Java Data StructuresLesson 59Free preview

Java Data Structures

This lesson is part of Java · All levels

Summary

Data structures are a way of organizing and storing data so that it can be easily accessed and manipulated. Java provides a ready-made structure in the java.util package, for example ArrayList for dynamic lists, HashSet for unique data, and HashMap for key-value pairs. Choosing the right structure makes the program faster and more memory-efficient.

Key points

Key examples: ArrayList, LinkedList, HashSet, TreeSet, HashMap, ArrayDeque, PriorityQueue
Common structures such as arrays, linked lists, stacks, queues, and trees are available in Java
Generic keep the type of element safe without manual casting
Java standard interface: list, set, map, queue, deque, iterator
Choose decisions based on needs: sequence, duplicate, access speed, and frequency of change

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