move element in a list from one index to another index - Java java.util

Java examples for java.util:List Element

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Description

move element in a list from one index to another index

Demo Code

/*//from  ww  w.  j  av  a2  s .com
 * Copyright (c) 2012, Mayocat <hello@mayocat.org>
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
//package com.java2s;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] argv) {
        List collection = java.util.Arrays.asList("asdf", "java2s.com");
        int indexToMoveFrom = 42;
        int indexToMoveAt = 42;
        move(collection, indexToMoveFrom, indexToMoveAt);
    }

    public static void move(List<?> collection, int indexToMoveFrom,
            int indexToMoveAt) {
        if (indexToMoveAt >= indexToMoveFrom) {
            Collections.rotate(
                    collection.subList(indexToMoveFrom, indexToMoveAt + 1),
                    -1);
        } else {
            Collections.rotate(
                    collection.subList(indexToMoveAt, indexToMoveFrom + 1),
                    1);
        }
    }
}

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