The Mutex Club: Mastering LockSupport.unpark() for Robust Java Concurrency
TL;DR; Park/unpark gives each thread a single ‘permit’: no more stacking, no more lost wakeups. It’s the low-level muscle…
The Mutex Club: Park or Perish with Java’s LockSupport.park()
Key Insights ### Bare-Metal Thread Blocking Ever wondered how Java tames threads under the hood? LockSupport.park() is the primitive that puts…
The O(n) Club: Asteroid Collision: Simulate, Stack, Survive (LeetCode 735)
The O(n) Club: Asteroid Collision—Simulate, Stack, Survive (LeetCode 735) ⚡ TL;DR Bunch of asteroids, each moving left or right. When they…
The O(n) Club: Distinct Subsequences, or How to Skip Letters Like a Pro (and Keep Your Sanity)
The O(n) Club: Distinct Subsequences, or How to Skip Letters Like a Pro (and Keep Your Sanity) ⚡ TL;DR Want the number of ways to get t as a…
The Mutex Club: Java’s StampedLock — Three Modes, One Sharp Edge
Introduction StampedLock is the concurrency Swiss Army knife you never knew you needed—until you cut yourself on the corkscrew. Introduced in…
The Mutex Club: ReentrantReadWriteLock—Concurrency Lifesaver or Disaster Waiting to Happen?
A Concurrency Playground or a Deadlock Dungeon? Think your Java app needs speed? Enter ReentrantReadWriteLock, the bouncer that lets a swarm…
The O(n) Club: How Many Ways Can You Lose Count? (A Java Dev’s Guide to Combination Sum IV)
The O(n) Club: How Many Ways Can You Lose Count? (A Java Dev’s Guide to Combination Sum IV) ⚡ TL;DR You want to count the number of…
The O(n) Club: Remove Element — How to Clean Arrays Without Panic or Pain
The O(n) Club: Remove Element — How to Clean Arrays Without Panic or Pain ⚡ TL;DR LeetCode #27 in plain English: Pretend you actually like…
The Mutex Club: tryLock()—Power Tool or Bug Factory?
Key Insights – Non-blocking magic: tryLock() grabs a mutex if it’s free and immediately returns a boolean instead of parking your…
The Mutex Club: Taming Java’s ReentrantLock Like a Pro
Key Insights # What Is ReentrantLock? ReentrantLock from java.util.concurrent.locks is Java’s explicit, flexible alternative to the…