提供Set的浅表副本，其中省略了被移除的Collection所标识的那些元素。

/*

 * Copyright Terracotta, Inc.

 *

 * 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.

 */

//package com.nowjava;


import java.util.Collection;/* 来 自 时 代 J a v a 公 众 号 - nowjava.com*/


import java.util.LinkedHashMap;

import java.util.LinkedHashSet;


import java.util.Map;

import java.util.Set;


public class Main {

    /**

     * Makes a shallow copy of the {@code Set} provided omitting those elements identified by the

     * {@code Collection} {@code removed}.

     *

     * @param source the {@code Set} from which the copy is made

     * @param removed the elements to omit from the copy

     *

     * @return a new, entry-ordered {@code Set} containing the elements from {@code source} less those

     *    specified in {@code removed}

     */

    static Set<String> copyWithout(final Set<String> source,

            final Collection<String> removed) {

        final Set<String> copy = new LinkedHashSet<String>(source);

        copy.removeAll(removed);

        return copy;

    }

    /*
    时代Java公众号 提供
    */

    /**

     * Makes a shallow copy of the {@code Map} provided omitting those entries identified by the

     * keys in the {@code Collection} {@code removed}.

     *

     * @param source the {@code Map} from which the copy is made

     * @param removed the keys of the entries to omit from the copy

     *

     * @return a new, entry-ordered {@code Map} containing the entries from {@code source} less those

     *    specified in {@code removed}

     */

    static Map<String, String> copyWithout(