Java tutorial
//package com.java2s; /* Copyright (C) 2013 Raquel Pau and Albert Coroleu. Walkmod is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Walkmod 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with Walkmod. If not, see <http://www.gnu.org/licenses/>.*/ import java.util.Collection; import java.util.Comparator; import java.util.Iterator; public class Main { public static Object findObject(Collection<?> c, Object o, Comparator cmp) { if (c != null && o != null && cmp != null) { Iterator<?> it = c.iterator(); while (it.hasNext()) { Object current = it.next(); if (o.getClass().equals(current.getClass())) { if (cmp.compare(current, o) == 0) { return current; } } } } return null; } }