// Compares first by number and then by name.
public int compareTo(Team other) {
if (other == null) return -1;
if (other.getNumber() != getNumber()) return getNumber() - other.getNumber();
return getName().compareTo(other.getName());
}
// Checks for equality with the specified team.
private boolean equals(Team team) {
return team.getName().equals(getName()) && team.getNumber() == getNumber();
}