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diff --git a/‎README.zh-CN.md
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diff --git a/‎data-structures/Array/__test__/test_Array.cpp
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diff --git a/‎data-structures/Array/include/String.h
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diff --git a/‎data-structures/HashTable/include/HashTable.h
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+38-1Lines changed: 38 additions & 1 deletion
@@ -25,6 +25,7 @@ Remember that each data has its own trade-offs. And you need to pay attention mo
 * `B` [Array](data-structures/Array)
   * `B` Static Array
   * `B` Dynamic Array
+  * `B` String
 * `B` [Linked List](data-structures/LinkedList)
   * `B` Singly Linked List
   * `B` Doubly Linked List
 
@@ -21,6 +21,7 @@
 * `B` [数组](data-structures/Array)
   * `B` 静态数组
   * `B` 动态数组
+  * `B` 字符串
 * `B` [链表](data-structures/LinkedList)
   * `B` 单向链表
   * `B` 双向链表
 
@@ -200,9 +200,15 @@ void test_vector(){
   std::cout << "*****Vector Test End*****" << std::endl;
 }
 
+void test_String(){
+
+}
+
 int main() {
   test_array();
   std::cout << std::endl;
   test_vector();
+  std::cout << std::endl;
+  test_String();
   return 0;
 }
@@ -0,0 +1,41 @@
+#ifndef STRING_H
+#define STRING_H
+
+#include "./Vector.h"
+
+class String{
+  public:
+    String();
+    ~String();
+  public:
+    // Capacity
+    bool empty() const;
+    size_t size() const;
+    size_t length() const;
+    void resize(size_t n);
+    void clear();
+    void shrink_to_fit();
+    // Elements access
+    char& front();
+    char& back();
+    char& at(const size_t index);
+    char& operator[](const size_t index);
+    // Modifier
+    String& operator+=(const String& str);
+    String& operator+=(const char *s);
+    String& operator+=(const char c);
+  private:
+    Vector<char> _data;
+};
+
+
+// Constructor and Desttructor
+String::String(){
+
+}
+
+String::~String(){
+
+}
+
+#endif // STRING_H
@@ -34,6 +34,8 @@ class HashTable{
     size_t bucket(const Key& key) const;
   private:
     size_t _next_prime(const size_t n) const;
+    size_t _bucket_num(const Key& key, size_t n);
+    size_t _hash(const Key& key);
   private:
     struct _KVNode{
       Key _key;
@@ -47,6 +49,31 @@ class HashTable{
 template <typename Key, typename Value>
 HashTable<Key, Value>::HashTable() : _buckets(*(_prime_list)), _size(0) {}
 
+// Elements access
+template <typename Key, typename Value>
+Value& HashTable<Key, Value>::at(const Key &key){
+
+}
+
+// Buckets
+template <typename Key, typename Value>
+size_t HashTable<Key, Value>::buckets_count() const{
+  return _buckets.size();
+}
+
+template <typename Key, typename Value>
+size_t HashTable<Key, Value>::max_buckets_count() const{
+  return *(_prime_list + _num_primes - 1);
+}
+
+template <typename Key, typename Value>
+size_t HashTable<Key, Value>::bucket_size(const size_t n) const{
+  if(n >= _buckets.size()){
+    throw std::out_of_range("HashTable::bucket_size(): Index out of range");
+  }
+  return _buckets[n].size();
+}
+
 // Private Functions
 template <typename Key, typename Value>
 size_t HashTable<Key, Value>::_next_prime(const size_t n) const{
@@ -61,4 +88,14 @@ size_t HashTable<Key, Value>::_next_prime(const size_t n) const{
   return pos == last ? *(last - 1) : *pos;
 }
 
-#endif // HASHTABLE
+template <typename Key, typename Value>
+size_t HashTable<Key, Value>::_bucket_num(const Key &key, size_t n){
+  return _hash(key) % n;
+}
+
+template <typename Value>
+size_t HashTable<int, Value>::_hash(const int &key){
+  return key;
+}
+
+#endif // HASHTABLE_H