Java List Reverse reverse(List list)

Description

Reverse a list.

License

Apache License

Parameter

Parameter	Description
list	The list to reverse.

Declaration

public static void reverse(List<?> list) 

Method Source Code

//package com.java2s;
/*/*from w ww .  j a  v a2  s. c o  m*/
 * Copyright JTheque (Baptiste Wicht)
 *
 * 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.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Map;
import java.util.Map.Entry;

public class Main {
    /**
     * Reverse the order of a map. This method provide correct result only for map who retain the insertion order.
     *
     * @param map The map to reverse.
     * @param <T> The Key type.
     * @param <K> The value type.
     */
    public static <T, K> void reverse(Map<T, K> map) {
        List<Entry<T, K>> entries = new ArrayList<Entry<T, K>>(map.entrySet());

        map.clear();

        for (int i = entries.size() - 1; i >= 0; i--) {
            Entry<T, K> entry = entries.get(i);

            map.put(entry.getKey(), entry.getValue());
        }
    }

    /**
     * Reverse a list.
     *
     * @param list The list to reverse.
     */
    public static void reverse(List<?> list) {
        Collections.reverse(list);
    }
}

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4. reverse(List aList)
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