CRUD - Person.java

package oop;
 
import java.util.Scanner;
 
/*
 * RFP
 * Person(id, pass, name:String) 
 *       - Student(ssn:String, score:int), 
 *       - Admin(rank:int)
 * <사용자기능> Student
 * 1. 회원가입
 * 2. 로그인 
 * 3. 비번 수정
 * 4. 회원탈퇴
 * 5. 아이디 존재 체크
 * 6. 마이페이지
 * 7. 점수 입력
 * **********
 * <관리자기능> Admin
 * 1. 회원목록
 * 2. 아이디검색
 * 3. 이름검색
 * 4. 전체 회원수
 * 5. 성적별 현황 (스코어 기준 이름 내림차순 예.. 1등 이순신(여) 98점, 2등 김유신(남) 85점... )
 */
class Constants{
    public static final String MAN_MENU = "0.시스템종료 1.학생 2.관리자";
    public static final String STUDENT_MENU = "\n0.학생화면 종료 \n"+ 
            " 1. 회원가입\n" + 
            " 2. 로그인 \n" + 
            " 3. 비번 수정\n" + 
            " 4. 회원탈퇴\n" + 
            " 5. 아이디 존재 체크\n" + 
            " 6. 마이페이지\n" + 
            " 7. 점수 입력\n";
    public static final String ADMIN_MENU = "\n0.관리자화면 종료\n "+
            "1. 회원목록\n" + 
            "2. 아이디검색\n" + 
            "3. 이름검색\n" + 
            "4. 전체 회원수\n" + 
            "5. 성적별 현황\n";
    public static final String PERSON_SPEC = "아이디: %s 비번: %s 이름: %s";
    public static final String STUDENT_SPEC = "아이디: %s 비번: %s 이름: %s(%s) 주민번호: %s 점수: %d";
    public static final String ADMIN_SPEC = "관리자 아이디: %s 비번: %s 이름: %s 등급: %d";
}
class Person{
    protected String id, pass, name;
 
    public String getId() {return id;}
    public void setId(String id) {this.id = id;}
    public String getPass() {return pass;}
    public void setPass(String pass) {this.pass = pass;}
    public String getName() {return name;}
    public void setName(String name) {this.name = name;}
    @Override public String toString() {
        return String.format(Constants.PERSON_SPEC, id, pass, name);
    }
}
class Student extends Person{
    private String ssn, gender;private int score;
    
    public String getSsn() {return ssn;}
    public void setSsn(String ssn) {this.ssn = ssn;}
    public int getScore() {return score;}
    public void setScore(int score) {this.score = score;}
    public String getGender() {return gender;}
    public void setGender(String gender) {this.gender = gender;}
    @Override public String toString() {
        return String.format(Constants.STUDENT_SPEC, id, pass, name, gender, ssn, score);
    }
}
class Admin extends Person{
    private int rank;
 
    public int getRank() {return rank;}
    public void setRank(int rank) {this.rank = rank;}
    @Override public String toString() {
        return String.format(Constants.ADMIN_SPEC, id, pass, name, rank);
    }
}
interface PersonService{
    /** 1. 회원가입  */
    public void join(Student student);
    /** 2. 로그인  */  
    public String login(Student student);
    /** 3. 비번 수정  */
    public void changePass(Student student);
    /** 4. 회원탈퇴  */
    public void remove(Student student);
    /** 5. 아이디 존재 체크 */ 
    public String existId(String id);
    /** 6. 마이페이지 */ 
    public Student mypage(String id);
    /** 7. 점수 입력 */
    public void score(int[] arr);
    /** 8. 회원목록 */ 
    public Student[] studentList();
    /** 9. 아이디검색 */ 
    public Student idSearch(String id);
    /** 10. 이름검색  */
    public Student[] nameSearch(String name);
    /** 11. 전체 회원수 */ 
    public int studentCount();
    /** 12. 성적별 현황 */
    public Student[] gradeRank();
}
class PersonServiceImpl implements PersonService {
    private Student[] students;
    private int count;
    
    public PersonServiceImpl() {
        students = new Student[4]; 
        count = 0;
    }
 
    @Override
    public void join(Student student) {
        /** 1. 회원가입  */
        String gender = student.getSsn();
        String result = "";
        switch(gender.charAt(7)) { // 900505-1 이면 1의 인덱스는 7
            case '1': case '3': result = "남"; break;
            case '2': case '4': result = "여"; break;
            default : result ="오류";
        }
        student.setGender(result);
        students[count] = student;
        count++;
    }
 
    @Override
    public String login(Student student) {
        /** 2. 로그인  */ 
        String result = "로그인 실패";
        for(int i= 0; i < count; i++) {
            if(student.getId().equals(students[i].getId())
                    && 
               student.getPass().equals(students[i].getPass())) {
                result = "로그인 성공";
                break;
            }
        }
        return result;
        
    }
 
    @Override
    public void changePass(Student student) {
        /** 3. 비번 수정  */
        for(int i= 0; i < count; i++) {
            if(student.getId().equals(students[i].getId())) {
                students[i].setPass(student.getPass());
                break;
            }
        }
    }
 
