Java应用程序生命周期

Question

典型的 Java 应用程序何时完成？

如果我在 main 方法中启动一个新线程，然后 main 方法完成，但另一个线程继续工作，则应用程序仍将运行，直到全部完成为止。线程已经死了，不是吗？

谢谢，圣诞快乐!

Answer 1

是的，除非它是守护线程。引用自Thread API :

When a Java Virtual Machine starts up, there is usually a single non-daemon thread (which typically calls the method named main of some designated class). The Java Virtual Machine continues to execute threads until either of the following occurs:

• The exit method of class Runtime has been called and the security manager has permitted the exit operation to take place.
• All threads that are not daemon threads have died, either by returning from the call to the run method or by throwing an exception that propagates beyond the run method.