Java Iterator Size size(final Iterator iter)

Description

Returns the number of elements in the iterator sequence.

License

Apache License

Parameter

Parameter	Description
E	the element type
iter	the iterator

Return

the number of elements

Declaration

public static <E> int size(final Iterator<E> iter) 

Method Source Code

//package com.java2s;
/**/*from www.ja va  2s.co  m*/
 * Licensed to the TomTom International B.V. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  TomTom International B.V.
 * licenses this file to you 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.Iterator;

public class Main {
    /**
     * Returns the number of elements in the iterator sequence.
     * 
     * The iterator cannot be re-used after calling this function!!
     *
     * @param <E> the element type
     * @param iter the iterator
     * @return the number of elements
     */
    public static <E> int size(final Iterator<E> iter) {
        if (iter == null) {
            throw new NullPointerException();
        }
        int count = 0;
        while (iter.hasNext()) {
            iter.next();
            count++;
        }
        return count;
    }
}

Related

1. count(final Iterator iterator)
2. count(Iterator triples)
3. count(Iterator iterator)
4. count(Iterator it)
5. counter(final Iterator iterator)
6. size(Iterator source)
7. size(Iterator iterator)
8. size(Iterator iterator)