Java Iterable First first(Iterable i)

Description

first

License

Open Source License

Parameter

Parameter	Description
i	the Iterable whose first element is to be retrieved

Return

first element of iterable

Declaration

public static <E> E first(Iterable<E> i) 

Method Source Code

//package com.java2s;
/*/*from w w  w .  j ava2 s .  c  o  m*/
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2006, University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.util.Iterator;

public class Main {
    /**
     * @param i
     *            the Iterable whose first element is to be retrieved
     * @return first element of iterable
     */
    public static <E> E first(Iterable<E> i) {
        Iterator<E> iterator = i.iterator();
        if (!iterator.hasNext()) {
            throw new IllegalArgumentException("iterator has no elements");
        }
        return iterator.next();
    }
}

Related

1. equal(Iterable first, Iterable second)
2. first(final Iterable iterable)
3. first(final Iterable iter)
4. first(Iterable iterable)
5. first(Iterable iterable)
6. first(Iterable iterable)
7. firstElement(Iterable iterable)
8. firstElementOrNull(Iterable iterable)