calvin van
Posts: 3
Nickname: calvinvan
Registered: Mar, 2004
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Need help for modify CreditCard program.
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Posted: Jun 9, 2004 12:14 PM
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THIS IS A CreditCard.java
// Excerpted from "Data structures and algorithms in Java,
// by Michael T. Goodrich and Roberto Tamassia"
//
// Modified by Calvin Nguyen
public class CreditCard {
// Instance variables:
private String number;
private String name;
private String bank;
private double balance;
private int limit;
// Constructor:
CreditCard(String no, String nm, String bk, double bal, int lim) {
number = no;
name = nm;
bank = bk;
balance = bal;
limit = lim;
}
// Accessor methods:
public String getNumber() { return number; }
public String getName() { return name; }
public String getBank() { return bank; }
public double getBalance() { return balance; }
public int getLimit() { return limit; }
// Action methods:
public boolean chargeIt(double price) { // Make a charge
if (price + balance > (double) limit)
return false; // There is not enough money left to charge it
balance += price;
return true; // The charge goes through in this case
}
public void makePayment(double payment) { // Make a payment
balance -= payment;
}
public static void printCard(CreditCard c) { // Print a card's information
System.out.println("Number = " + c.getNumber());
System.out.println("Name = " + c.getName());
System.out.println("Bank = " + c.getBank());
System.out.println("Balance = " + c.getBalance()); // Implicit cast
System.out.println("Limit = " + c.getLimit()); // Implicit cast
}
public static void main(String[] args) {
CreditCard wallet[] = new CreditCard[10];
wallet[0] = new CreditCard("5391 0375 9387 5309",
"John Bowman", "California Savings", 0.0, 2500);
wallet[1] = new CreditCard("3485 0399 3395 1954",
"John Bowman", "California Federal", 0.0, 3500);
wallet[2] = new CreditCard("6011 4902 3294 2994",
"John Bowman", "California Finance", 0.0, 5000);
for (int i=1; i<=16; i++) {
wallet[0].chargeIt((double)i);
wallet[1].chargeIt(2.0*i); // implicit cast
wallet[2].chargeIt((double)3*i); // explicit cast
}
for (int i=0; i<3; i++) {
CreditCard.printCard(wallet);
while (wallet.getBalance() > 100.0) {
wallet.makePayment(100.0);
System.out.println("New balance = " + wallet.getBalance());
}
}
}
}
// END
Above is the CreditCard.java program that had written out, but I can't Modify the CreditCard class to do the following:
1. To check that the price argument passed to method chargeIt and the payment argument passed to method mkaePayment are positive.
2. To check a late fee for any payment that is past its due month. You may want to add an instance variable like dueMonth.
3. To include the modifier methods, which allow a user to modify internal variables in a CreditCard class in a controlled manner.
Here is my main() , that I really need help to modify those statement above, many thanks for helping me.
public static void main(String[] args) {
CreditCard wallet[] = new CreditCard[10];
wallet[0] = new CreditCard("5391 0375 9387 5309",
"John Bowman", "California Savings", 0.0, 2500, 6); //6 means June
card1.chargeIt(100.5);
CreditCard.printCard(card1);
card1.chargeIt(-10);
CreditCard.printCard(card1);
card1.makePayment(20.0, 6); // pay $20.0 in June
CreditCard.printCard(card1);
card1.makePayment(-10, 6);
CreditCard.printCard(card1);
card1.makePayment(10.0, 7); // pay $20.0 in July
CreditCard.printCard(card1);
card1.setNumber( "5391 0375 9387 5308");
card1.setName( "Jane Bowman");
card1.setBank( "Chicago Savings");
card1.serLimit(900);
card1.serDueMonth(7);
CrediCard.printCard(card1 );
}
This is the out put that I need to get from the code above:
Number = 5391 0375 9387 5309
Name = John Bowman
Bank = California Savings
Balance = 100.5
Limit = 2500
dueMonth = 6
The price passed to method chargeIt() is not positive.
Number = 5391 0375 9387 5309
Name = John Bowman
Bank = California Savings
Balance = 100.5
Limit = 2500
dueMonth = 6
Number = 5391 0375 9387 5309
Name = John Bowman
Bank = California Savings
Balance = 80.5
Limit = 2500
dueMonth = 6
The payment passed to method chargeIt() is not positive.
Number = 5391 0375 9387 5309
Name = John Bowman
Bank = California Savings
Balance = 100.5
Limit = 2500
dueMonth = 6
The payment was past the due date. A late fee, $25.0, was charged.
Number = 5391 0375 9387 5309
Name = John Bowman
Bank = California Savings
Balance = 95.5
Limit = 2500
dueMonth = 6
Number = 5391 0375 9387 5308
Name = John Bowman
Bank = Chicago Savings
Balance = 1000.0
Limit = 2500
dueMonth = 7
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