Java ListIterator Usage internStringsInList(List list)

Description

This method interns all the strings in the given list in place.

License

Apache License

Declaration

public static List<String> internStringsInList(List<String> list) 

Method Source Code

//package com.java2s;
/*/*from www  .  ja  v a 2 s .c  o  m*/
 * 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.List;
import java.util.ListIterator;

public class Main {
    /**
     * This method interns all the strings in the given list in place. That is,
     * it iterates over the list, replaces each element with the interned copy
     * and eventually returns the same list.
     *
     * Note that the provided List implementation should return an iterator
     * (via list.listIterator()) method, and that iterator should implement
     * the set(Object) method. That's what all List implementations in the JDK
     * provide. However, if some custom List implementation doesn't have this
     * functionality, this method will return without interning its elements.
     */
    public static List<String> internStringsInList(List<String> list) {
        if (list != null) {
            try {
                ListIterator<String> it = list.listIterator();
                while (it.hasNext()) {
                    it.set(it.next().intern());
                }
            } catch (UnsupportedOperationException e) {
            } // set() not implemented - ignore
        }
        return list;
    }
}

Related

1. gotoIndex(ListIterator iterator, int index)
2. incrementalComponentWiseAverageArbitraryDepth(Object average, int n, Object newItems)
3. indexOf(List list, E object)
4. insertBefore(List list, E... elements)
5. intern(ListIterator in)
6. isEqual(java.util.List list1, java.util.List list2)
7. iteratorBinarySearchGet(ListIterator i, int index)
8. lastIndexOf(List list, T element)
9. listEquals(List left, List right)