Java Concurrency
Java makes concurrency available to you through the language and APIs. Java programs can have multiple threads of execution, where each thread has its own method-call stack and program counter, allowing it to execute concurrently with other threads while sharing with them application-wide resources such as memory and file handles. This capability is called multithreading.
Performance Tip 23.1
A problem with single-threaded applications that can lead to poor responsiveness is that lengthy activities must complete before others can begin. In a multithreaded application, threads can be distributed across multiple cores (if available) ...
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