Java Collection First firstValue(Class<T> type, Collection<?> values)

Description

first Value

License

Open Source License

Parameter

Parameter	Description
T	a parameter
type	a parameter
values	a parameter

Declaration

public final static <T> T firstValue(Class<T> type, Collection<?> values)

Method Source Code

//package com.java2s;
/*/*from  w ww .  j  ava2 s  . c o m*/
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright (c) 2013-2020 Madz. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License"). You
 * may not use this file except in compliance with the License. You can
 * obtain a copy of the License at
 * https://raw.github.com/zhongdj/Lifecycle/master/License.txt
 * . See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 * 
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 * 
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license." If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above. However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

import java.util.Collection;

public class Main {
    /**
     * @param <T>
     * @param type
     * @param values
     * @return
     */
    public final static <T> T firstValue(Class<T> type, Collection<?> values) {
        final T value = findFirstValue(type, values);
        if (null != value) {
            return value;
        }
        throw new IllegalStateException("Expecting at least one value");
    }

    /**
     * @param <T>
     * @param type
     * @param values
     * @return
     */
    public final static <T> T findFirstValue(Class<T> type, Collection<?> values) {
        if (null != values) {
            for (Object value : values) {
                if (type.isInstance(value)) {
                    return type.cast(value);
                }
            }
        }
        return null;
    }
}

Java Collection First firstValue(Class type, Collection values)

Description

License

Parameter

Declaration

Method Source Code

Related