import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
public class CustomerManager4 {
static ArrayList<Customer> custList = new ArrayList<>();
static int index = -1;
static Scanner scan = new Scanner(System.in);
public static void main(String[] args) {
loadCustomerData();
while(true) {
System.out.printf("\n[INFO] 고객 수 : %d, 인덱스 : %d\n", custList.size(), index);
System.out.println("메뉴를 입력하세요.");
System.out.println("(I)nsert, (P)revious, (N)ext, " +
"(C)urrent, (U)pdate, (D)elete, (S)ave, (Q)uit");
System.out.print("메뉴 입력: ");
String menu = scan.next();
menu = menu.toLowerCase();
switch(menu.charAt(0)) {
case 's':
System.out.println("고객 정보를 저장합니다.");
saveCustomerData();
break;
case 'i':
System.out.println("고객정보 입력을 시작합니다.");
insertCustomerData();
System.out.println("고객정보를 입력했습니다.");
break;
case 'p' :
System.out.println("이전 데이터를 출력합니다.");
if(index <= 0) {
System.out.println("이전 데이터가 존재하지 않습니다.");
}else {
index--;
printCustomerData();
}
case 'n' :
System.out.println("다음 데이터를 출력합니다.");
if(index >= custList.size()-1) {
System.out.println("다음 데이터가 존재하지 않습니다.");
}else {
index++;
printCustomerData();
}
break;
case 'c' :
System.out.println("현재 데이터를 출력합니다.");
if( (index >= 0) && (index < custList.size())) {
printCustomerData();
}else {
System.out.println("출력할 데이터가 선택되지 않았습니다.");
}
break;
case 'u' :
System.out.println("데이터를 수정합니다.");
if( (index >= 0) && (index < custList.size())) {
System.out.println(index + "번째 데이터를 수정합니다.");
updateCustomerData();
}else {
System.out.println("수정할 데이터가 선택되지 않았습니다.");
}
break;
case 'd' :
System.out.println("데이터를 삭제합니다.");
if( (index >= 0) && (index < custList.size())) {
System.out.println(index + "번째 데이터를 삭제합니다.");
deleteCustomerData();
}else {
System.out.println("삭제할 데이터가 선택되지 않았습니다.");
}
break;
case 'q' :
System.out.println("프로그램을 종료합니다.");
scan.close();
System.exit(0);
break;
default :
System.out.println("메뉴를 잘 못 입력했습니다.");
}
}
}
private static void loadCustomerData() {
String fileName = "customer.csv";
FileReader reader = null;
BufferedReader bufReader = null;
try {
reader = new FileReader(fileName);
bufReader = new BufferedReader(reader);
String line = null;
do {
line = bufReader.readLine();
if(line != null) {
String[] values = line.split(",");
Customer customer = new Customer();
customer.setName(values[0]);
customer.setGender(values[1].charAt(0));
customer.setEmail(values[2]);
customer.setBirthYear(Integer.parseInt(values[3]));
custList.add(customer);
}
}while(line != null);
System.out.println("데이터가 파일에서 로드됐습니다.");
} catch (IOException e) {
System.out.println("파일에서 데이터를 불러오는 도중 예외 발생 : " + e.getMessage());
} finally {
try { bufReader.close(); } catch(Exception e) {}
try { reader.close(); } catch(Exception e) {}
}
}
private static void saveCustomerData() {
String fileName = "customer.csv";
FileWriter writer = null;
BufferedWriter bufWriter = null;
try {
writer = new FileWriter(fileName);
bufWriter = new BufferedWriter(writer);
for(Customer customer : custList) {
bufWriter.write(customer.toCSV() + "\r\n");
}
bufWriter.flush();
System.out.println("Customer 데이터가 저장됐습니다.");
} catch (IOException e) {
System.out.println("파일 저장 중 예외 발생 : " + e.getMessage());
} finally {
try { bufWriter.close(); } catch(Exception e) { }
try { writer.close(); } catch(Exception e) { }
}
}
public static void insertCustomerData() {
System.out.print("이름 : ");
String name = scan.next();
System.out.print("성별(M/F) : ");
char gender = scan.next().charAt(0);
System.out.print("이메일 : ");
String email = scan.next();
System.out.print("출생년도 : ");
int birthYear = scan.nextInt();
Customer customer = new Customer();
customer.setName(name);
customer.setGender(gender);
customer.setEmail(email);
customer.setBirthYear(birthYear);
custList.add(customer);
}
public static void printCustomerData() {
System.out.println("==========CUSTOMER INFO================");
Customer customer = custList.get(index);
System.out.println("이름 : " + customer.getName());
System.out.println("성별 : " + customer.getGender());
System.out.println("이메일 : " + customer.getEmail());
System.out.println("출생년도 : " + customer.getBirthYear());
System.out.println("=======================================");
}
public static void deleteCustomerData() {
custList.remove(index);
}
public static void updateCustomerData() {
Customer customer = custList.get(index);
System.out.println("---------UPDATE CUSTOMER INFO----------");
System.out.print("이름(" + customer.getName() + ") :");
customer.setName(scan.next());
System.out.print("성별(" + customer.getGender() + ") :");
customer.setGender(scan.next().charAt(0));
System.out.print("이메일(" + customer.getEmail() + ") :");
customer.setEmail(scan.next());
System.out.print("출생년도(" + customer.getBirthYear() + ") :");
customer.setBirthYear(scan.nextInt());
}
}