Which of the following is true regarding main Thread? (a) It is the thread from which other "child" threads will be spawned. (b) It must be the last thread to finish execution. When the main thread stops, the program terminates. (c) It has the highest priority. (d) main is not a thread. Their answer is (a) and (b) but I think it should only be (a). Could someone explain why they chose be also. Thanks
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.
Hence b is not true, since you can create a new thread in the main method and start it. As a result the new Thread will be running and the main will terminate but the program will still be running until the created thread dies too. HIH ------------------ Valentin Crettaz Sun Certified Programmer for Java 2 Platform