Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2011 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.*;

public class Main {
    public static <E> List<E> compact(List<E> list) {
        boolean foundAtLeastOneNull = false;
        List<E> compacted = null;
        int i = 0;

        for (E element : list) {
            if (element == null) {
                if (!foundAtLeastOneNull) {
                    compacted = new ArrayList<E>(list.size());
                    if (i > 0) {
                        compacted.addAll(list.subList(0, i));
                    }
                }
                foundAtLeastOneNull = true;
            } else if (foundAtLeastOneNull) {
                compacted.add(element);
            }
            ++i;
        }

        return foundAtLeastOneNull ? compacted : list;
    }

    /**
     * Utility for adding an iterable to a collection.
     *
     * @param t1 The collection to add to
     * @param t2 The iterable to add each item of to the collection
     * @param <T> The element type of t1
     * @return t1
     */
    public static <T> Collection<T> addAll(Collection<T> t1, Iterable<? extends T> t2) {
        for (T t : t2) {
            t1.add(t);
        }
        return t1;
    }

    /**
     * Utility for adding an array to a collection.
     *
     * @param t1 The collection to add to
     * @param t2 The iterable to add each item of to the collection
     * @param <T> The element type of t1
     * @return t1
     */
    public static <T> Collection<T> addAll(Collection<T> t1, T... t2) {
        Collections.addAll(t1, t2);
        return t1;
    }
}