[JAVA] 나만의 ENUM 사용기

@Entity
public class Person {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    private JobStatus jobStatus;
}

public enum JobStatus {
        STUDENT,
        EMPLOYED,
        NOTEMPLOYED
    }

@RequiredArgsConstructor
public enum JobStatus {
        STUDENT("학생", "student"),
        EMPLOYED("취업성공", "employed"),
        NOTEMPLOYED("취업준비", "notemployed");

        private final String koreanName;
        private final String lowerCase;

      //JobStatus(String koreanName, String lowerCase){
      //      this.koreanName=koreanName;
      //	  this.lowerCase=lowerCase;
      //} 생략가능!
    }

@JsonFormat
@RequiredArgsConstructor
public enum JobStatus {
        STUDENT("학생"),
        EMPLOYED("취업성공"),
        NOTEMPLOYED("취업준비");

		@JsonValue
        private final String koreanName;
    }

@Getter
@RequiredArgsConstructor
public enum JobStatus {
    STUDENT("학생", Arrays.asList("HIGH_SCHOOL", "UNIVERSITY")),
    EMPLOYED("취업성공", Arrays.asList("SALARY_MAN", "SELF_EMPLOYED", "ETC")),
    NOTEMPLOYED("취업준비", Arrays.asList("CHALLENGING", "STUDYING", "GIVING_UP")),
    EMPTY("빈값", Collections.EMPTY_LIST);

    private final String koreanName;
    private final List<String> detailList;

	//String으로 들어온 값을 확인하고 해당 상수를 리턴한다. 
    public static JobStatus findByDetail(String input){
        return Arrays.stream(JobStatus.values())
                .filter(detail -> detail.hasDetailList(input))
                .findAny()
                .orElse(EMPTY);
    }

    public boolean hasDetailList(String input){
        return detailList.stream()
                .anyMatch(detail -> detail.equals(input));
    }
}

public class JobStatusTest {

    private String selectedDetail(){
        return "HIGH_SCHOOL";
    }

    @Test
    public void jobStatusTest(){
        //given
        String detail = selectedDetail();

        //when
        JobStatus jobStatus = JobStatus.findByDetail(detail);

        //then
        assertEquals(jobStatus.name(), "STUDENT");
        assertEquals(jobStatus.getKoreanName(), "학생");
    }
}

@Getter
@RequiredArgsConstructor
public enum Detail {

    HIGH_SCHOOL("고등학생"),
    UNIVERSITY("대학생"),
    SALARY_MAN("직장인"),
    SELF_EMPLOYED("자영업자"),
    ETC("기타"),
    CHALLENGING("취업도전중"),
    STUDYING("취업공부중"),
    GIVING_UP("포기상태");

    private final String koreanName;
}

@Getter
@RequiredArgsConstructor
public enum JobStatus {
    STUDENT("학생", Arrays.asList(Detail.HIGH_SCHOOL, Detail.UNIVERSITY)),
    EMPLOYED("취업성공", Arrays.asList(Detail.SALARY_MAN, Detail.SELF_EMPLOYED, Detail.ETC)),
    NOTEMPLOYED("취업준비", Arrays.asList(Detail.CHALLENGING, Detail.STUDYING, Detail.GIVING_UP)),
    EMPTY("빈값", Collections.EMPTY_LIST);

    private final String koreanName;
    private final List<Detail> detailList;

	//타입을 변경해 타입 안정성을 확보한다. 
    public static JobStatus findByDetail(Detail inputDetail){
        return Arrays.stream(JobStatus.values())
                .filter(detail -> detail.hasDetailList(inputDetail))
                .findAny()
                .orElse(EMPTY);
    }

    public boolean hasDetailList(Detail inputDetail){
        return detailList.stream()
                .anyMatch(detail -> detail.equals(inputDetail));
    }
}

public class JobStatusTest {
   private Detail selectedDetail2(){
        return Detail.STUDYING;
    }
    
    @Test
    public void jobStatusTest2(){
        //given
        Detail detail = selectedDetail2();

        //when
        JobStatus jobStatus = JobStatus.findByDetail(detail);

        //then
        assertEquals(jobStatus.name(), "NOTEMPLOYED");
        assertEquals(jobStatus.getKoreanName(), "취업준비");
    }