public void addTanks(RiskPlayer player, Land land, int nTank)
{
player.removeTanks(nTank);
land.addTanksOnLand(nTank);
}
public void moveTanks(Land startLand, Land endLand, int nTank)
{
startLand.removeTanksOnLand(nTank);
endLand.addTanksOnLand(nTank);
}