c#转JAVA问题，麻烦帮忙把这个类转成java语法的

/// <summary>
    /// 类
    /// </summary>
    /// <typeparam name="K1"></typeparam>
    /// <typeparam name="K2"></typeparam>
    /// <typeparam name="V"></typeparam>
    public class MultiKeyDictionary<K1, K2, V> : Dictionary<K1, Dictionary<K2, V>>
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="key1"></param>
        /// <param name="key2"></param>
        /// <returns></returns>
        public V this[K1 key1, K2 key2]
        {
            get
            {
                if (!ContainsKey(key1) || !this[key1].ContainsKey(key2))
                    throw new ArgumentOutOfRangeException();
                return base[key1][key2];
            }
            set
            {
                if (!ContainsKey(key1))
                    this[key1] = new Dictionary<K2, V>();
                this[key1][key2] = value;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="key1"></param>
        /// <param name="key2"></param>
        /// <param name="value"></param>
        public void Add(K1 key1, K2 key2, V value)
        {
            if (!ContainsKey(key1))
                this[key1] = new Dictionary<K2, V>();
            this[key1][key2] = value;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="key1"></param>
        /// <param name="key2"></param>
        /// <returns></returns>
        public bool ContainsKey(K1 key1, K2 key2)
        {
            return base.ContainsKey(key1) && this[key1].ContainsKey(key2);
        }

        /// <summary>
        /// 
        /// </summary>
        public new IEnumerable<V> Values
        {
            get
            {
                return from baseDict in base.Values
                       from baseKey in baseDict.Keys
                       select baseDict[baseKey];
            }
        }
    }

直接转恐怕不行吧，对着功能改到时没问题。

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