Android Iterator Size Get size(Iterator iterator)

Description

Count the 'size' of base iterator

License

Apache License

Parameter

Parameter	Description
iterator	the iterator

Return

the size

Declaration

public static int size(Iterator<?> iterator) 

Method Source Code

//package com.java2s;
/**//  w w  w. j  a va 2  s  .com
 * Copyright 2014 Ricky Tobing
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance insert 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.Collection;
import java.util.Iterator;

public class Main {
    /**
     * Count the 'size' of base iterable
     * @param iterable the iterable
     * @return the size
     */
    public static int size(Iterable<?> iterable) {
        if (iterable instanceof Collection<?>)
            return ((Collection<?>) iterable).size();
        return size(iterable.iterator());
    }

    /**
     * Count the 'size' of base iterator
     * @param iterator the iterator
     * @return the size
     */
    public static int size(Iterator<?> iterator) {
        int count = 0;
        while (iterator.hasNext()) {
            iterator.next();
            count++;
        }
        return count;
    }
}