Question

I am trying to assign a default value to variable if the variable holds an empty string. I used the following codes but they are not working out:

if (d.lat.trim().isEmpty())
   latt = 9.0819990;
else {
   latt = Double.valueOf(d.lat.trim()).doubleValue();
}

The above code results in an error:

cannot find symbol
symbol  : method isEmpty()
location: class java.lang.String

then I used

if (" ".equals(d.lat.trim()))
   latt = 9.0819990;
else {
   latt = Double.valueOf(d.lat.trim()).doubleValue();
}

The code above jumps the if section and tries to convert the empty String into double thereby throwing error about empty string.

SO, what am I doing wrong?

Answer 1

The empty string is "", not " " (note that there is no space between the quotes).