(a) Writing a Part class (50 marks)
ABC Bicycle Parts specializes in supplying various bicycle parts for the Rali Bicycles. You are
required to write a class named Part to keep track of stock-level for the various parts. This class should
provide the following methods to support the specified operations
int getStockLevel() // to return the current stock level
void replenish(int qty) // to add to the stock level the qty specified
double supply(int qty) // to work out and return the cost of supplying
// specified qty if stock available and -1.0 otherwise.
This class should have instance variables (data members) to store the ID, name, stock-level and unit-
price and a constructor taking values for all of the instance variables. This class should provide
accessors for all the instance variables. You are expected to test your Part class with the TestPart class
below.
COSC2081 – 2009A – Assignment 3
- 2 -
Test class
public class TestPart{
public static void main(String args[]) {
// Part p122 has unit-price of 0.10 and current level = 5000
Part part = new Part("p122", "Chain", 5000, 0.10);
part.replenish(1000); // replenishing stock by 1000 parts
part.replenish(500); // replenishing stock by 500 parts
for (int i=0; i<2; i++){
int qty = 6000; // attempting to supply 6000 parts
double amount = part.supply(qty);
if ( amount > 0 )
System.out.println(part.getID() +
" "+ qty +" supplied. " + " cost = " + amount);
else
System.out.println(part.getID() +
" "+ qty +" items not available. ");
System.out.println("Available qty = " +
part.getStockLevel());
}
}
}
Expected Output
p122 6000 supplied. cost = 600.0
Available qty = 500
p122 6000 items not available.
Available qty = 500
Attempt to supply failed COSC2081 – 2009A – Assignment 3
- 3 -
(b) Using the Part class (50 marks)
(i) Declare an array that can store the references of up to 5 Part objects constructed with the data (ID,
name, stock-level and unit-price) below.
p122, Chain, 48, 12.5
p123, Chain Guard, 73, 22.0
p124, Crank, 400, 11.5
p125, Pedal, 38, 6.5
p126, Handlebar, 123, 9.50
(ii) Now allow the users to either replenish or supply parts repeatedly. If the user wants to replenish,
the letter R should be followed by ID and quantity. If the user wants to supply the letter S should
be followed by ID and quantity. If a nonexistent ID is entered, display an appropriate error
message. Below is sample input and output: The underlined text is user input.
Please enter either S (supply) or R (replenish) followed by ID and quantity.
R p122 10
New Stock-level for p122 (Chain) is 58
S p125 20
New Stock-level for p125 (Pedal) is 18
S p905 20
No item found with ID p905
R p122 30
New Stock-level for p122 (Chain) is 88
Empty String (to terminate)
(iii) Display the final stock level for all the parts.
(dốt anh văn:P)