Learning Notes

Study Index

A central hub for all study guides — organized by topic, built for quick access and revision.

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Java
01

JDBC & Transactions

Java Database Connectivity — architecture, the 6 connection steps, CRUD, PreparedStatement, and transaction control with COMMIT & ROLLBACK.

JDBC API PreparedStatement ACID
Open guide 02

Intro to Threads

Program vs. process vs. thread, concurrency & parallelism, Runnable, core thread methods, the thread life cycle, and parallelization performance.

Runnable Life Cycle join() / sleep()
Open guide 03

Thread Synchronization

Race conditions, synchronized & monitors, volatile, ReentrantLock, Semaphore, ReadWriteLock, wait()/notify(), and the Producer-Consumer pattern.

synchronized volatile Producer-Consumer
Open guide
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SQL
01

Database & SQL

From foundations to advanced querying — complete notes covering DDL, DML, joins, subqueries, aggregation, and more.

DDL / DML Joins Subqueries
Open guide