Returns a Collection containing a - b. - Android java.util

Android examples for java.util:Collection Filter

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Description

Returns a Collection containing a - b.

Demo Code

/*//from ww w  .  java2s . co m
 * Copyright 1999-2004 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.
 */
//package com.java2s;
import java.util.ArrayList;
import java.util.Collection;

import java.util.Iterator;

public class Main {
    /**
     * Returns a {@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.
     *
     * @see Collection#removeAll
     */
    public static Collection subtract(final Collection a, final Collection b) {
        ArrayList list = new ArrayList(a);
        Iterator it = b.iterator();
        while (it.hasNext()) {
            list.remove(it.next());
        }
        return list;
    }
}

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