catfish.txt

卡耐基梅隆大学 SSD课程体系 ssd1 exesice6 答案

English Specification for Catfish class:-


Attributes and behaviors similar to those for AlgaeColony
=========================================================

Constant class attributes:

	ALIVE: Private attribute. 
		Represents status of Catfish that is alive as a String. 
	DEAD: Private attribute. 
		Represents status of Catfish that is dead as a String. 
	SPECIES: Private attribute. 
		Represents species of lifeform as a String. 
	BABY_MAX_ENERGY: Private attribute. 
		Represents maximum energy that can be carried as an integer. 
	BABY_MIN_ENERGY: Private attribute. 
		Represents minimum energy needed to stay alive as an integer. 

Constant instance attributes:

	name: Private attribute. 
		Represents unique name as a String 

Instance attributes: 

	row: Private attribute. 
		Represents row identifying the location as an integer. 
	column: Private attribute. 
		Represents column identifying the location as an integer. 
	deadOrAlive: Private attribute. 
		Represents living status as a String. 
	energy: Private attribute. 
		Represents current energy level as a String. 
	age: Private attribute. 
		Represents age as an integer. 
	simulation: Private attribute. 
		Represents simulation to which the Catfish belongs as an object of Simulation class.
	minEnergy: Private attribute.
		Represents minimum energy needed to survive as an integer.
	maxEnergy: Private attribute.
		Represents maximum energy that can be carried as an integer.

Class attributes: 

	nCatfishCreated: Private attribute.
		Represents number of Catfish created so far as an integer, to help the Simulation object keep track of the total number of Catfish in the simulation.

Behaviors: 

	Constructor: Create an instance of the Catfish class. 
	liveALittle: Live a block of time. 
			Part of the public interface.
	die: Update living status to being dead. 
			Returns nothing. 
			Part of the private interface.
	getRow: Return the row in which Catfish is located as an integer. 
			Part of the public interface.
	getColumn: Return the column in which Catfish is located as an integer. 
			Part of the public interface.
	getAge: Return the age of Catfish as an integer. 
			Part of the public interface.
	getName: Return the unique name identifying the Catfish as a String. 
			Part of the public interface.
	getImage: Return an image representing the Catfish. 
			Part of the public interface.
	getMinEnergy: Return the minimum energy needed to stay alive as an integer. 
			Part of the private interface.
	getMaxEnergy: Return the maximum energy that can be carried as an integer. 
			Part of the private interface.
	getEnergy: Return the current energy level as an integer. 
			Part of the public interface.
	isDead: Return the living status of the Catfish as a boolean. 
			Part of the public interface.
	getDisplayMechanism: Return the mechanism used for displaying the Catfish as a String. 
			Part of the public interface.
	getSpecies: Return the species of the Catfish as a String. 
			Part of the public interface.
	getColor: Return the color of the Catfish as a String. 
			Part of the public interface.
	setEnergy: Set the energy level as specified by the integer value passed as a parameter. 
			Part of the private interface.

Attributes and behaviors specific to Catfish 
===========================================

Instance attribute:

	direction: This private attribute represents the direction in which the Catfish is facing as a String 


Constant class attributes:

	RIGHT: Private attribute.
		Represents the direction of Catfish facing right as a String. 
	LEFT: Private attribute.
		Represents the direction of Catfish facing left as a String.
	UP: Private attribute. 
		Represents the direction of Catfish facing up as a String.
	DOWN: Private attribute.
		Represents the direction of Catfish facing down as a String. 

Behaviors:

	moveToRow: Move the Catfish to the row specified by the integer value passed as a parameter. 
		Returns the row where the Catfish is moved as an integer. 
		Part of the private interface.
	moveToColumn: Move the Catfish to the column specified by the integer value passed as a parameter. 
		Returns the column where the Catfish is moved as an integer. 
		Part of the private interface. 
	isHungry: Check if the current energy level of the Catfish is less than twice the amount needed for survival. 
		Returns a boolean. 
		Part of the private interface.
	getDirection: Check the direction in which the Catfish is facing. 
		Returns a String. 
		Part of the private interface.

	lookForFoodInNeighborhood: Try to locate any AlgaeColony close by. Relinquish some energy in the process. 
				Note that this behavior requires a way to store the neighboring AlgaeColony objects. Your knowledge of Vectors from 2.2.3 Lifecycle of Objects can help you here. 
				Part of the private interface.