JAVA 经典枚举类写法

  /** 消息类型（来源） */
  public enum MessageType {
    // 枚举实例
    POLICY("policy", "政策模块"),
    MAILBOX("mailbox", "信箱模块"),
    SCORE("score", "打分模块");
   
    // 字段
    private String type;
    private String typeName;

    /** 构造方法 */
    private MessageType(String type, String typeName) {
      this.type = type;
      this.typeName = typeName;
    }
    
    /** 通过类型获取类型名称 */
    public static String getTypeName(String type) {
      for (MessageType m : MessageType.values()) {
        if (m.getType() == type) {
          return m.typeName;
        }
      }
      return "";
    }
     
    /**     SETER AND GETER  */
    public String getType() {
      return this.type;
    }

    public void setType(String type) {
      this.type = type;
    }

    public String getTypeName() {
      return this.typeName;
    }

    public void setTypeName(String typeName) {
      this.typeName = typeName;
    }
  };