public void clear() {
        modCount++;
        Entry[] tab = table;
        for (int i = 0; i < tab.length; i++)
            tab[i] = null;
        size = 0;
    }
Removes all of the mappings from this map. The map will be empty after
this call returns.
src/main/java/com/alibaba/fastjson/util/AntiCollisionHashMap.java