Run Time Errors, Please Help.

Question

I am getting errors of:
Exception in thread "main" java.lang.NumberFormatException: feet
at java.lang.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Double.parseDouble(Unknown Source)
at SquareDriver.main(SquareDriver.java:29)
her is my code:
import cs1.Keyboard;
import java.util.*;
import square;
import java.lang.*;
public class SquareDriver
     public static void main (String [] args)
          double dblLength = 0;
          String strUnits;
          StringTokenizer Tokenizer;
          final String SENTINEL = "0";
          String strPart1= null;
     String strPart2 = null;
          System.out.println("Enter a Side Length Of a Sguare");
          strUnits = Keyboard.readString( );
          Tokenizer = new StringTokenizer (strUnits);
     while (!strUnits.equals(SENTINEL))
          if (Tokenizer.hasMoreTokens())
          { strPart1 = Tokenizer.nextToken();
          dblLength=Double.parseDouble(strPart1);
          if (Tokenizer.hasMoreTokens())
          {strPart2=Tokenizer.nextToken();
square mysquare = new square(dblLength,strPart2);
System.out.println(mysquare);
}//end of main method;
}// end of class;
public class square
     public double dblPart1;
public String strPart2;
public double dblArea;
public double Perimeter;
     public square (double Length, String Units)
          dblPart1 = Length;
          strPart2 = new String(Units);
     public double dblArea()
     {dblArea = (dblPart1 * dblPart1);
       return dblArea;
     public double Perimeter()
     {Perimeter = (dblPart1 * 4);
      return Perimeter;
     public String toString()
     String output= new String("");
          String tab = "\t";
          String newline ="\n";
          output+= "Area" tabdblArea()+strPart2+ "Squared";
          output+=newline;
          output+= "Perimeter"+tab+Perimeter()+strPart2 ;
          output+=newline;
          return output;
} // end of class square

Answer 1

You are trying to parse a string "feet" to a number (double).