1.使用迭代器的remove方法,可以边遍历边删除元素 2.线程 启动线程 new thread().start() new thread(new runnable()).start() 普通方法…
源码 /*** This is a cute function used to replace migration up/down functionality.* It performs check storage schema with actual db schema and:* * if there are excess tables exist in db they are ignored (not dropped)* * every table from storage is comp…
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官方文档
Synchronization mechanisms overview
Named And Anonymous Synchronization MechanismsTypes Of Synchronization Mechanisms如前所述,如果不能有效地同步对内存的访问,那么通过内存映射文件或共享内存对象在进程之间共享内存的能力…