private boolean isNaN(String str)
{
int j = 0;
while (j < str.length() &&
Character.isDigit(str.charAt(j)))
j++;
if (j == str.length())
return false; //System.out.println(strArr[i] + " is a num");
else
return true; //System.out.println(strArr[i] + " is not a num");
}