Java Iterable First first(Iterable iterable)

Description

first

License

Apache License

Declaration

public static <T> T first(Iterable<T> iterable) 

Method Source Code

//package com.java2s;
/**//from  ww  w.j a  v a2 s  .  c om
 * Copyright (C) 2010-16 the original author or authors.
 *
 * 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.Iterator;

public class Main {
    public static <T> T first(Iterable<T> iterable) {
        return first(iterable.iterator(), null);
    }

    public static <T> T first(Iterator<T> iterator) {
        return first(iterator, null);
    }

    public static <T> T first(Iterable<T> iterable, T defaultValue) {
        return first(iterable.iterator(), defaultValue);
    }

    public static <T> T first(Iterator<T> iter, T defaultValue) {
        if (iter.hasNext()) {
            return iter.next();
        } else {
            return defaultValue;
        }
    }
}

Related

1. equal(Iterable first, Iterable second)
2. first(final Iterable iterable)
3. first(final Iterable iter)
4. first(Iterable iterable)
5. first(Iterable i)
6. first(Iterable iterable)
7. firstElement(Iterable iterable)
8. firstElementOrNull(Iterable iterable)
9. firstOf(final Iterable iterable)