move Item to new index in a List - Java java.util

Java examples for java.util:List Operation

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Description

move Item to new index in a List

Demo Code

/*//from w ww  . ja  v  a  2s .  c om
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.java2s;
import java.util.List;

public class Main {
    public static void main(String[] argv) {
        List list = java.util.Arrays.asList("asdf", "java2s.com");
        Object oldItem = "java2s.com";
        int newIndex = 42;
        moveItem(list, oldItem, newIndex);
    }

    public static void moveItem(List list, Object oldItem, int newIndex) {
        if ((list == null) || (list.isEmpty())) {
            return;
        }

        int index = list.indexOf(oldItem);
        if (index == -1) {
            return;
        }

        list.remove(index);
        list.add(newIndex, oldItem);
    }
}

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