multithreading - Killing Process after specific time(Java) -

i want have mechanism expected process shouldn't run more specific time. after specific time over, status whether process running or not should displayed , process should no longer run.

for tried make 2 classes execute , check, execute object's run method execute process. check object sleep specific time, after checks whether object of execute still running. if running check object expected kill thread , print "yes". else, check object should print "no".

 class execute extends thread{         public void run(){             //execute process         }         public static void main(string[] args){             execute ex = new execute();             ex.start();             check ch = new check(ex);             ch.start();         }     }     class check extends thread{         execute ex;         check(execute ex){             this.ex = ex;         }         public void run(){             try{thread.sleep(5000);} //specific time given 5 seconds.             catch(exception e){system.out.println(e);}             if(ex.isalive()){             system.out.println("yes");             //kill thread ex.             }             else system.out.println("no");         }     } 

my questions are:

• how can kill ex thread?
• what best way implement mechanism?

there no 100% safe way in java.

the recommend approach interrupt execute thread

if(ex.isalive()){         system.out.println("yes");         //kill thread ex.         ex.interrupt() } 

but work, inside execute run() method logic need check if interrupted() returns true , if so, stop computations (for example if run method in loop, first statements inside loop check. interrupt break "blocking" operations wait(), sleep(), io operations, affect both "code" , let's call them "system" methods (that why example sleep throws interruptedexception).

nevertheless need in control of run() method code add necessary checks , stops execution.

the hardcore way of stoping thread calling

ex.stop() 

as can see in javadoc deprecated , should not used can cause problems (read doc). way of stoping thread exectues code don't have control over.

my approach be, first interrupt, wait see if worked , if not forcible stop thread.

if(ex.isalive()){         system.out.println("yes");         //kill thread ex.         ex.interrupt();         ex.join(100); //give ex thread chance stop in clean way         if (ex.isalive()) {            ex.stop();         } }