java 用枚举替换多if-else

packagecom.polaris.design;

/*** @author：shi
 * @date ：Created in 2020/8/18 20:15
 * @description：
 * @modified By：
 */
public abstract classGeneralChannelRule {
    public abstract voidprocess();
}

packagecom.polaris.design;

/*** @author：shi
 * @date ：Created in 2020/8/18 20:18
 * @description：
 * @modified By：
 */
public class JDChannelRule extendsGeneralChannelRule {

    @Override
    public voidprocess() {
        System.out.println("我们大京东！");
    }
}

packagecom.polaris.design;

/*** @author：shi
 * @date ：Created in 2020/8/18 20:18
 * @description：
 * @modified By：
 */
public enumChannelRuleEnum {

    /*** 京东
     */JD("JD", newJDChannelRule()),

    /*** 头条
     */TOUTIAO("TOUTIAO", newTouTiaoChannelRule()),

    /*** 腾讯
     */TENCENT("TENCENT", newTencentChannelRule());

    publicString name;

    publicGeneralChannelRule channel;

    ChannelRuleEnum(String name, GeneralChannelRule channel) {
        this.name =name;
        this.channel =channel;
    }

    //匹配
    public staticChannelRuleEnum match(String name) {
        ChannelRuleEnum[] values =ChannelRuleEnum.values();
        for(ChannelRuleEnum value : values) {
            if(value.name.equals(name)) {
                returnvalue;
            }
        }
        return null;
    }

    publicString getName() {
        returnname;
    }

    publicGeneralChannelRule getChannel() {
        returnchannel;
    }
}

packagecom.polaris.design;

/*** @author：shi
 * @date ：Created in 2020/8/18 20:27
 * @description：
 * @modified By：
 */
public classTest1 {

    public static voidmain(String[] args) {
        String sign = "JD";
        ChannelRuleEnum channelRule =ChannelRuleEnum.match(sign);
        GeneralChannelRule rule =channelRule.channel;
        rule.process();
    }
}