Question

UML CLASS DIAGRAM

This is a Design Exercise. You will need to make classes that could be used to stage a battle as described below.

You have been tasked to create a number of items that can be used in an online game. All items can be used on a game character who will have a name, a number of health-points and a bag to hold the items.  

Here are examples of items that can be made:

Item	type of item	effectOnHealth	other info
Widow's Cloak	Armor	+15
Gladiator's Shield	Armor	+8
Rusty Knife	Weapon	-3
Protection Spell	Spell	1	has magic words that can be read
Note from Zelda	Letter	0	says "Beware of the Witch"

Here are examples of characters that can be made:

name	health points
Godwin	30
Marilyn	40

All items can be added to any character's bag and also used on any character. (For instance the Rusty Knife could be used on a character to lower their health by 3 points.)

Armor and weapons can be equipped (worn) and removed. Spells can also be equipped (memorized) which casts a glow around the character and removed (forgotten) which removes the glow. In the future, any time a character equips or removes any item, their appearance will be altered. These methods -- for now -- can just have a body which says either "equipping" or "removing."

Both spells and letters have some text that could be read.  Whenever a spell or letter is used, the text will also be read (displayed). However these items can be read independently from their use on a character.

Build these items using good interface and abstract class design as appropriate. Set the toString() method of the Character class to return a character's name and current health. You should have a good object oriented structure and good method signatures.

To illustrate this, in a driver class, two characters, Godwin and Marilyn are created. They begin by having items added to their bags (both Godwin and Marilyn get a copy of the Note from Zelda). Then the items they have are used on themselves or one another as follows:

This is a sample of how a Driver could work, staging a battle between the defensive Godwin and the offensive Marilyn.

- The Protection Spell is used on Godwin (by Godwin)
- The Rusty Knife is used on Godwin (by Marilyn)
- The Gladiator's Shield is used on Godwin (by Godwin)
- The Rusty Knife is used on Godwin (by Marilyn)

The Driver output could look something like this:

** Godwin and Marilyn add items to their bags.

Note from Zelda added to Godwin (30)
Note from Zelda added to Marilyn (40)
Protection Spell added to Godwin (30)
Widow's Cloak added to Marilyn (40)
Gladiator's Shield added to Godwin (30)
Rusty Knife added to Marilyn (40)

** Godwin and Marilyn battle

Protection Spell used on Godwin (31)
Reading Spell,'Goddess of the day and night, protect me with all your might'

Rusty Knife used on Godwin (28)

Gladiator's Shield used on Godwin (36)

Rusty Knife used on Godwin (33)

You do not need to code a driver, but if there is time it might be a good way to check your design.

Answer 1

UML class diagram
<<Interface>> Driver CHARACTER ITEM + Item: String + Effect_on_health: int + item_type: String getCharacter_Health(): int setCharacterHealth(int Health); int + getitem("@equipping","@removing"): String enum + getspelltext(): String + Character_name: String + Health: int + toString0: String

For the above given scenerio there are 3 classes namely - Item,Driver and Character.Driver class is used as an interface which holds 4 methods or functions which are getCharacter_Health(),setCharacterHealth(),getitem() and getspelltext().

getCharacter_Health() - which displays current health status of the character.

setCharacterHealth() - which displays set health status when the items are used by the character(Godwin,Marilyn). The health status is updated with respect to effect on health of the character.

getitem() - String enum "@equipping" is used when equipping the item and "@removing" is used for removing the items from the character bag.

getspelltext() - Display spell text to the character when the type of the item - 'spell' or 'letter' is invoked by the character.

toString() - Display the output of each methods.