java - Call start method two times -



java - Call start method two times -

why next code throws exception?

class mythread extends thread { public static void main (string [] args) { mythread t = new mythread(); t.start(); system.out.print("one. "); t.start(); system.out.print("two. "); } public void run() { system.out.print("thread "); } }

could point me out jls?

that's contract of start() method :

public void start() causes thread begin execution; java virtual machine calls run method of thread. result 2 threads running concurrently: current thread (which returns phone call start method) , other thread (which executes run method). never legal start thread more once. in particular, thread may not restarted 1 time has completed execution. throws: illegalthreadstateexception - if thread started.

you can't start thread twice.

java multithreading

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