    @Override
    public void remove(Student student) {
        /** 4. 회원탈퇴  */
        for(int i= 0; i < count; i++) {
            if(student.getId().equals(students[i].getId())
                    && 
               student.getPass().equals(students[i].getPass())) {
                students[i] = students[count - 1];
                students[count - 1]= null;
                count --;        
                break;
            }
        }
    }
 
    @Override
    public String existId(String id) {
        /** 5. 아이디 존재 체크 */ 
        String result = "사용 가능한 아이디";
        for(int i= 0; i < count; i++) {
            if(id.equals(students[i].getId())) {
                result ="이미 존재하는 아이디";
                break;
            }
        }
        return result;
    }
 
    @Override
    public Student mypage(String id) {
        /** 6. 마이페이지 */ 
        Student student = new Student();
        for(int i= 0; i < count; i++) {
            if(id.equals(students[i].getId())) {
                student = students[i];
                break;
            }
        }
        return student;
    }
 
    @Override
    public void score(int[] arr) {
        /** 7. 점수 입력 */
        for(int i=0; i< count; i++) {
            students[i].setScore(arr[i]);
        }
    }
 
    @Override
    public Student[] studentList() {
        /** 8. 회원목록 */ 
        return students;
    }
 
    @Override
    public Student idSearch(String id) {
        Student student = new Student();
        /** 9. 아이디검색 */ 
        for(int i= 0; i < count; i++) {
            if(id.equals(students[i].getId())) {
                student = students[i];
                break;
            }
        }
        return student;
    }
 
    @Override
    public Student[] nameSearch(String name) {
        /** 10. 이름검색  */
        int cnt = 0;
        for(int i= 0; i < count; i++) {
            if(name.equals(students[i].getName())) {
                cnt++;    
            }
        }
        Student[] sameNames = new Student[cnt];
        int k =0;
        for(int i= 0; i < count; i++) {
            if(name.equals(students[i].getName())) {
                sameNames[k] = students[i];
                k++;
                if(cnt == k) break;
            }
        }
        return sameNames;
    }
 
    @Override
    public int studentCount() {
        /** 11. 전체 회원수 */ 
        return count;
    }
 
    @Override
    public Student[] gradeRank() {
        /** 12. 성적별 현황 */
        for(int i=0; i< count; i++) {
            for(int j= 0; j < i; j++) {
                if(students[i].getScore() > students[j].getScore()) {
                    Student t = students[i];
                    students[i] = students[j];
                    students[j] = t;
                }
            }
        }
        return students;
    }
}
public class PersonApp {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        PersonService service = new PersonServiceImpl();
        Student student = null;
        Admin admin = null;
        while(true) {
            System.out.println(Constants.MAN_MENU);
            switch(scanner.nextInt()) {
            case 0: return;
            case 1: student(scanner, student, service); break;
            case 2: admin(scanner, admin, service); break;
            default: System.out.println("1. 학생 2. 관리자 선택바랍니다.");break;
            
            }
        }
    }
    public static void student(Scanner scanner, Student student, PersonService service) {
        System.out.println(Constants.STUDENT_MENU);
        // scanner 입력 생략
        String[] id = {"kim","you","lee","lee"};
        String[] name = {"김유신","유관순","이순신","이순신"};
        String[] ssn = {"900101-1","900501-2","900801-1","901201-2"};
        String result ="";
        switch (scanner.nextInt()) {
        case 0:return;
        case 1: /** 1. 회원가입  */
            for(int i=0; i < id.length; i ++) {
                student = new Student();
                student.setId(id[i]);
                student.setPass("1");
                student.setName(name[i]);
                student.setSsn(ssn[i]);
                service.join(student);
            }
            break;
        case 2: /** 2. 로그인  */ 
            student = new Student();
            student.setId(id[0]);
            student.setPass("1");
            result = service.login(student); 
            System.out.println(result);
            break;
        case 3: /** 3. 비번 수정  */
            student = new Student();
            student.setId(id[2]);
            student.setPass("2");
            service.changePass(student); 
            break;
        case 4: /** 4. 회원탈퇴  */
            student.setId(id[0]);
            student.setPass("1");
            service.remove(student); break;
        case 5: /** 5. 아이디 존재 체크 */ 
            System.out.println(service.existId("kim")); break;
        case 6: /** 6. 마이페이지 */ 
            System.out.println(service.mypage("kim")); break;
        case 7: /** 7. 점수 입력 */
            int[] scores = {70, 60, 80, 30};
            service.score(scores); 
            break;
        default:
            break;
        }
    }
 
    public static void admin(Scanner scanner, Admin admin, PersonService service) {
        System.out.println(Constants.ADMIN_MENU);
        switch (scanner.nextInt()) {
        case 0:return;
        case 1: 
            Student[] list = service.studentList();
            for(Student s : list) {
                System.out.println(s.toString());
            }
        break;
        case 2: System.out.println(service.idSearch("kim").toString()); break;
        case 3: 
            Student[] sameNames = service.nameSearch("이순신");
            for(Student s : sameNames) {
                System.out.println(s.toString());
            }
            break;
        case 4: 
            System.out.printf("총 %d 명",service.studentCount()); break;
        case 5: 
            Student[] ranks = service.gradeRank(); 
            for(Student s : ranks) {
                System.out.println(s.toString());
            }
            break;
        default:
            break;
        }
    }
 
    
}