java - How to use the execution time method with try and catch -

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i trying measure execution time, not know method before try block or inside??

ublic static void main(string[] args) {     long starttime = system.currenttimemillis();      try {          searchdetailsdialog dialog = new searchdetailsdialog(null);         dialog.setdefaultcloseoperation(jdialog.dispose_on_close);         dialog.setvisible(true);     } catch (exception e) {         e.printstacktrace();     }long endtime   = system.currenttimemillis();     long totaltime = ((endtime - starttime)/1000);     system.out.println("the execution time is:");     system.out.println(totaltime); }

neither. in case best is:

long starttime= system.nanotime() ; try {     searchdetailsdialog dialog = new searchdetailsdialog(null);     dialog.setdefaultcloseoperation(jdialog.dispose_on_close);     dialog.setvisible(true); } catch (exception e) {     e.printstacktrace(); } {     long endtime= system.nanotime() ;     double totaltime= ((double)(endtime - starttime)/1000000000) ;     system.out.printf("the execution time is: %.3f seconds",totaltime); }

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