Java List First Item first(final List t)

Description

Returns first item in List .

License

Apache License

Parameter

Parameter	Description
T	type
t	T

Return

T

Declaration

public static <T> T first(final List<T> t) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  .  j  av a 2  s  . c o  m*/
 * Copyright (C) 2017 FormKiQ Inc.
 *
 * 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 first item in {@link List}.
     * @param <T> type
     * @param t T
     * @return T
     */
    public static <T> T first(final List<T> t) {
        return t != null && !t.isEmpty() ? t.get(0) : null;
    }

    /**
     * Get Value at Index or default value.
     * @param <T> T
     * @param list {@link List}
     * @param index int
     * @param defaultValue default value
     * @return T return value
     */
    public static <T> T get(final List<T> list, final int index, final T defaultValue) {

        try {
            return list.get(index);
        } catch (IndexOutOfBoundsException e) {
            return defaultValue;
        }
    }
}

Related

1. equalLists(List first, List second)
2. expectedOrder(List src, Object first, Object second)
3. extractFirst(int numberToExtract, List list)
4. first(final List list)
5. first(final List list, final int oridinal)
6. first(List list)
7. first(List l)
8. first(List l)
9. first(List list)