Synchronized statements To create a synchronized statement, you use the synchronized keyword with an expression that evaluates to an object reference, as in the reverseOrder() method below: ...

Understanding Java threads – read the whole series Part 1: Introducing threads and runnables Part 2: Thread synchronization Part 3: Thread scheduling, wait/notify, and thread interruption Part 4 ...

Even when a program contains only a single thread running on a single processor, a synchronized method call is still slower than an un-synchronized method call.