Java Iterable Size size(Iterable values)

Description

Returns the number of elements in the Iterable .

License

Apache License

Declaration

public static int size(Iterable<?> values) 

Method Source Code

//package com.java2s;
/*/* w ww . j  a va2  s.c om*/
 * Copyright 2010-2012 Roger Kapsi
 *
 *   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.Collection;

import java.util.Iterator;

public class Main {
    /**
     * Returns the number of elements in the {@link Iterable}.
     */
    public static int size(Iterable<?> values) {
        if (values instanceof Collection<?>) {
            return ((Collection<?>) values).size();
        }

        int count = 0;
        for (Iterator<?> it = values.iterator(); it.hasNext(); ++count) {
            it.next();
        }
        return count;
    }
}

Related

1. singleOrNull(Iterable iterable)
2. size(final Iterable iterable)
3. size(final Iterable iterable)
4. size(Iterable it)
5. size(Iterable iterable)
6. sizeEquals(Iterable iterable, int expectedSize)