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Java 最常见的面试题：在 java 程序中怎么保证多线程的运行安全？

线程安全在三个方面体现：原子性：提供互斥访问，同一时刻只能有一个线程对数据进行操作，（atomic,synchronized）；可见性：一个线程对主内存的修改可以及时地被其他线程看到，（synchronized,volatile）；有序性：一个线程观察其他线程中的指令执行顺序，由于指令重排序，该观察...

编写Java程序，实现多线程操作同一个实例变量的操作会引发多线程并发的安全问题。

需求说明：多线程操作同一个实例变量的操作会引发多线程并发的安全问题。现有 3 个线程代表 3 只猴子，对类中的一个整型变量 count（代表花的总数，共 20 朵花）进行操作。该变量代表花的总数，不同猴子（线程）每采摘一次，花的总数少 1，直至所有花被不同的...

为什么在Java程序代码优化中多线程在未发生线程安全前提下应尽量使用HashMap？

编写一个Java程序实现多线程，在线程中输出线程的名字，隔300毫秒输出一次，共输出20次。

在 Java 程序中怎么保证多线程的运行安全？

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