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In the Qt framework, there are several commonly used data containers, which provide developers with a convenient way to store, manage and manipulate data collections. The following are some commonly used data containers in Qt:

1. QList:
   QListIs a template class used to store a list of elements of the same type. It provides fast index-based access and can quickly add and remove elements from the end of the list.QListIt is one of the most commonly used containers in Qt.

2. QVector:
   QVectorandQListSimilar to , it is also a dynamic array.QListcompared to,QVectorThe list is stored contiguously in memory, so it may be more space efficient and faster to access in some cases. However, inserting or deleting elements in the middle of the list may result in higher overhead because a large number of elements may need to be moved.

3. QMapandQHash:
   Both containers are used to store key-value pairs.QMapIt is implemented based on a red-black tree, so its elements are always stored in key order.QHashIt is implemented based on a hash table, which provides faster search speed, but the order of elements is not certain.QMapstillQHashIt depends on your specific needs, such as whether you need to keep the order of elements.

4. QSet:
   QSetis a set that does not contain duplicate elements. It is based onQHashImplementation, so the search is fast. If you need a collection without duplicates,QSetis a good choice.

5. QStringList:
   This is a special container for storing string lists. It provides many convenient functions for operating string lists, such as splitting, merging, etc.QStringListEssentiallyQList<QString>, but adds many convenience functions for string operations.

6. QByteArray:
   QByteArrayIs a class for processing byte arrays. It can not only store byte data, but also provides many convenient operation functions, such as append, delete, replace, etc. Although it is not a general container class, it is very useful when processing binary data or raw byte streams.

7. QVariantList, QVariantMap, QVariantHash:
   These containers areQList<QVariant>, QMap<QString, QVariant>, andQHash<QString, QVariant>They are used to store and processQVariantThis is very useful when dealing with different types of data, especially when parsing and generating JSON data.

These container classes provide Qt developers with flexible and powerful data structures to adapt to various application scenarios. When choosing a suitable container, you need to consider factors such as data access mode, storage requirements, and performance requirements.