HealthState example

Health.java

public enum Health {
    HEALTHY(false, false, false, false),
    INCUBATIOUS(true, false, false, false),
    SICK(true...),
    DEAD(....);

    private boolean infected;
    private boolean sick;
    private boolean immune;
    private boolean dead;

    private Health(boolean infected, boolean sick, boolean immune, boolean dead) {
        this.infected  = infected;
        this.sick = sick;
        this.immune = immune;
        this.dead = dead;
    }

    public boolean isInfected() {
        return infected;
    }

    public boolean isSick() {
        return sick;
    }

    public Health evolve() {
        switch (this) {
           case HEALTHY:
               return computeProbabability..() ? INCUBATIOUS : HEALTHY;
[....]
        }
    }
}