Removes duplicate objects from the Collection. - Java java.util

Java examples for java.util:Collection Element Remove

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Description

Removes duplicate objects from the Collection.

Demo Code

/**/*from   w  w  w. j a  va  2s.c  om*/
 *  Copyright 2009 Welocalize, Inc. 
 *  
 *  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.
 *  
 */
//package com.java2s;
import java.util.Collection;
import java.util.Iterator;
import java.util.HashSet;

public class Main {
    public static void main(String[] argv) {
        Collection p_collection = java.util.Arrays.asList("asdf",
                "java2s.com");
        System.out.println(removeDuplicates(p_collection));
    }

    /**
     * Removes duplicate objects from the Collection.
     * @param p_collection a Collection
     * @returns true if one or more duplicate objects were removed.
     */
    public static boolean removeDuplicates(Collection p_collection) {
        if (p_collection == null) {
            return false;
        }
        HashSet set = new HashSet(p_collection.size());
        Iterator it = p_collection.iterator();
        while (it.hasNext()) {
            set.add(it.next());
        }
        if (set.size() != p_collection.size()) {
            p_collection.clear();
            p_collection.addAll(set);
            return true;
        }
        return false;
    }
}

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