Java Collection Subtract subtract(final Collection a, final Collection b)

Description

Returns a new Collection containing a - b.

License

Apache License

Parameter

Parameter	Description
a	the collection to subtract from, must not be null
b	the collection to subtract, must not be null

Return

a new collection with the results

Declaration

public static Collection subtract(final Collection a, final Collection b) 

Method Source Code

//package com.java2s;
/*//  w w w .  j a va  2  s .  c om
 *  Copyright 2001-2005 The Apache Software Foundation
 *
 *  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.ArrayList;
import java.util.Collection;

import java.util.Iterator;

public class Main {
    /**
     * Returns a new {@link Collection} containing <tt><i>a</i> - <i>b</i></tt>.
     * The cardinality of each element <i>e</i> in the returned {@link Collection}
     * will be the cardinality of <i>e</i> in <i>a</i> minus the cardinality
     * of <i>e</i> in <i>b</i>, or zero, whichever is greater.
     *
     * @param a  the collection to subtract from, must not be null
     * @param b  the collection to subtract, must not be null
     * @return a new collection with the results
     * @see Collection#removeAll
     */
    public static Collection subtract(final Collection a, final Collection b) {
        ArrayList list = new ArrayList(a);
        for (Iterator it = b.iterator(); it.hasNext();) {
            list.remove(it.next());
        }
        return list;
    }
}

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