EntityType.java

public enum EntityType {
    Customer("CS"),
    ContactPerson("CP");

    EntityType(String symbol) {
        this.symbol = symbol;
    }
    private String symbol;

    public String getName() {
        return name();
    }
    public String getSymbol() {
        return symbol;
    }
    public static EntityType nameToEntityType(String name) {
        for (EntityType et: EntityType.values()) {
            if (et.getName().equals(name)) {
                return et;
            }
        }
        throw new IllegalArgumentException(name + " cannot be converted to EntityType");
    }
    public static EntityType symbolToEntityType(String symbol) {
        for (EntityType et: EntityType.values()) {
            if (et.symbol.equals(symbol)) {
                return et;
            }
        }
        throw new IllegalArgumentException(symbol + " cannot be converted to EntityType");
    }
}