Core Java Complete Notes By Durga Sir Top ❲FULL❳

PriorityQueue , Deque , and ArrayDeque . Map Interface (Key-Value Pairs, Keys are unique): HashMap : Non-synchronized, allows one null key. LinkedHashMap : Preserves insertion order of keys. TreeMap : Keys are sorted. Hashtable : Legacy, synchronized, no nulls allowed. 7. Java Input/Output (I/O) & Serialization How Java interacts with external files and networks.

Executes critical cleanup code (like closing databases or files) regardless of whether an exception was thrown or caught. core java complete notes by durga sir top

class MyThread extends Thread public void run() System.out.println("Thread running"); MyThread t = new MyThread(); t.start(); // Allocates JVM thread stack and calls run() Use code with caution. PriorityQueue , Deque , and ArrayDeque

Stores class-level data, including static variables and bytecode. Keys are unique): HashMap : Non-synchronized

Stores class-level data, including static variables and method bytecode.