Here you can find the source of intersectSorted(final Collection extends T> c1, final Collection extends T> c2)
public static <T extends Comparable<T>> SortedSet<T> intersectSorted(final Collection<? extends T> c1, final Collection<? extends T> c2)
//package com.java2s; /* *********************************************************************** * * project: org.matsim.*//from w ww. jav a2 s .c o m * CollectionUtils.java * * * *********************************************************************** * * * * copyright : (C) 2013 by the members listed in the COPYING, * * LICENSE and WARRANTY file. * * email : info at matsim dot org * * * * *********************************************************************** * * * * 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. * * See also COPYING, LICENSE and WARRANTY file * * * * *********************************************************************** */ import java.util.Collection; import java.util.SortedSet; import java.util.TreeSet; public class Main { public static <T extends Comparable<T>> SortedSet<T> intersectSorted(final Collection<? extends T> c1, final Collection<? extends T> c2) { final SortedSet<T> set = new TreeSet<T>(); for (T t : c1) { if (c2.contains(t)) set.add(t); } return set; } }