monitor lock

Sanyou's Java Diary

Apr 20, 2023 · Fundamentals

Mastering Java’s synchronized: How It Works, Optimizations & Best Practices

This article explains the Java synchronized keyword, covering its purpose for thread safety, usage on methods and blocks, underlying monitor lock mechanism, JVM bytecode details, lock optimizations such as spin, bias, lightweight and heavyweight locks, and practical examples including singleton implementation and differences from volatile.