Question

Add appropriate descriptive comments to each line of the code, explaining why the code is in the application.

import java.text.NumberFormat;

public class LineItem implements Cloneable {
private Product product;
private int quantity;
private double total;

public LineItem() {
this.product = new Product();
this.quantity = 0;
this.total = 0;
}

public LineItem(Product product, int quantity) {
this.product = product;
this.quantity = quantity;
}

public void setProduct(Product product) {
this.product = product;
}

public Product getProduct() {
return product;
}

public void setQuantity(int quantity) {
this.quantity = quantity;
}

public int getQuantity() {
return quantity;
}

public double getTotal() {
this.calculateTotal();
return total;
}

private void calculateTotal() {
total = quantity * product.getPrice();
}

public String getFormattedTotal() {
NumberFormat currency = NumberFormat.getCurrencyInstance();
return currency.format(this.getTotal());
}

@Override
public String toString() {
return
"Code: " + product.getCode() + "\n" +
"Description: " + product.getDescription() + "\n" +
"Price: " + product.getFormattedPrice() + "\n" +
"Quantity: " + quantity + "\n" +
"Total: " + this.getFormattedTotal() + "\n";
}
// overrides to stop error message
@Override
public Object clone() throws CloneNotSupportedException
{
LineItem li = (LineItem) super.clone();
Product p = (Product) product.clone();
li.setProduct(p);
return li;

}
}

Answer 1

import java.text.NumberFormat;

// Declaring a class for representing a lineItem
public class LineItem implements Cloneable {

// instance members of class
private Product product;
private int quantity;
private double total;

// Default Constructor
public LineItem() {
this.product = new Product();
this.quantity = 0;
this.total = 0;
}

// Parameterized constructor
public LineItem(Product product, int quantity) {
this.product = product;
this.quantity = quantity;
}

// method to set the product
public void setProduct(Product product) {
this.product = product;
}

// method to get the product
public Product getProduct() {
return product;
}

// method to set the quantity
public void setQuantity(int quantity) {
this.quantity = quantity;
}

// method to get the quantity
public int getQuantity() {
return quantity;
}

// method to calculate total amount from line item
public double getTotal() {
this.calculateTotal();
return total;
}

// this is a private method, which calculates the total
// price for this lineitem and updates it.
private void calculateTotal() {
total = quantity * product.getPrice();
}

// This method is used to get a prettify string representation
// of the line item's cost with currency symbol
public String getFormattedTotal() {
NumberFormat currency = NumberFormat.getCurrencyInstance();
return currency.format(this.getTotal());
}

// This method returns the string representation of the lineItem
// object. It prints the details in proper order.
@Override
public String toString() {
return
"Code: " + product.getCode() + "\n" +
"Description: " + product.getDescription() + "\n" +
"Price: " + product.getFormattedPrice() + "\n" +
"Quantity: " + quantity + "\n" +
"Total: " + this.getFormattedTotal() + "\n";
}

// overrides to stop error message
// Clone method is used to create the exact copy of lineItem object
// along with the instance members
@Override
public Object clone() throws CloneNotSupportedException
{
LineItem li = (LineItem) super.clone();
Product p = (Product) product.clone();
li.setProduct(p);
return li;

}
}