Question

Java

Part 1 In this section we'll build a small class together, useful for managing a gift card balance. This class will keep track of the total balance and will allow for a starting total, deductions, and a balance report. To manage such details, we'll need a class-level (or instance) variable to store the balance, as well as a few methods to implement the actions mentioned above. Download GiftCard.java and look at the main method. Download the driver GiftCard.java. Add a class-level variable to track the balance at the top of the file. Should this variable be a char? A double? Add a method void setBalance (double newBalance) that resets the balance. Consider making this function fail on negative input Add a deduct(double amount) method that subtracts from the balance Consider making this function fail on a negative balance Add a report() method that prints out the balance remaining on the gift card.

template

public class GiftCard
{
    // Instance Variables
    // TODO: balance

    // Constructors

    /**
     * GiftCard(double initialBalance)
     * 
     * Initialize a GiftCard object with a pre-defined amount of money.
     * 
     * @param initialBalance    double  The desired starting balance
     */
    public GiftCard(double initialBalance) {
        setBalance(initialBalance);
    }

    /**
     * GiftCard()
     * 
     * Initialize a GiftCard object with a balance of $0.00.
     */
    public GiftCard() {}

    // Instance Methods
    /**
     * setBalance
     * 
     * This should set the balance of the gift card to newBalance.
     * The balance should be set to zero and complain if the newbalance is less than
     * zero.
     * 
     * @param newBalance    double  The target balance.
     */
    public void setBalance(double newBalance) {
        // TODO: fill in this method
    }

    /**
     * deduct
     * 
     * This should reduce the balance of the gift card by amount. If the amount is 
     * negative, complain and leave the balance unchanged. If the new balance is
     * negative, complain and leave the balance unchanged.
     * 
     * @param newBalance    double  The target balance.
     */
    public void deduct(double amount) {
        // TODO: fill in this method
    }

    /**
     * report
     * 
     * Print the current balance on the card. 
     */
    public void report() {
        // TODO: fill in this method
    }

    // Driver
    public static void main (String[] args) {
        GiftCard card0 = new GiftCard();
        card0.setBalance(12.00);
        card0.report(); // Should print $12.00
        card0.deduct(25); // Should complain
        card0.report(); // Should print $12.00
        card0.deduct(2.50);
        card0.report(); // Should print $9.50

        GiftCard card1 = new GiftCard(40);
        card1.report(); // Should print $40.00
        card0.report(); // Should Print $9.50
        card1.deduct(20);
        card1.deduct(-20); // Should complain
        card1.report(); // Should print $20.00

        GiftCard card2 = new GiftCard(-20.05); // Should complain
        card2.report(); // Should print $0.00
        card2.setBalance(15); 
        card2.report(); // Should print $15.00
        card1.report(); // Should print $20.00
        card0.report(); // SHould print $9.50
    }

}

Answer 1

public class GiftCard

{
double balance;

public void set Balance(double newBal)

{
if (newBal < 0)
{
System.out.println("ERROR : Balance should not be negetive");
}
else
{

balance = newBal;
}
}

public void deduct(double amount)
{
if(amount < 0)
{
System.out.println("ERROR : Amount should not be negetive");
}
else
{

balance = balance - amount;
}

}

public void report()
{
System.out.print(" "+balance+"\n");
}

public void resetToZero()
{
balance = 0;
}

public static void main(String args[])
{
GiftCard card1 = new GiftCard();

card1.setBalance(50);

System.out.print("card1 is :");
card1.report();

GiftCard card2 = new GiftCard();

card2.setBalance(100);
System.out.print("card2 is :");
card2.report();

card2.deduct(50);
System.out.print("After deducting 50, card2 is :");
card2.report();
}

}

Output:

Output JavaApplication3 (run) DD run card1 is 50.0 card2 is: 100.0 After deducting 50, car d2 is 50.0 BUILD SUCCESSFUL (total time: 0 seconds)

Please upvote, as i have given the exact answer as asked in question. Still in case of any concerns in code, let me know in comments. Thanks!