Java Collection First first(Collection collection)

Description

first

License

Open Source License

Declaration

public static <T> T first(Collection collection) 

Method Source Code

//package com.java2s;
/*/*  w w w. j a v a 2  s .c  om*/
 * Copyright (c) 2013 GigaSpaces Technologies Ltd. All rights reserved
 *
 * 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 {
    public static <T> T first(Collection collection) {
        if (size(collection) > 0) {
            return (T) collection.iterator().next();
        }
        return null;
    }

    public static int size(Object[] vals) {
        return vals == null ? 0 : vals.length;
    }

    public static int size(Collection c) {
        return c == null ? 0 : c.size();
    }
}

Related

1. first(Collection collection)
2. first(Collection items)
3. first(Collection collection, E alternative)
4. first(Collection collection)
5. first(Collection collection)