Java Collection First getFirstElement(Collection collection, T defaultValue)

Description

get First Element

License

Apache License

Declaration

public static <T> T getFirstElement(Collection<T> collection, T defaultValue) 

Method Source Code

//package com.java2s;
/*//from   ww  w.j a  v  a  2 s. c om
 * Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
 * Copyright [2016-2018] EMBL-European Bioinformatics Institute
 * 
 * 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.List;

public class Main {
    public static <T> T getFirstElement(Collection<T> collection, T defaultValue) {
        T elem = defaultValue;
        if (collection != null && !collection.isEmpty()) {
            if (List.class.isAssignableFrom(collection.getClass())) {
                elem = ((List<T>) collection).get(0);
            } else {
                for (T item : collection) {
                    elem = item;
                    break;
                }
            }
        }
        return elem;
    }
}

Related

1. getFirst(Collection ts)
2. getFirst(final Collection collection)
3. getFirstAndOnly(Collection c)
4. getFirstClassOfType(Collection l, Class type)
5. getFirstElement(Collection coll)
6. getFirstElementOrNull(Collection collection)
7. getFirstElementOrNull(Collection coll)
8. getFirstItem(Collection c)
9. getFirstItem(Collection collection)