Java tutorial
//package com.java2s; /* * Copyright 2004-2014 the Seasar Foundation and the Others. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific language * governing permissions and limitations under the License. */ import java.util.Collection; import java.util.Comparator; import java.util.SortedSet; import java.util.TreeSet; public class Main { public static <E> TreeSet<E> newTreeSet() { return new TreeSet<E>(); } public static <E> TreeSet<E> newTreeSet(final Collection<? extends E> c) { return new TreeSet<E>(c); } public static <E> TreeSet<E> newTreeSet(final Comparator<? super E> c) { return new TreeSet<E>(c); } public static <E> TreeSet<E> newTreeSet(final SortedSet<? extends E> s) { return new TreeSet<E>(s); } }