Returns the number of occurrences of obj in Collection. - Android java.util

Android examples for java.util:Collection Filter

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Description

Returns the number of occurrences of obj in Collection.

Demo Code

/*/* www.j a v  a2 s  .  c o  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.Collection;

import java.util.Iterator;

public class Main {
    /**
     * Returns the number of occurrences of <i>obj</i>
     * in <i>col</i>.
     */
    public static int cardinality(Object obj, final Collection col) {
        int count = 0;
        Iterator it = col.iterator();
        while (it.hasNext()) {
            Object elt = it.next();
            if ((null == obj && null == elt) || obj.equals(elt)) {
                count++;
            }
        }
        return count;
    }
}

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