question: public void run ( ) { Thread currentThread = Thread . currentThread ( ) ; String oldName = currentThread . getName ( ) ; if ( newName != null ) { setName ( currentThread , newName ) ; } try { runnable . run ( ) ; } finally { setName ( currentThread , oldName ) ; } }
target:  Run the runnable after having renamed the current thread's name  to the new name. When the runnable has completed, set back the  current thread name back to its origin. 