By Durga Sir Top |verified| — Core Java Complete Notes

Core Java complete notes by Durga Sir are widely considered the gold standard for mastering Java fundamentals and preparing for certification exams like OCJP (Oracle Certified Java Professional). Created by Mr N. Durga Prasad, the founder of Durga Software Solutions, these materials bridge the gap between academic learning and corporate requirements. Why Durga Sir's Java Notes are Highly Rated

Here are some of the key topics covered in Durga Sir's Core Java notes: core java complete notes by durga sir top

5. Multithreading & Concurrency

• Thread basics: Thread vs Runnable, lifecycle, start vs run, join, sleep, interrupt.
• Synchronization: synchronized methods/blocks, intrinsic locks, reentrant locks (ReentrantLock), visibility and atomicity.
• Inter-thread communication: wait(), notify(), notifyAll().
• High-level concurrency: Executors, ScheduledExecutorService, ForkJoinPool, parallel streams.
• Atomic classes & Locks: AtomicInteger, AtomicReference, ReadWriteLock, StampedLock.
• Memory Model: volatile keyword, happens-before relationship, instruction reordering.

JDBC & Database Access

: A deep dive into integral types, floating-point types, and the nuances of primitive vs. object-based types. Core Java complete notes by Durga Sir are

18. Cheat-sheet (One-liners)

• String immutable; StringBuilder mutable.
• equals() & hashCode() must be overridden together.
• Use Concurrent collections for multi-threaded access.
• Prefer try-with-resources for I/O/JDBC.
• Use PreparedStatement to prevent SQL injection.

Durga Sir’s curriculum is typically structured into the following key chapters : Durga Sir's Java Notes Overview | PDF - Scribd Thread basics: Thread vs Runnable, lifecycle, start vs

How to Get the Most Out of Them

1. Watch Durga Sir’s free videos (available on YouTube – “Durga Software Solutions”) alongside the notes.
2. Try every code example manually in your IDE.
3. Attempt the “Exercise” sections – many have hidden interview patterns.
4. Revise the “Rule Summary” pages before any Java interview.