java中枚举用法

package com.sgcc.model;

public enum EventsValueEnum {

	 MY_HITS("0001", "春眠不觉晓"),
        RULE_HITS("0002", "处处闻啼鸟"),
        SEARCH_HITS("0003", "夜来风雨声"),
        TOTAL_ITEM_SHARE("0004", "花落知多少");


    private String type;
    private String msg;

    private EventsValueEnum(String type, String msg) {
        this.type = type;
        this.msg = msg;
    }

    /**
     * 根据code获取枚举名称
     * @param type
     * @return
     */
    public static EventsValueEnum instance(String type) {
        for (EventsValueEnum deviceAdType : EventsValueEnum.values()) {
            if(deviceAdType.getType().equals(type)) {
                return deviceAdType;
            }
        }
        return null;
    }
    /**
     * 根据code获取value
     * @param type
     * @return
     */
    public static String getMsgByType(String type){
        for(EventsValueEnum adTypeEnum:EventsValueEnum.values()){
            if(type.equals(adTypeEnum.getType())){
                return adTypeEnum.getMsg();
            }
        }
        return  null;
    }
    /**
     * 根据name获取code
     * @param msg
     * @return
     */
    public static String getTypeByMsg(String msg){
        for(EventsValueEnum adTypeEnum:EventsValueEnum.values()){
            if(msg.equals(adTypeEnum.getMsg())){
                return adTypeEnum.getType();
            }
        }
        return  null;
    }

    public String getType() {
        return type;
    }

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

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

}

　　测试

public class NewOrder {

    public static void main(String[] args) {

        String a="0001";
        String b="0002";
        String c="0003";
        String d="0004";
        String aa=DeviceAdTypeEnum.getMsgByType(a);
        String bb=DeviceAdTypeEnum.getMsgByType(b);
        String cc=DeviceAdTypeEnum.getMsgByType(c);
        String dd=DeviceAdTypeEnum.getMsgByType(d);

        System.out.println(aa+"；");
        System.out.println(bb+"。");
        System.out.println(cc+"；");
        System.out.println(dd+"。");


    }


}

　　打印

D:\work\java\jdk1.8\jdk1.8\jdk1.8.0_51\bin\java.exe "
春眠不觉晓；
处处闻啼鸟。
夜来风雨声；
花落知多少。

Process finished with exit code 0