Class PondLife

java.lang.Object

PondLife

public class PondLife
extends java.lang.Object

The PondLife Java application runs a simple simulation that models the fish and weeds in a pond.

The simulation is currently set up to use these values:

• Number of weeds in the pond: 2000
• Initial size of each weed: 15 ounces
• Growth rate of weeds: 2.5 ounces/week
• Initial number of fish in the pond: 300
• Fish size: 50 ounces
• A fish must eat 0.5 times its size during one week, or it will die.
• Average number of weeds nibbled by a fish over a week: 30
• At the end of each week, some fish have babies. The total number of new fish born is the current number of fish times the 0.05 (rounded down to an integer).
• Number of weeks to simulate: 38

Java Source Code for this class: http://www.cs.colorado.edu/~main/applications/PondLife.java

See Also:

Organism, Plant, Herbivore

Field Summary

Fields

Modifier and Type	Field and Description
static int	AVERAGE_NIBBLES
static double	BIRTH_RATE
static double	FISH_SIZE
static double	FRACTION
static int	INIT_FISH
static int	MANY_WEEDS
static int	MANY_WEEKS
static double	WEED_RATE
static double	WEED_SIZE

Constructor Summary

Constructors

Constructor and Description
PondLife()

Method Summary

Modifier and Type	Method and Description
static void	main(java.lang.String[] args) Run the simulation, using the values indicated in the documentation.
static void	pondWeek(java.util.Vector<Herbivore> fish, java.util.Vector<Plant> weeds) Simulate one week of life in the pond, using the values indicated in the documentation.
static <T extends Organism> double	totalMass(java.util.Vector<T> organisms) Calculate the total mass of a collection of Organisms.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MANY_WEEDS

public static final int MANY_WEEDS

See Also:

Constant Field Values

WEED_SIZE

public static final double WEED_SIZE

See Also:

Constant Field Values

WEED_RATE

public static final double WEED_RATE

See Also:

Constant Field Values

INIT_FISH

public static final int INIT_FISH

See Also:

Constant Field Values

FISH_SIZE

public static final double FISH_SIZE

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Constant Field Values

FRACTION

public static final double FRACTION

See Also:

Constant Field Values

AVERAGE_NIBBLES

public static final int AVERAGE_NIBBLES

See Also:

Constant Field Values

BIRTH_RATE

public static final double BIRTH_RATE

See Also:

Constant Field Values

MANY_WEEKS

public static final int MANY_WEEKS

See Also:

Constant Field Values

Constructor Detail

PondLife

public PondLife()

Method Detail

main

public static void main(java.lang.String[] args)

Run the simulation, using the values indicated in the documentation.

Parameters:

args - not used in this implementation

pondWeek

public static void pondWeek(java.util.Vector<Herbivore> fish,
                            java.util.Vector<Plant> weeds)

Simulate one week of life in the pond, using the values indicated in the documentation.

Parameters:

fish - Vector of fish that are in the pond at the start of the week

weeds - Vector of weeds that are in the pond at the start of the week

totalMass

public static <T extends Organism> double totalMass(java.util.Vector<T> organisms)

Calculate the total mass of a collection of Organisms.

Type Parameters:

T - component type of the elements in the organisms Vector Precondition: Every object in organisms is an Organism.

Parameters:

organisms - a Vector of Organism objects

Returns:

the total mass of all the objects in Organism (in ounces).