@Override
    public boolean containsKey(Object key) {
        return kvMap.containsKey(key);
    }
two-way map, you can get key by value, or get value by key.

@author <a href=mailto:zhanggeng.zg@antfin.com>GengZhang</a>
core/common/src/main/java/com/alipay/sofa/rpc/common/struct/TwoWayMap.java