How do dynamic data structures differ from static arrays?

Static arrays and dynamic data structures mainly differ in their ability to change size and memory management:

• Static arrays have a fixed size set at creation and cannot be changed during program execution. For example, in Java, the array int[] arr = new int[10]; will always contain exactly 10 elements.

• Dynamic data structures (such as lists, linked lists, trees) can change their size during execution — adding or removing elements. In Java, classes from collections like ArrayList are often used for this.

Main differences:

Characteristic	Static array	Dynamic data structure
Size	Fixed	Changeable
Memory management	Allocated at once for the entire array	Allocated as elements are added
Performance	Fast index access	May be slower due to memory management
Flexibility	Low	High

Example of a dynamic list in Java:

ArrayList<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
// List size changes dynamically

Thus, dynamic structures are convenient when the data size is unknown in advance or changes, while static arrays are used when the size is fixed and access speed is important.