clone all elements in Collection - Java java.util

Java examples for java.util:Collection Element

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Description

clone all elements in Collection

Demo Code

/*//from   w  ww .ja v  a 2  s.  co  m
 * 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.book2s;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class Main {
    public static void main(String[] argv) {
        Collection inputCollection = java.util.Arrays.asList("asdf",
                "book2s.com");
        System.out.println(cloneEx(inputCollection));
    }

    /**
     * clone all elements
     * 
     * @param inputCollection
     *            the collection to get the input from, may not be null
     * @return all elements (new list)
     * @throws NullPointerException
     *             if the input collection is null
     */
    public static <E> Collection<E> cloneEx(Collection<E> inputCollection) {
        final ArrayList<E> outputCollection = new ArrayList<E>(
                inputCollection.size());
        for (Iterator<E> iter = inputCollection.iterator(); iter.hasNext();) {
            outputCollection.add(iter.next());
        }
        return outputCollection;
    }
}

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