Convert from double to long without Round Java -

i'm trying convert random double long without rounding or truncating it. first change double string, know how many decimal places there , change value long. problem number of last decimal place not correct , don't know reason , how can change it. here code:

            double z=(double) myrandom(1, 20);     long test;     string s = double.tostring(z);     test=(long) (math.pow(10, s.length()-s.indexof(".")-1)*z);     system.out.println("z: "+z);         system.out.println("double converted long: "+test); 

and that's output:

d: 19.625014811604743

double converted long: 19625014811604744

d: 9.143326452202839

double converted long: 9143326452202838

d: 5.8964228376511105

double converted long: 58964228376511104

d: 15.045936360299917

double converted long: 15045936360299918

d: 14.147950026532694

double converted long: 14147950026532694

editing current implementation:

double z=(double) myrandom(1, 20); string s = double.tostring(z); //convert string (edited comments) s = s.replaceall(".", ""); //remove period long test = long.parselong(s); //convert long 

or if want random long recommend using random.nextlong() instead.