Java tutorial
//package com.java2s; /* * Mojito Distributed Hash Table (Mojito DHT) * Copyright (C) 2006-2007 LimeWire LLC * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ import java.util.Collection; import java.util.Iterator; import java.util.NoSuchElementException; public class Main { /** * Returns the given Collection as formatted String */ public static String toString(Collection<?> c) { StringBuilder buffer = new StringBuilder(); Iterator it = c.iterator(); for (int i = 0; it.hasNext(); i++) { buffer.append(i).append(": ").append(it.next()).append('\n'); } // Delete the last \n if (buffer.length() > 1) { buffer.setLength(buffer.length() - 1); } return buffer.toString(); } /** * Returns an iterator that returns up to max number of elements from the * Collection */ private static <T> Iterator<T> iterator(final Collection<T> c, final int count) { return new Iterator<T>() { private final Iterator<T> it = c.iterator(); private int item = 0; public boolean hasNext() { if (item >= count) { return false; } return it.hasNext(); } public T next() { if (!hasNext()) { throw new NoSuchElementException(); } item++; return it.next(); } public void remove() { it.remove(); item--; } }; } }