What is Thread Group? Why it’s advised not to use it?

ThreadGroup is a class which was intended to provide information about a thread group. ThreadGroup API is weak and it doesn’t have any functionality that is not provided by Thread. Two of the major feature it had are to get the list of active threads in a thread group and to set the uncaught exception handler for the thread. But Java 1.5 has addedsetUncaughtExceptionHandler(UncaughtExceptionHandler eh) method using which we can add uncaught exception handler to the thread. So ThreadGroup is obsolete and hence not advised to use anymore.

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t1.setUncaughtExceptionHandler(new UncaughtExceptionHandler(){       @Override     public void uncaughtException(Thread t, Throwable e) {         System.out.println("exception occured:"+e.getMessage());     }       });