Java Collection First getFirst(Collection coll)

Description

INTERNAL: Gets the first object in the collection.

License

Apache License

Declaration

public static <T> T getFirst(Collection<T> coll) 

Method Source Code

//package com.java2s;
/*/*from w w w.  j a va  2  s .  c o  m*/
 * #!
 * Ontopia Engine
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * 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;
import java.util.List;

public class Main {
    /**
     * INTERNAL: Gets the first object in the collection. If the
     * collection is empty, null is returned.
     */
    public static <T> T getFirst(Collection<T> coll) {
        if (coll == null || coll.isEmpty())
            return null;

        // If it's a list return it directly
        if (coll instanceof List)
            return ((List<T>) coll).get(0);
        Iterator<T> iter = coll.iterator();
        while (iter.hasNext()) {
            return iter.next();
        }
        return null;
    }
}

Related

1. getFirst(Collection c)
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4. getFirst(Collection c)
5. getFirst(Collection col)
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7. getFirst(Collection collection)
8. getFirst(Collection collection)
9. getFirst(Collection collection)