Java并发编程和高并发的学习笔记总结
并发：同时拥有两个或者多个线程，如果程序在单核处理器上运行，多个线程将交替的换入或者换出内存， 这些线程是同时"存在"的，每个线程都处于执行过程中的某个状态， 如果运行在多核处理器上，此时，程序中的每个线程都将分配到一个处理器核上，因此可以同时运行。
高并发：是互联网分布式系统架构设计中必须考虑的因素之一， 它通常是指，通过系统设计保证系统能够同时并行处理很多请求。
理解：
并发：多个线程操作相同的资源,保证线程安全，合理使用资源
高并发：服务能同时处理很多请求，提高程序性能
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