My String result is: 3.1
I want to convert it into long :
I use some code like :
String txt_capplot="3.1";
Long.parseLong(String.valueOf(txt_capplot));
After Execute It made some error like:
java.lang.NumberFormatException: For input string: "3.1"
How to solve this?
Long is like integer it cant have decimal on them, but it will round it off.
solution:
you need to parse it to double first and then cast it to long.
sample:
String s = "3.1";
double d = Double.valueOf(s);
long l = (long) d;
Since long does not contains decimal fractions, So need to convert your String to double and then the long.
You should try this one line solution :
Double.valueOf(txt_capplot).longValue();
Long doesn't have a decimal part so you need to decide if you want to round it or truncate it. This code shows both
package se.wederbrand.stackoverflow;
public class ConvertToLong {
public static void main(String[] args) {
String s = "3.6";
double d = Double.parseDouble(s);
long truncated = (long) d;
long rounded = Math.round(d);
System.out.println(" original: " + s);
System.out.println("truncated: " + truncated);
System.out.println(" rounded: " + rounded);
}
}
