java体系中，volatile关键字的作用

原創 风雅车手 2020-06-25 09:13
volatile关键字的作用：


1、强制变量，线程直接从内存中读写线程，cpu寄存器变量和主内存变量实时同步；


2、访问一个 volatile 变量会在语句间建立 happens-before 关系


3、确保volatile 变量在jvm编译中的排序，不会乱序；


4、volatile 变量之前的变量也会自动同步到主存；
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