threadlocalmap uses open addressing to resolve hash conflicts, but the design of node in threadlocalmap is still

static class Entry extends WeakReference<ThreadLocal<?>> {
            /** The value associated with this ThreadLocal. */
            Object value;

            Entry(ThreadLocal<?> k, Object v) {
                super(k);
                value = v;
            }
        }
        

in that case, what is the use of the entry in this Entry?
and why does this structure have no key?