Repopulation After the Flood

Subject:    a little program I wrote for playing around with repopulation after the flood
Date:       12 May 2004
Message-ID: had4a0t2v6h2fq1o4dglraet2q0m0003d1@4ax.com

From Adam's creation to the birth of Seth   130 years
Then to the birth of Enosh                  105 years
To the birth of Kenan                        90 years
To the birth of Mahalalel                    70 years
To the birth of Jared                        65 years
To the birth of Enoch                       162 years
To the birth of Methuselah                   65 years
To the birth of Lamech                      187 years
To the birth of Noah                        182 years
To the Flood                                600 years

***  begin source code ***

// Person.java

package floodworld;

import java.util.Random;
import java.util.Vector;

public class Person {

	private Random randomNumberGenerator = new Random();
	private boolean isFemale;
	private boolean isPregnant = false;
	private int currentAge = 0;
	private int weeksOfCurrentYear = 0;
	private int weeksOfGestation = 0;
	private int menstrualCycleWeek = 0;
	private int ageOfDeath = -1;
	private int weeksSinceGivingBirth = 6;
	
	public Person () {
		// 70% chance of being female
		isFemale = (randomNumberGenerator.nextInt(100) < 54);
	}
	
	public Person (boolean female) {
		isFemale = female;
	}
	
	public void setCurrentAge(int age) {
		currentAge = age;
	}
	
	public void setAgeOfDeath(int age) {
		ageOfDeath = age;
	}
	
	public void haveSex() {
		if(!isFemale || (isFemale && (currentAge < 13 || currentAge > 45 || isPregnant || menstrualCycleWeek == 3))) {
			return;
		} else {
			if(weeksSinceGivingBirth < 6) {
				return;
			}
			// female between the ages of 13 & 45 who is not pregnant and not having their period
			// 50% chance of getting pregnant
			if(randomNumberGenerator.nextInt(100) < 30) {
				isPregnant = true;
				menstrualCycleWeek = 0;
			}
		}
	}

	public boolean isGirl() {
		return (isFemale && currentAge < 13);
	}

	public boolean isBoy() {
		return (!isFemale && currentAge < 13);
	}

	public boolean isWoman() {
		return (isFemale && (currentAge > 13 && currentAge < 66));
	}

	public boolean isMan() {
		return (!isFemale && (currentAge > 13 && currentAge < 66));
	}

	public boolean isElderly() {
		return (currentAge > 65);
	}
	
	public void ageByOneWeek() {
		if(isPregnant) {
			weeksOfGestation++;
		}
		if(weeksSinceGivingBirth < 6) {
			weeksSinceGivingBirth++;
		}
		if(isFemale && currentAge > 12 && currentAge < 45 && !isPregnant) {
			if(menstrualCycleWeek < 3) {
				menstrualCycleWeek++;
			} else {
				 menstrualCycleWeek = 0;
			}
		}
		weeksOfCurrentYear++;
		if(weeksOfCurrentYear > 52) {
			weeksOfCurrentYear = 0;
			currentAge++;
		}
	}
	
	public boolean die() {
		if(ageOfDeath != -1) {
			return (currentAge == ageOfDeath);
		}
		if(currentAge < 85) {
			return (randomNumberGenerator.nextInt(1000) == 76);
		}
		if(currentAge > 85 && currentAge < 100) {
			return (randomNumberGenerator.nextInt(700) == 45);
		}
		if(currentAge > 99 && currentAge < 121) {
			return (randomNumberGenerator.nextInt(400) == 102);
		} 		
		if(currentAge > 120) {
			return (randomNumberGenerator.nextBoolean());
		} else {
			 return false;
		}
	}
	
	public Vector giveBirth() {
		Vector babies = new Vector();
		if(isPregnant && weeksOfGestation > 39) {
			if(randomNumberGenerator.nextInt(100) < 98) {
				babies.add(new Person());
			} else {
				// twins
				babies.add(new Person());
				babies.add(new Person());
			}
			isPregnant = false;
			weeksOfGestation = 0;
			weeksSinceGivingBirth = 0;
		}
		return babies;
	}
	
	public boolean isFemale() {
		return isFemale;
	}
	
	public int getAge() {
		return currentAge;
	}
	
	public boolean isPregnant() {
		return isPregnant;
	}
	
	public String stats() {
		return currentAge + " year old " + (isPregnant ? "pregnant " : "") + (isFemale ? "female" : "male");
	}
}



// Civilization.java

package floodworld;

import java.util.HashSet;
import java.util.Iterator;

public class Civilization {
	public static void main(String[] args) {
		
		int currentWeek = 0;
		int currentYear = 1;
		int currentPopulation = 8;
		
		HashSet men = new HashSet();
		HashSet women = new HashSet();
		HashSet boys = new HashSet();
		HashSet girls = new HashSet();
		HashSet elderly = new HashSet();
		HashSet deadPeople = new HashSet();
		
