Java:这个数据结构叫什么?

enum

/**
 * Don't use caps for a "class" name :)
 */
public enum Motive {
  GET_PLAYER,
  GET_FLAG;

}

/**
 * Don't use caps for a "class" name :)
 */
public enum Motive {
  GET_PLAYER("Assessination Quest"),
  GET_FLAG("Capture the Flag PvP");

  private Motive(final String desc) {
     this.description = desc;
  }

  public String getDescription() {
    return description;
  }

  private final String description;
}

public final class MyClass {
    private Motive motive;

    public MyClass(final Motive motive) {
        this.motive = motive;
    }  
}

examples doc