Storage objects can be considered: 1, array, 2, collection

/*
* 1, storage objects can be considered: 1, array, 2, collection
* 2, the characteristics of the array storage object:
* Student[]stu = new STUDENT[20];
* Stu[0] = new Student ();
* Insufficient: Once created, its length is immutable;
* The number of objects stored in a real array is not known.
* 3, set
* Collection Interface
* List interface: An orderly, repeatable element that can be stored
* ArrayList (Primary implementation class, preferred), linklist (for frequent delete and insert operations), Vector (Old implementation class, thread safe)
* Set interface: Stores unordered, non-repeatable elements
* Hashset,linkedhashset,treeset
* Map interface: Data that stores key-value pairs
* Hashmap,linkedhashmap,treemap,hashtable (sub-category: Properties)
* */

Storage objects can be considered: 1, array, 2, collection