterator(); } }