Problem B Now we are going to use the design pattern for collecting objects. We are going to create two classes, a class AmazonOrder that models Amazon orders and a class Item that models items in Amazon orders. An item has a name and a price, and the name is unique. The Item class has a constructor that takes name and price, in that order. The class also has getters and setters for the instance variables. This is the design pattern for managing properties of objects. The setName() method should do nothing if the parameter is the empty string, and the setPrice() method should do nothing if the parameter is not positive. The class also has a toString() method that returns a string representation for the item in the format “Item[Name:iPad,Price:399.99]”. For simplicity, we assume an Amazon order can have at most 5 items, and class AmazonOrder has two instance variables, an array of Item with a length of 5 and an integer numOfItems to keep track of the number of items in the order. Provide a constructor that takes no parameters to initialize the two instance variables. Use a constant for the array length 5. The class has five public methods and one private method: • public void add(Item item) Adds the specified item to the end of this order. No effect if the item is in this order already or this order has 5 items already. • public void remove(Item item) Removes the specified item from this order and maintains the order of all remaining items. No effect if the item is not in this order. • public double totalCost() Finds the total cost of this order and returns 0 if this order has no items. • public Item lastMostExpensive() Finds the last most expensive item of this order and returns null if this order has no items. • Public String toString() Gets a string representation for this order in the format “[Item[...], Item[...], . . ., Item[...]]”, where each Item[...] is the string returned by method toString() of an item in this order. Do not use an if statement inside the for loop. • private int indexOf (Item item) Gets the index of item in this order and returns NOT_FOUND (-1) if item is not in this order. Note: Call the private method indexOf() inside methods add() and remove(). If the return value is NOT_FOUND, the item is not in this order.
Problem B Now we are going to use the design pattern for collecting objects. We are going to create two classes, a class AmazonOrder that models Amazon orders and a class Item that models items in Amazon orders. An item has a name and a price, and the name is unique. The Item class has a constructor that takes name and price, in that order. The class also has getters and setters for the instance variables. This is the design pattern for managing properties of objects. The setName() method should do nothing if the parameter is the empty string, and the setPrice() method should do nothing if the parameter is not positive. The class also has a toString() method that returns a string representation for the item in the format “Item[Name:iPad,Price:399.99]”. For simplicity, we assume an Amazon order can have at most 5 items, and class AmazonOrder has two instance variables, an array of Item with a length of 5 and an integer numOfItems to keep track of the number of items in the order. Provide a constructor that takes no parameters to initialize the two instance variables. Use a constant for the array length 5. The class has five public methods and one private method: • public void add(Item item) Adds the specified item to the end of this order. No effect if the item is in this order already or this order has 5 items already. • public void remove(Item item) Removes the specified item from this order and maintains the order of all remaining items. No effect if the item is not in this order. • public double totalCost() Finds the total cost of this order and returns 0 if this order has no items. • public Item lastMostExpensive() Finds the last most expensive item of this order and returns null if this order has no items. • Public String toString() Gets a string representation for this order in the format “[Item[...], Item[...], . . ., Item[...]]”, where each Item[...] is the string returned by method toString() of an item in this order. Do not use an if statement inside the for loop. • private int indexOf (Item item) Gets the index of item in this order and returns NOT_FOUND (-1) if item is not in this order. Note: Call the private method indexOf() inside methods add() and remove(). If the return value is NOT_FOUND, the item is not in this order.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Problem B
Now we are going to use the design pattern for collecting objects. We are going to create two
classes, a class AmazonOrder that models Amazon orders and a class Item that models items
in Amazon orders.
An item has a name and a price, and the name is unique. The Item class has a constructor that
takes name and price, in that order. The class also has getters and setters for the instance
variables. This is the design pattern for managing properties of objects. The setName() method
should do nothing if the parameter is the empty string, and the setPrice() method should do
nothing if the parameter is not positive. The class also has a toString() method that returns a
string representation for the item in the format “Item[Name:iPad,Price:399.99]”.
For simplicity, we assume an Amazon order can have at most 5 items, and class
AmazonOrder has two instance variables, an array of Item with a length of 5 and an integer
numOfItems to keep track of the number of items in the order. Provide a constructor that takes
no parameters to initialize the two instance variables.
Use a constant for the array length 5.
The class has five public methods and one private method:
• public void add(Item item) Adds the specified item to the end of this order. No
effect if the item is in this order already or this order has 5 items already.
• public void remove(Item item) Removes the specified item from this order and
maintains the order of all remaining items. No effect if the item is not in this order.
• public double totalCost() Finds the total cost of this order and returns 0 if this order
has no items.
• public Item lastMostExpensive() Finds the last most expensive item of this order
and returns null if this order has no items.
• Public String toString() Gets a string representation for this order in the format
“[Item[...], Item[...], . . ., Item[...]]”, where each Item[...] is the string returned by method
toString() of an item in this order. Do not use an if statement inside the for loop.
• private int indexOf (Item item) Gets the index of item in this order and returns
NOT_FOUND (-1) if item is not in this order.
Note: Call the private method indexOf() inside methods add() and remove(). If the return value is
NOT_FOUND, the item is not in this order.
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