枚举类使用

public enum RequestMethod {

    GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS, TRACE

}

public class Test {

    public static void main(String[] args) {
        for (RequestMethod method : RequestMethod.values()) {
            System.out.println(method.name());
        }

    }
}

结果：

GET
HEAD
POST
PUT
PATCH
DELETE
OPTIONS
TRACE