java - Getting Line number of code executed -

i writing application automated generation of unit test cases.the application takes input .java file , process's find methods. methods invoked using test data using following command. method.invoke(classobj,methodarg); wish find lines executed int invoked method calculate coverage. have tried doing using stacktrace() gives line number of application code. can me this. , utterly lost. highly appreciated. current code is:

    runnable myrunnable;     myrunnable = new runnable(){     public void run(){     try {        int returnvalint = (int) fm.invoke(fobj, fargs);       system.out.println(new exception().getstacktrace()[0].getlinenumber());                                       } catch (illegalaccessexception ex) {       logger.getlogger(helloworldframe.class.getname()).log(level.severe, null, ex);     } catch (illegalargumentexception ex) {       logger.getlogger(helloworldframe.class.getname()).log(level.severe, null, ex);     } catch (invocationtargetexception ex) {       logger.getlogger(helloworldframe.class.getname()).log(level.severe, null, ex);     }   } }; thread th= new thread(myrunnable, "th"); th.start(); 

you can read how coverage tools collect stats here.

but before that, you're trying isn't going use - whole point of test test intent of piece of code. need know boundaries are, expect results be.

for example:

public class math {   public static long add(long a, long b)   {     return + b;   }     public static long multiply(long a, long b)   {     return * b;   }  }  public class mathtest {   @test   public void testadd()   {     asserttrue(5, math.add(2, 3));   }    @test   public void testmultiply()   {     asserttrue(6, math.multiply(2, 3));   } } 

you unable generate test code method signatures alone. have introduce test data, feasibly define method applies to, in more simple cases such data become test case , you've achieved introduction of additional layer of complexity.

at end of day unit test test data test specification can defined well.