java枚举类型enum的使用实例

来源：互联网发布：vision软件作用编辑：程序博客网时间：2024/04/28 15:02

java枚举类型enum的使用

java中定义常量有两种方法：final关键字和enum枚举。Java中的枚举类型采用关键字enum来定义，从jdk1.5才有的新类型，所有的枚举类型都是继承自Enum类型。要了解枚举类型，建议大家先打开jdk中的Enum类简单读一下，这个类里面定义了很多protected方法，比如构造函数，如果要使用这些方法我们可以把枚举类型定义到当前类中。每个枚举类型，都有自己的名字和顺序，当我们输出一个枚举类型的时候，会输入枚举类型的name，具体可以参考下面的例子。

public enum OperationType {    ADD_KEYWORD("add_keyword@resource", "KEYWORD"),    ADD_START_KEYWORD("add_start_keyword@resource", "KEYWORD"),    ADD_STOP_KEYWORD("add_stop_keyword@resource", "KEYWORD"),    DELETE_KEYWORD("delete_keyword@resource", "KEYWORD"),    ADD_REC_TO_RECYCLE("add_rec_to_recycle@resource", "KEYWORD"),    STOP_KEYWORD("stop_keyword@resource", "KEYWORD"),    STOP_ALL_KEYWORD("stop_all_keyword@resource", "KEYWORD"),    START_KEYWORD("start_keyword@resource", "KEYWORD"),    START_ALL_KEYWORD("start_all_keyword@resource", "KEYWORD"),    BID_KEYWORD("bid_keyword@resource", "KEYWORD"),    MODIFY_BID_KEYWORD("modify_bid_keyword@resource", "KEYWORD"),    MODIFY_ADD_KEYWORD("modify_add_keyword@resource", "KEYWORD"),    MODIFY_SUB_KEYWORD("modify_sub_keyword@resource", "KEYWORD"),    MODIFY_KEYWORD_TAG("modify_keyword_tag@resource", "KEYWORD"),    CANCEL_KEYWORD_TAG("cancel_keyword_tag@resource", "KEYWORD"),    SET_PREFERENTIAL_PRODUCT("set_preferential_product@resource", "KEYWORD"),    CANCEL_PREFERENTIAL_PRODUCT("cancel_preferential_product@resource", "KEYWORD"),    SET_ADMATCH("set_admatch@resource", "KEYWORD"),    CANCEL_ADMATCH("cancel_admatch@resource", "KEYWORD"),    MODIFY_COST_LIMIT("modify_cost_limit@resource", "ACCOUNT"),    MODIFY_BALANCE_ALERT_AMOUNT("modify_balance_alert_amount@resource", "ACCOUNT"),    MODIFY_BALANCE_ALERT_EMAIL("modify_balance_alert_email@resource", "ACCOUNT"),    MODIFY_BALANCE_ALERT_PHONE("modify_balance_alert_phone@resource", "ACCOUNT"),    ACCEPT_AGREEMENT("accept_agreement@resource", "ACCOUNT"),    START_ACCOUNTS_TATUS("start_account_status@resource", "ACCOUNT"),    STOP_ACCOUNT_STATUS("stop_account_status@resource", "ACCOUNT"),    SETTING_ACCOUNT_LANGUAGE("setting_account_language@resource", "ACCOUNT"),    CANCEL_ACCOUNT_LANGUAGE("cancel_account_language@resource", "ACCOUNT"),    ALLOW_RECOMMEND_KEYWORD("allow_recommend_keyword@resource", "ACCOUNT"),    DONT_ALLOW_RECOMMEND_KEYWORD("dont_allow_recommend_keyword@resource", "ACCOUNT"),    UNFREEZE_CUST("unfreeze_cust@resource", "ACCOUNT"),    ADD_OFFER("add_offer@resource", "PRODUCT"),    CLEAN_PRODUCT("clean_product@resource", "PRODUCT"),    DELETE_OFFER("delete_offer@resource", "PRODUCT"),    ADD_ALL_OFFER("add_all_offer@resource", "PRODUCT"),    DELETE_ALL_OFFER("delete_all_offer@resource", "PRODUCT"),    ADD_BEST_MATCH_OFFER("add_best_match_offer@resource", "PRODUCT"),    CREAT_TAG("create_tag@resource", "TAG"),    MODIFY_TAG_NAME("modify_tag_name@resource", "TAG"),    DELETE_TAG("delete_tag@resource", "TAG"),    INSERT_AUTH_MANAGE("insert_authority@resource", "AUTHORITY"),    MODIFY_AUTH_MANAGE("modify_authority@resource", "AUTHORITY"),    CANCEL_AUTH_MANAGE("cancel_authority@resource", "AUTHORITY"),    START_QUICK_PROMOTION("start_quick_promotion@resource", "QUICKPRROMOTION"),    STOP_QUICK_PROMOTION("stop_quick_promotion@resource", "QUICKPRROMOTION"),    UPDATE_QUICK_PRICE("update_quick_price@resource", "QUICKPRROMOTION"),        private OperationType(String resourceKey, String type) {        this.resourceKey = resourceKey;        this.type = type;    }    private final String resourceKey;    private final String type;    public String getResourceKey() {        return resourceKey;    }    public String getType() {        return type;    }    public static OperationType getOperationType(String name) {        return OperationType.valueOf(name);    }}

上面定义了一个java枚举类型的类，构造函数的两个参数很重要，分别对应枚举实例的两个参数。下面的测试代码，可以明确告诉你如何使用java枚举获取对应的信息。

public class Test {public static void main(String[] args) {    OperationType operationType = OperationType.getOperationType("ADD_STOP_KEYWORD");            System.out.println("operationType.getType():" + operationType.getType());            System.out.println("operationType.getResourceKey():" + operationType.getResourceKey());}}

上例的输出结果如下：

<strong>operationType.getType():KEYWORDoperationType.getResourceKey():add_stop_keyword@resource</strong>

0 0