Packages and such

Question

OK, so.. we're learning about superclasses etc. I have a couple of problems. First of all I need to calculate profit in the SoldCar class below - one number - profit - can be declared within that class. The other number needed, dealerCost is within another class, Cars which is imported above. I have included the imported files as well as the one in question. SoldCars is currently throwing several compile errors also.
(Car.java compiles fine as does Date.java)
//******************************Car.java******************
package car;
public class Car
float dealerCost;
int idNumber;
String dateArrived;
public Car(float dCost, int idNo, String dArrive)
dealerCost = dCost;
idNumber = idNo;
dateArrived = dArrive;
public float knowdCost()
return dealerCost;
public int knowidNo()
return idNumber;
public String knowdArrive()
return dateArrived;
public void print()
System.out.println("Dealer cost:" + " " + dealerCost);
System.out.println("ID number:" + " " + idNumber);
System.out.println("Date arrived:");
System.out.println(dateArrived);
//***************************end Car.java****************************
//******************************Date.java****************************
package date;
public class Date
public int day;                         // Data fields
public int year;
public String month;
public Date(int newDay, String newMonth, int newYear)     // Methods
day = newDay;
month = newMonth;
year = newYear;
public int dayIs()
return day;
public String monthIs()
return month;
public int yearIs()
return year;
public void print()
System.out.println(month + " " + day + ", " + year);
//*****************************end Date.java*************************
//*****************************SoldCars.java*************************
//****************************the problem child!*********************
import cars.*;
import date.*;
package soldcar;
public class SoldCar extends Car
float price;
String customer;
Date dateSold;
float profit;
public SoldCar()
super(14000.0f, 1245632, Date);
public SoldCar(float price1, String customer1, Date dSold, float prof)
price = price1;
customer = customer1;
dateSold = dSold;
//profit = 14000.0f - price1;
public float knowprice1()
return price;
public String knowcustomer1()
return customer;
public Date knowdSold()
return dateSold;
public float calcprof()
return profit;
public void print()
System.out.println(price);
System.out.println(customer);
System.out.println(dateSold);
//************************end SoldCars.java***************************
To add to the fun, our assignment is to put "Car.java" into a subfolder named cars and Date.java into a folder named Date. Sold Cars and Car.java are in the same folder/subfolder.
Thanks in advance...K

Answer 1

Move Car.java in a folder called car, Date.java in a folder called date and SoldCar.java in a folder called soldcar. Then go to the parent folders of them and say: "javac soldcar/SoldCar.java". This tries to compile SoldCar.java, but while compiling it it notices that it first needs to compile Car.java and Date.java too and does the job for you.