Java Collection First getFirstClassOfType(Collection l, Class type)

License

Declaration

public static <T, U> U getFirstClassOfType(Collection<T> l, Class<U> type) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * The MIT License (MIT)/* w  ww  .  ja v a2s  .c o m*/
 * Copyright (c) 2015 University of Twente
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *******************************************************************************/

import java.util.Collection;

public class Main {
    /**
     * Get the first class of type U in the collection
     */
    public static <T, U> U getFirstClassOfType(Collection<T> l, Class<U> type) {
        for (T o : l) {
            if (type.isInstance(o)) {
                return type.cast(o);
            }
        }
        return null;
    }
}

Related

1. getFirst(Collection set)
2. getFirst(Collection set, boolean remove)
3. getFirst(Collection ts)
4. getFirst(final Collection collection)
5. getFirstAndOnly(Collection c)
6. getFirstElement(Collection coll)
7. getFirstElement(Collection collection, T defaultValue)
8. getFirstElementOrNull(Collection collection)
9. getFirstElementOrNull(Collection coll)