如何使用Enum

public class EnumTemplate {

    private static final Log LOG = LogFactory.getLog(EnumTemplate.class);

    public enum TrafficLight {
        RED("红色", 1),
        GREEN("绿色", 2),
        YELLOW("黄色", 3);

        private String name;
        private int index;

        TrafficLight(String name,int index){
            this.name = name;
            this.index = index;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getIndex() {
            return index;
        }

        public void setIndex(int index) {
            this.index = index;
        }

        public static TrafficLight getEnum(int index) {
            for (TrafficLight trafficLight:TrafficLight.values()){
                if (trafficLight.getIndex() == index){
                    return trafficLight;
                }
            }
            return null;
        }
    }

    public static void main(String[] args) {
        LOG.info(TrafficLight.valueOf("RED"));
        LOG.info(TrafficLight.getEnum(1));
        LOG.info(TrafficLight.getEnum(2));
        LOG.info(TrafficLight.getEnum(4));
        LOG.info(TrafficLight.valueOf("red"));
    }
}