Program plan: The variables used in the program are given below: item: An instance variable of type Item that represents the item in the room. hasItem: A boolean variable that is true if the room has an item and false otherwise. The methods used in the program are as follows: Room(String description): A constructor method that takes a String parameter representing the description of the room, creates a new instance of the Room class, and initializes the instance variables. addItem(Item item): A method that takes an Item object as a parameter and adds it to the room if there is no existing item in the room. removeItem(): A method that removes the item from the room if there is one and returns it. If there is no item, it returns null. hasItem(): A method that returns true if the room has an item and false otherwise. getItemDescription(): A method that returns a String description of the item in the room or "none" if there is no item. getDescription(): An overridden method from the Entity class that returns the description of the room along with the description of the item, if there is one. Program Description: To extend the project so that a room can contain a single item.

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Chapter 8, Problem 20E

Program Plan Intro

Program plan:

The variables used in the program are given below:

item: An instance variable of type Item that represents the item in the room.

hasItem: A boolean variable that is true if the room has an item and false otherwise.

The methods used in the program are as follows:

Room(String description): A constructor method that takes a String parameter representing the description of the room, creates a new instance of the Room class, and initializes the instance variables.

addItem(Item item): A method that takes an Item object as a parameter and adds it to the room if there is no existing item in the room.

removeItem(): A method that removes the item from the room if there is one and returns it. If there is no item, it returns null.

hasItem(): A method that returns true if the room has an item and false otherwise.

getItemDescription(): A method that returns a String description of the item in the room or "none" if there is no item.

getDescription(): An overridden method from the Entity class that returns the description of the room along with the description of the item, if there is one.

Program Description:
To extend the project so that a room can contain a single item.

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