Java Collection Search hasOneItem(final Collection col)

Description

has One Item

License

Apache License

Return

true if collection has only 1 item (null safe).

Declaration

public static boolean hasOneItem(final Collection<?> col) 

Method Source Code

//package com.java2s;
/*/*from   ww w  .j  a v  a 2 s. c  o m*/
 * ObjectLab, http://www.objectlab.co.uk/open is sponsoring the ObjectLab Kit.
 *
 * Based in London, we are world leaders in the design and development
 * of bespoke applications for the securities financing markets.
 *
 * <a href="http://www.objectlab.co.uk/open">Click here to learn more</a>
 *           ___  _     _           _   _          _
 *          / _ \| |__ (_) ___  ___| |_| |    __ _| |__
 *         | | | | '_ \| |/ _ \/ __| __| |   / _` | '_ \
 *         | |_| | |_) | |  __/ (__| |_| |__| (_| | |_) |
 *          \___/|_.__// |\___|\___|\__|_____\__,_|_.__/
 *                   |__/
 *
 *                     www.ObjectLab.co.uk
 *
 * $Id: AbstractDateCalculator.java 309 2010-03-23 21:01:49Z marchy $
 *
 * Copyright 2006 the original author or authors.
 *
 * 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;

public class Main {
    /**
     * @return true if collection has only 1 item (null safe).
     */
    public static boolean hasOneItem(final Collection<?> col) {
        return col != null && col.size() == 1;
    }

    /**
     * @return size of collection if not null, otherwise 0.
     */
    public static int size(final Collection<?> col) {
        return col != null ? col.size() : 0;
    }
}

Related

1. hasElements(Collection collection)
2. hasElements(Collection t)
3. hashCapacityFor(Collection collection)
4. hasLength(final Collection collection)
5. hasNoValue(Collection collection)
6. hasOtherThan(Collection a, Collection b)
7. hasValidElement(Collection collection)
8. hasValue(Collection collection)
9. indexOf(Collection stringCollection, String str)