What are the main types of data structures for storing collections and their features?

In Android (and Java in general), the following main data structures are often used to store collections:

• List — an ordered set of elements allowing duplicates. It allows access to elements by index. Examples: ArrayList (fast access by index, slow insertions/deletions in the middle), LinkedList (fast insertions/deletions, slow access by index).

• Set — a collection of unique elements without a specific order. Examples: HashSet (fast search, insertion, deletion), TreeSet (sorted set).

• Map — stores key-value pairs, with unique keys. Examples: HashMap (fast access by key), TreeMap (sorted keys).

• Queue — a data structure for processing elements in queue order (FIFO). Example: LinkedList can be used as a queue.

Each structure has its own characteristics regarding operation speed and memory requirements; the choice depends on specific tasks.