BdHashMap<K,V> data = new BdHashMap<>();

• isEmpty() data structure is emtpy true ,not empty false
• add(key value) Key is type K, value is type V
• remove(int index) This method deletes a data
• indexOf(int index) This method returns a single data
• get(key) This method returns value
• length() Data structure length

• boolean isEmpty()
• void add()
• void remove(int index)
• Data<K,V indexOf(int index)
• V get(K key)
• int length()

Data<K, V> data = new  Data<>();

• setKey(K key);
• setValue(V value);
• K getKey();
• V getValue();

BdJson json = new BdJson()

• BdHashMap[] getBdHashMap();
• void setBdHashMap(BdHashMap [] bdHashMaps);
• String toJson();