摘要：
官网描述 join Waits for this thread to die. An invocation of this method behaves in exactly the same way as the invocation join(0) An invocation of this m 阅读全文
摘要：
官网API解释 setDaemon public final void setDaemon(boolean on) Marks this thread as either a daemon thread or a user thread. The Java Virtual Machine exits 阅读全文