Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*****************************************************************************************
 * *** BEGIN LICENSE BLOCK *****
 *
 * Version: MPL 2.0
 *
 * echocat Jomon, Copyright (c) 2012-2014 echocat
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * *** END LICENSE BLOCK *****
 ****************************************************************************************/

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import java.util.*;

public class Main {
    /**
     * Returns a {@link LinkedHashMap}
     * with the mappings <code>a[0] => a[1], a[2] => a[3], ...</code>.
     * @param a the elements to construct a {@link Map} from.
     * @return a {@link Map} constructed of the specified elements.
     */
    @Nonnull
    public static <K, V> Map<K, V> asMap(@Nullable Object... a) {
        return putAll(new LinkedHashMap<K, V>(), a);
    }

    /**
     * Returns a the given map enriched
     * with the mappings <code>a[0] => a[1], a[2] => a[3], ...</code>.
     * @param a the elements to construct a {@link Map} from.
     * @return a {@link Map} constructed of the specified elements.
     */
    @Nonnull
    public static <K, V> Map<K, V> putAll(@Nonnull Map<K, V> original, @Nullable Object... a) {
        if (a != null) {
            final int length = a.length;
            if (length % 2 == 1) {
                throw new IllegalArgumentException("You must provide an even number of arguments.");
            }
            for (int i = 0; i < length; i += 2) {
                // noinspection unchecked
                original.put((K) a[i], (V) a[i + 1]);
            }
        }
        return original;
    }

    @Nonnull
    public static <K, V> Map<K, V> putAll(@Nonnull Map<K, V> original, @Nullable Map<K, V> other) {
        if (other != null) {
            original.putAll(other);
        }
        return original;
    }
}