How can I achieve good validation check on String Input?

This is a portion of my code,am just starting to learn java programming.public class Thickness
public Thickness(){
public static void main(String[]args)
int thickness=0;
double length;
String strL;
strL=JOptionPane.showInputDialog(null,"Enter the length of your building:");
length=Double.parseDouble(strL);
while((length<4)||(length>12))
JOptionPane.showMessageDialog(null,"Error!This Program only works for"+"\n"+"Building whose Length lies Between 4m and 12m:");
strL=JOptionPane.showInputDialog(null,"Enter the length of your building:"+"\n"+"Note that Minimum Length is 4m:"+"\n"+"Maximum Length is 12m:");
length=Double.parseDouble(strL);
So that if the user enters a length outside the specified range of values the error message,"Error!This Program only works for"+"\n"+"Building whose Length lies Between 4m and 12m:" will be displayed and the program will prompt the user to re-enter the length.
This validation check works perfectly as long as the input is double or integer,What I need now is to include a check to display an error message if the user inputs nothing or supplies a character (other than integer or double)as input.I want to be able to customise the error message,like having(JOptionPane.showMessageDialog(null,"Error!This is an invalid input:")).
I know the compiler will also generate an error message if the user inputs a String instead of a double,but I want to be able to achieve this instead of the compiler doing it for me.
pls I will be very happy if you can assist me with the code that would perform this check.
Thanks in advance

length=Double.parseDouble(strL);Read the API. It tells you that it can throw some kind of exception if the input isn't valid. Then it's up to you to properly handle the exception. If you don't handle it, the VM does by displaying the exception and terminating the app.
API docs:
http://java.sun.com/j2se/1.5.0/docs/api/index.html
Tutorial on exceptions:
http://java.sun.com/docs/books/tutorial/essential/exceptions/index.html

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