multithreading - stop a thread in java after a given time - doesn't work -

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i have complex function (optimisation) can potentially enter in loop or take time, , time allowed set user.

therefore trying make run function in separate thread, , stop if maximum time passed. use code similar 1 below, doesn't work, 

int timemax = 2; //time in minutes   thread thread_object = new thread_class(... args...); try {   thread_object.start();   thread_object.join(timemax*60*1000); }

i think i'm not using function "join" properly, or doesn't have understood. idea?

thanks!

thanks answers, have found better idea here*. works still uses function "stop" deprecated. new code is:

thread thread_object = new thread_class(... args...);  try {   int timemax = 1;   thread_object.start();   thread.currentthread().sleep( timemax * 1000 );      if ( thread_object.isalive() ) {         thread_object.stop();         thread_object.join();     }  } catch (interruptedexception e) {  }

not yet sure of function of "join", i'll have go have @ book.

i suggest use timer.


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