Java Programming

Hey and thanks for any help in advance. I am having a trouble finding an algorithm to make fair teams. Basically each "Gamer" has a score from 0-1000. I want to take a group of players in the lobby Vector and add them to the team Vectors so that the teams are as fair as possible. By fair i mean that the combined GamerScores for each of the Team vectors will be as close to equal as they can be. I dont expect anyone to code the makeFairTeams() method for me but maybe just an explanation of how it could be done. I made example classes of Gamer and a Test program. In my example i only have 5 Gamers but there could be hundreds so i want a functional way to put the players into the team vectors fairly.

/*
	This is a cutdown driver program.
	I have a lobby class that handles adding removing and making teams.
*/

import java.util.Vector;

public class FairTeams
{
	//The Teams...
	Vector<Gamer> team1= new Vector<Gamer>();
	Vector<Gamer> team2= new Vector<Gamer>();
	
	//The Players Lobby
	Vector<Gamer> playersInLobby= new Vector<Gamer>();
	
	//The Players and their rating.
	Gamer haloPlayer= new Gamer(400);
	Gamer simsPlayer= new Gamer(700);
	Gamer cod4Player= new Gamer(999);
	Gamer mistPlayer= new Gamer(633);
	Gamer leetPlayer= new Gamer(555);
	
	public FairTeams()
	{
		//All the players are in the lobby
		playersInLobby.add(haloPlayer);
		playersInLobby.add(simsPlayer);
		playersInLobby.add(cod4Player);
		playersInLobby.add(mistPlayer);
		playersInLobby.add(leetPlayer);
		
		/*Now I want to take all the players in the Lobby and make
		/    fair teams based on their rating. 
		/	  By making Fair Teams I mean adding them to the team vectors
		/    so they have the closest possible total score.
		*/		
		makeFairTeams();
	}
	
	public void makeFairTeams()
	{
		//No idea.
	}
	public static void main(String[] args)
	{
		FairTeams FT= new FairTeams();
	}
}

The Gamer Class

/*This is my Gamer Class torn down to only the 
	essentials needed for my problem. 
*/


public class GamerExample
{
	//gamerScore is a positive Integer <=1000.
	private int gamerScore;
	private boolean inTeam;
	
	public GamerExample()
	{
		gamerScore=0;
		inTeam=false;
	}
	
	//Constructor with score peram.
	public GamerExample(int gS)
	{
		if(gS>=0 && gS<=1000)
			gamerScore=gS;
		else{
			gamerScore=0;
			inTeam=false;
		}			
	}
	
	//Sets gamerScore if peram is valid.
	public void setGamerScore(int gS)
	{
		if(gS>=0 && gS<=1000)
			gamerScore=gS;
	}
	public int getGamerScore()
	{
		return(gamerScore);
	}
	
	
	//Sets Team status.True=in a team
	public void setTeamStatus(boolean b)
	{
		inTeam=b;
	}
	public boolean getTeamStatus()
	{
		return(inTeam);
	}
}

Again my problem is trying to find a functional way to put the "Gamers" into the team vectors so the total "GamerScore" for each team vector is as equal as possible. I tried to make this as clear as possible and thanks for any help.