Car Inventory Problems

[Kevin Quarles]

Hello,

First, I will apologize for the length of this. I have an assignment for a Inventory Program which I have a couple of errors that are causing me to lose sleep. I have been pulling an all-nighter on this, and I just can not seem to figure this one out.

The assignment overview:

Modify the Inventory Program so the application can handle multiple items. Use an array to store the items. The output should display the information one product at a time, including the item number, the name of the product, the number of units in stock, the price of each unit, and the value of the inventory of that product. In addition, the output should display the value of the entire inventory.
Create a method to calculate the value of the entire inventory.
Create another method to sort the array items by the name of the product.

Here are the codes

Inventory2:

  // Inventory Class

import java.util.Scanner; //uses class Scanner

public class Inventory2
{
// begin class Inventory2
public static void main(String[] args)
{
//begin method main

// create Car Array
Car[] Car = new Car[5];
Car[0] = new Car();
Car[0].getName();
Car[0].getPrice();
Car[0].getItemno();
Car[0].getNstock();

int CarCount = 0;
float totalValue = 0;

Scanner input = new Scanner(System.in); // create scanner



// begin display method
System.out.print("Enter up to 5 Car Names or STOP to Exit: ");
String nameInput = input.next(); //read Car name


while (!nameInput.equalsIgnoreCase("STOP"))
{// begin main While

Car[CarCount] = new Car();
Car[CarCount].setName(nameInput);

System.out.print("Enter Price of this Car: "); // prompt for price
Car[CarCount].setPrice(input.nextFloat()); // price input from user.
while (Car[CarCount].getPrice()<= 0)
{// begin while
System.out.print("Price Must Be Greater Than Zero. Enter Price: ");
Car[CarCount].setPrice(input.nextFloat()); // Car price loop from user.
} // End while

System.out.print("Enter Car Item Number: "); // prompt for Car item number
Car[CarCount].setItemno(input.nextInt()); // Car item number input from user

System.out.print("Enter Number of these Cars in Stock: "); // prompt for Car stock
Car[CarCount].setNstock(input.nextInt()); // Car in stock input from user


System.out.print("Car "+Car[CarCount].getName()+", Item Number "+Car[CarCount].getItemno()+","); // display name
System.out.printf(" is worth %c%.2f.\n", '$', Car[CarCount].getPrice()); // display individual price
System.out.printf("We have %d copies in stock, making our inventory for this Car worth %c%.2f\n", Car[CarCount].getNstock(), '$', Car[CarCount].getValue()); //inventory value

try
{
totalValue = totalValue + Car[CarCount].getValue();
}

catch(NullPointerException npe)
{

} // handles exception

CarCount++;

System.out.print("Enter up to 5 Car Names or STOP to Exit: "); // internal loop prompt
nameInput = input.next(); //name input from user

} // End main While


System.out.printf("Entire Inventory for all Cars is Worth %c%.2f.\n",'$', totalValue);
System.out.print("Ending Program.");


}// end method main
} // end class

  

Here is the Car class:

  // Car Class

public class Car
{
// begin class

//InventoryCar class has 5 fields
String Name; // Name of Car
float price; // price of Car
int itemno; // item number of Car
int nstock; // how many units in stock
int CarCount; // Car counter for array
float value; // value for single Car inventory
float totalValue; // value for entire inventory
float runningTotal = 0;

//Car class constructor
public Car()

// 4 fields need to be set up
{
Name = "";
price = 0;
itemno = 0;
nstock = 0;
CarCount = 0;
value = 0;
totalValue = 0;
}

// set values
public void setName(String CarName)
{
Name = CarName;
}
public void setPrice(float CarPrice)
{
price = CarPrice;
}
public void setItemno(int CarItemno)
{
itemno = CarItemno;
}
public void setNstock(int CarStock)
{
nstock = CarStock;
}
public void setValue(float CarValue)
{
value = CarValue;
}
public void setCarCount(int Count)
{
CarCount = Count;
}
public void setTotalValue(float invValue)
{
totalValue = invValue;
}

// return values
public String getName()
{
return (Name);
}
public float getPrice()
{
return (price);
}
public int getItemno()
{
return (itemno);
}
public int getNstock()
{
return (nstock);
}


// returns indivudual inventory value for a Car
public float getValue()
{
return(price * nstock);
}

// returns total inventory value for all Cars
public float getTotalValue()
{
return (totalValue += Car[CarCount].getValue());
}


}// end class 
  

Here are the errors I receive:

.\Car.java:89: cannot find symbol
symbol : variable Car
location: class Car
return (totalValue += Car[CarCount].getValue());
^
.\Car.java:89: inconvertible types
found : <nulltype>
required: float
return (totalValue += Car[CarCount].getValue());

Do I need to rewrite the whole program?

[Janeice DelVecchio]

You don't need to rewrite the whole program...

Your syntax is a little off here....

// returns total inventory value for all Cars   
public float getTotalValue()     // if you tell Java here you want to return a float, then the value you're returning needs to BE a float.... 
{   
return (totalValue += Car[CarCount].getValue());   // the syntax here is wrong... there is no Car[] array available to this method.... that's why this is returning a null
}   
  
  
}// end class    
    

Hope that helps!
Janeice

[EDIT] fixed a couple errors.... I misunderstood what you were trying to return....

[John de Michele]

Kevin:

Just a couple of style issues: variable names should begin with a lowercase, so:

Car car = new Car(); //preferred

instead of:

Car Car = new Car(); //not standard

You probably should eliminate lines 14-18, since line 35 will blow away that object.

John.