package org.mitre.synthea.modules;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * Generator creates a population by running the generic modules each timestep per Person.
 */
public class Generator {

	public long ONE_HUNDRED_YEARS = 100l * TimeUnit.DAYS.toMillis(365);
	public List<Person> people;
	public int numberOfPeople;
	public long seed;
	private Random random;
	public long timestep;
	
	public Generator(int people)
	{
		init(people, System.currentTimeMillis());
	}
	
	public Generator(int people, long seed)
	{
		init(people, seed);
	}
	
	private void init(int people, long seed)
	{
		this.people = new ArrayList<Person>();
		this.numberOfPeople = people;
		this.seed = seed;
		this.random = new Random(seed);
		this.timestep = 1000 * 60 * 60 * 24 * 7;
	}
	
	public void run()
	{
		long stop = System.currentTimeMillis();
		for(int i=0; i < numberOfPeople; i++)
		{
			List<Module> modules = Module.getModules();
			
			long start = stop - (long)(ONE_HUNDRED_YEARS * random.nextDouble());
//			System.out.format("Born : %s\n", Instant.ofEpochMilli(start).toString());
			Person person = new Person(System.currentTimeMillis());
			person.attributes.put(Person.BIRTHDATE, start);
			person.events.create(start, Event.BIRTH, "Generator.run", true);
			person.attributes.put(Person.NAME, "John Doe");
			person.attributes.put(Person.SOCIOECONOMIC_CATEGORY, "Middle"); // High Middle Low
			person.attributes.put(Person.RACE, "White"); // "White", "Native" (Native American), "Hispanic", "Black", "Asian", and "Other"
			person.attributes.put(Person.GENDER, "M");
			people.add(person);
			
			long time = start;
			while(person.alive(time) && time < stop)
			{
				Iterator<Module> iter = modules.iterator();
				while(iter.hasNext())
				{
					Module module = iter.next();
					System.out.format("Processing module %s\n", module.name);
					if(module.process(person, time))
					{
						System.out.format("Removing module %s\n", module.name);
						iter.remove(); // this module has completed/terminated.
					}
				}
				time += timestep;
			}
			String deceased = person.alive(time) ? "" : "DECEASED";
			System.out.format("%d -- %s (%d y/o) %s\n", i, person.attributes.get(Person.NAME), person.ageInYears(stop), deceased);
		}
	}
	
}

package org.mitre.synthea.modules;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * Generator creates a population by running the generic modules each timestep per Person.
 */
public class Generator {

	public long ONE_HUNDRED_YEARS = 100l * TimeUnit.DAYS.toMillis(365);
	public List<Person> people;
	public int numberOfPeople;
	public long seed;
	private Random random;
	public long timestep;
	
	public Generator(int people)
	{
		init(people, System.currentTimeMillis());
	}
	
	public Generator(int people, long seed)
	{
		init(people, seed);
	}
	
	private void init(int people, long seed)
	{
		this.people = new ArrayList<Person>();
		this.numberOfPeople = people;
		this.seed = seed;
		this.random = new Random(seed);
		this.timestep = 1000 * 60 * 60 * 24 * 7;
	}
	
	public void run()
	{
		long stop = System.currentTimeMillis();
		for(int i=0; i < numberOfPeople; i++)
		{
			List<Module> modules = Module.getModules();
			
			long start = stop - (long)(ONE_HUNDRED_YEARS * random.nextDouble());
//			System.out.format("Born : %s\n", Instant.ofEpochMilli(start).toString());
			Person person = new Person(System.currentTimeMillis());
			person.attributes.put(Person.BIRTHDATE, start);
			person.events.create(start, Event.BIRTH, "Generator.run", true);
			person.attributes.put(Person.NAME, "John Doe");
			person.attributes.put(Person.SOCIOECONOMIC_CATEGORY, "Middle"); // High Middle Low
			person.attributes.put(Person.RACE, "White"); // "White", "Native" (Native American), "Hispanic", "Black", "Asian", and "Other"
			String gender = (random.nextBoolean()) ? "M" : "F";
			person.attributes.put(Person.GENDER, gender);
			people.add(person);
			
			long time = start;
			while(person.alive(time) && time < stop)
			{
				Iterator<Module> iter = modules.iterator();
				while(iter.hasNext())
				{
					Module module = iter.next();
					System.out.format("Processing module %s\n", module.name);
					if(module.process(person, time))
					{
						System.out.format("Removing module %s\n", module.name);
						iter.remove(); // this module has completed/terminated.
					}
				}
				time += timestep;
			}
			String deceased = person.alive(time) ? "" : "DECEASED";
			System.out.format("%d -- %s (%d y/o) %s\n", i, person.attributes.get(Person.NAME), person.ageInYears(stop), deceased);
		}
	}
	
}

Switch back and forth between genders.