枚举：

public enum CourseTypeEnum {    VIDEO_COURSE(1,"录制课程"),    LIVE_COURSE(2,"直播课程"),    OFFINE_COURSE(3,"线下课程");    private int seq;    private  String desc;    CourseTypeEnum(int seq,String desc){        this.seq=seq;        this.desc=desc;    }    public int getSeq(){        return seq;    }    public String gtDesc(){        return desc;    }}

　　抽象类：

public abstract class BaseCourseState {    public static  final  int NEW_COURSE=1;    public static  final  int UNAUTHED_COURSE=2;    public static  final int PASSED_COURSE=3;    public static  final int NOT_PASSED_COURSE=4;    public static final int DELETED_COURSE=5;}

　　调用：

public class Test {    public static void main(String[] args) {        public void getPackgeCourse(Long packageId,Long userId){           if(packageId==CourseTypeEnum.OFFINE_COURSE.getSeq()){               return;           }           if(course.getState==BaseCourseState.UNAUTHED_COURSE){               return ;           }        }    }}