请写出创建空集合的语句

在不同的编程语言中，创建空集合的方式各不相同。以下是几种常见语言的示例：

1. **Java**:
- `ArrayList`: `ArrayList<String> list = new ArrayList<>();`
- `HashSet`: `HashSet<Integer> set = new HashSet<>();`
- `HashMap`: `HashMap<String, String> map = new HashMap<>();`

2. **Python (列表)**:

   empty_list = []

3. **Python (集合)**:

   empty_set = set()

4. **JavaScript (数组)**:

   let emptyArray = [];

5. **C# (List)**:

   List<int> myList = new List<int>();

6. **C# (Dictionary)**:

   Dictionary<string, int> myDict = new Dictionary<string, int>();

7. **C++ (std::vector)**:

   std::vector<int> vector;

8. **C++ (std::set)**:

   std::set<int> set;