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四、java中的线程安全等级不可变：可以是基本类型的final；可以是final对象，但对象的行为不会对其状态产生任何影响，比如String的subString就是new一个String对象各种Number类型如BigInteger和BigDecimal等大数据类型都是不可变的，但是同为Number...

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一、了解几个概念 1）临界区：临界区指的是一个访问共用资源（例如：共用设备或是共用存储器）的程序片段，而这些共用资源又无法同时被多个线程访问的特性。当有线程进入临界区段时，其他线程或是进程必须等待，有一些同步的机制必须在临界区段的进入点与离开点实现，以确保这些共用资源是...

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