Less Crappy runtime Enum

java

class EnumValues {
  private final Set<String> values;
  
  public EnumValues(String[] vals) {
    values = new TreeSet<String>();
    values.addAll(vals);
  }
  
  public boolean isAllowed(String val) {
    return values.contains(val);
  }
}

class EnumObject() {
  private String value;
  private final EnumValues values;
  
  public EnumObject(EnumValues vals) {
    values = vals;
    value = vals.iterator().next();
  }
  
  public boolean setValue(String val) {
    if (values.isAllowed(val)) {
      value = val;
      return true;
    }
    return false;
  }
  
  public String getValue() {
    return value;
  }
}

public stativ void main(String[] args) {
  EnumValues e1 = new EnumValues(new String[] {"1A", "2A", "3A"});
  EnumValues e2 = new EnumValues(new String[] {"1B", "2B", "3B"});
  
  EnumObject o1 = new EnumObject(e1);
  EnumObject o2 = new EnumObject(e2);
  
  System.out.println(o1.setValue("1A")); //true
  System.out.println(o1.setValue("2B")); //false
}