Java List First Item firstValue(List list)

Description

Returns the first value of a list, or null if the list is empty.

License

Apache License

Parameter

Parameter	Description
T	List type
list	Input list

Return

First value or null

Declaration

public static <T> T firstValue(List<T> list) 

Method Source Code

//package com.java2s;
/* //from   ww w .ja v  a2s . c om
 * Copyright 2015 Eduardo Ramos.
 *
 * 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.List;

public class Main {
    /**
     * Returns the first value of a list, or null if the list is empty.
     *
     * @param <T> List type
     * @param list Input list
     * @return First value or null
     */
    public static <T> T firstValue(List<T> list) {
        if (list != null && !list.isEmpty()) {
            return list.get(0);
        }
        return null;
    }
}

Related

1. firstMatch(List src, String... lookup)
2. firstObjectFromList(List list)
3. firstOrDefault(List items)
4. firstStartsWith(List lines, String startsWith)
5. firstUnique(List list)
6. formatEJBQLObjectRangeRestriction(final String fieldName, final Object value1, final Object value2, final String paramName1, final String paramName2, List paramsName, List