		// starter population
		Person noah = new Person(false);
		Person noahsWife = new Person(true);
		Person shem = new Person(false);
		Person shemsWife = new Person(true);
		Person ham = new Person(false);
		Person hamsWife = new Person(true);
		Person japheth = new Person(false);
		Person japhethsWife = new Person(true);
		
		noah.setCurrentAge(418);
		noah.setAgeOfDeath(768);
		noahsWife.setCurrentAge(100);
		shem.setCurrentAge(98);
		shem.setAgeOfDeath(550);
		shemsWife.setCurrentAge(30);
		ham.setCurrentAge(88);
		ham.setAgeOfDeath(550);
		hamsWife.setCurrentAge(30);
		japheth.setCurrentAge(108);
		japheth.setAgeOfDeath(550);
		japhethsWife.setCurrentAge(30);
		
		elderly.add(noah);
		elderly.add(noahsWife);
		elderly.add(shem);
		elderly.add(ham);
		elderly.add(japheth);
		
		women.add(shemsWife);
		women.add(hamsWife);
		women.add(japhethsWife);
		
		while(currentYear < 181) {
			int births = 0;
			int deaths = 0;
			int pregnantWomen = 0;
			
			// boys loop
			for(Iterator boysIter = boys.iterator(); boysIter.hasNext();) {
				Person boy = (Person) boysIter.next();
				boy.ageByOneWeek();
				if(boy.die()) {
					deaths++;
					deadPeople.add(boy);
					continue;
				}
				if(boy.isMan()) {
					men.add(boy);
				}
			}
			// girls loop
			for (Iterator girlsIter = girls.iterator(); girlsIter.hasNext();) {
				Person girl = (Person)girlsIter.next();
				girl.ageByOneWeek();
				if(girl.die()) {
					deaths++;
					deadPeople.add(girl);
					continue;
				}
				if(girl.isWoman()) {
					women.add(girl);
				}
			}
			// women loop
			for (Iterator womenIter = women.iterator(); womenIter.hasNext();) {
				Person woman = (Person)womenIter.next();
				if(girls.contains(woman)) {
					girls.remove(woman);
					continue;
				}
				woman.haveSex();
				woman.ageByOneWeek();
				for (Iterator babiesIter = woman.giveBirth().iterator(); babiesIter.hasNext();) {
					Person baby = (Person)babiesIter.next();
					births++;
					if(baby.isGirl()) {
						girls.add(baby);
					} else {
						boys.add(baby);
					}
				}
				if(woman.isPregnant()) {
					pregnantWomen++;
				}
				if(woman.die()) {
					deaths++;
					deadPeople.add(woman);
					continue;
				}
				if(woman.isElderly()) {
					elderly.add(woman);
				}
			}
			// men loop
			for (Iterator menIter = men.iterator(); menIter.hasNext();) {
				Person man = (Person) menIter.next();
				if(boys.contains(man)) {
					boys.remove(man);
					continue;
				}
				man.ageByOneWeek();
				if(man.die()) {
					deaths++;
					deadPeople.add(man);
					continue;
				}
				if(man.isElderly()) {
					elderly.add(man);
				}
			}
			// elderly loop
			for (Iterator elderlyIter = elderly.iterator(); elderlyIter.hasNext();) {
				Person oldPerson = (Person)elderlyIter.next();
				if(men.contains(oldPerson)) {
					men.remove(oldPerson);
					continue;
				}
				if(women.contains(oldPerson)) {
					women.remove(oldPerson);
					continue;
				}
				oldPerson.ageByOneWeek();
				if (oldPerson.die()) {
					deaths++;
					deadPeople.add(oldPerson);
					continue;
				}
			}

			// bring out the dead
			for (Iterator deadIter = deadPeople.iterator(); deadIter.hasNext();) {
				Person deadPerson = (Person)deadIter.next();
				boys.remove(deadPerson);
				girls.remove(deadPerson);
				men.remove(deadPerson);
				women.remove(deadPerson);
				elderly.remove(deadPerson);
			}
			
			// tally
			currentWeek++;
			if(currentWeek == 53) {
				currentYear++;
				currentWeek = 0;
				System.out.println(currentYear);
			}
			if(currentYear >= 180) {
				System.out.println("Year " + currentYear + "/Week " + currentWeek + ": Boys (under 12): " + boys.size() + " / Girls (under 12): " + girls.size() + " / Men (13-65): " + men.size() + " / Women (13-65): " + women.size() + " / Elderly (66+): " + elderly.size());
				System.out.println("Births: " + births);
				System.out.println("Deaths: " + deaths);
				System.out.println("Pregnant Women: " + pregnantWomen);
				int totalPopulation = (boys.size() + girls.size() + men.size() + women.size() + elderly.size());
				int totalChildren = (boys.size() + girls.size());
				int totalAdults = (men.size() + women.size() + elderly.size());
				System.out.println("Total Population: " + totalPopulation + " / "  + totalChildren  + " children, " + totalAdults + " adults");
			}
		}
	}
}