//默认大小
    static final int DEFAULT_INITIAL_CAPACITY = 1 << 4;

    //最大值
    static final int MAXIMUM_CAPACITY = 1 << 30;

    //扩列的系数因子
    static final float DEFAULT_LOAD_FACTOR = 0.75f;

    //hash桶，内部存放列表，长度是2的次方，初始化时为0
    transient Node[] table;

    //加载因子，用来计算哈希表元素数量的阈值， threshold = 哈希桶.length * loadFactor
    final float loadFactor;

    //哈希桶内部的阈值，当哈希桶元素超过阈值时，会发生扩容resize()
    int threshold;

    transient int modCount;

    //元素长度
    transient int size;

    //用来判断节点上链表是否转红黑树的值
    static final int TREEIFY_THRESHOLD = 8;
    