Java Help Please! I created this ISP program. Having a hard time figuring out how to

[Jen]

code so they can't? put less than zero. I am sure it is simple and I am having a brain fart. How do I add " >=0" and tell them this is a no no! LOL!!!! Thank you soooo much!


public class ISP

{
private char pack;
private double hours;

public ISP()
{
pack='A';
hours=0;
}



public ISP(char p, double h)
{
pack=p;
hours=h;
}



public void setpackage(char p)
{
pack=p;
}



public char getpackage()
{
return pack;
}



public void sethour(double h)
{
hours=h;
}




public double gethour()
{
return hours;
}




public double calculateMonthlyBill()
{
double bill,h;
if(pack=='A')
{
h=hours-10;
bill=9.95+(2*(int)(h+.5)); //round hours up
}

else if(pack=='B')
{
h=hours-20;
bill=14.95+(int)(h+.5); //round hours up
}

else
bill=19.95; //round hours up
return bill;
}
}





import java.util.Scanner;

public class Assignment04
{
public static void main(String[] args)
{

CurrentDateTime now = new CurrentDateTime();

char choice;
String c;
double h;

System.out.println(now.getDateTime());
System.out.println("\nEnter the package:\n ");
Scanner in = new Scanner (System.in);


do
{
System.out.println("A. Package A\nB. Package B\nC. Package C");
c=in.next();
choice=c.charAt(0);

if(choice<'A'||choice>'C')
System.out.println("Invalid choice");
}


while(choice<'A'||choice>'C');
System.out.println("Enter hours used: ");
h=in.nextDouble();
ISP isp = new ISP(choice,h);


System.out.printf("Your bill is is $%.2f\n",isp.calculateMonthlyBill());

}
}






import java.text.*;
import java.util.*;


public class CurrentDateTime
{
public String getDateTime ()
{
String rv = "";
Date today = new Date();
SimpleDateFormat sdf_date = new SimpleDateFormat("E, MMMM d, y");
SimpleDateFormat sdf_time = new SimpleDateFormat("h:mm a");

rv = sdf_date.format(today) + " at " + sdf_time.format(today);
return rv;
}
}