Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010 BSI Business Systems Integration AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/

import java.util.ArrayList;

import java.util.Collection;

public class Main {
    /**
     * Null safe creation of a {@link ArrayList} out of a given collection. The returned {@link ArrayList} is modifiable.
     * The result list is never null and does not contain any null elements.
     *
     * @param c
     * @return an {@link ArrayList} containing the given collection's elements. Never null
     */
    public static <T> ArrayList<T> arrayListWithoutNullElements(Collection<? extends T> c) {
        if (c != null) {
            ArrayList<T> list = new ArrayList<T>(c.size());
            for (T o : c) {
                if (o != null) {
                    list.add(o);
                }
            }
            return list;
        }
        return emptyArrayList();
    }

    public static <T> int size(Collection<T> list) {
        if (list == null) {
            return 0;
        }
        return list.size();
    }

    /**
     * Returns a new empty {@link ArrayList}.<br>
     * This method differs to {@link Collections#emptyList()} in that way that the {@link ArrayList} returned by this
     * method can be modified hence is no shared instance.
     *
     * @return An empty but modifiable {@link ArrayList} with an initial capacity of <code>0</code>.
     */
    public static <T> ArrayList<T> emptyArrayList() {
        return new ArrayList<T>(0);
    }
}