Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * #%L
 * UCoin Java :: Core Shared
 * %%
 * Copyright (C) 2014 - 2016 EIS
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import java.util.Collection;

public class Main {
    public static <E> E extractSingleton(Collection<E> collection) {
        if (collection != null && collection.size() == 1) {
            return collection.iterator().next();
        } else {
            throw new IllegalArgumentException("Can extract singleton only when collection size == 1");
        }
    }

    public static int size(final Collection<?> collection) {
        return collection == null ? 0 : collection.size();
    }

    public static int size(final Object[] array) {
        return array == null ? 0 : array.length;
    }
}