package com.exam01;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.StringTokenizer;
//메뉴선택, 학생정보 입력, 입력한 학생 전체 목록 보기, 학생 이름으로 찾기, 파일로 저장하기 메소드
public class StudentManager {
static Scanner sc=new Scanner(System.in);
static ArrayList<Student>arr=new ArrayList<Student>();
File dir,file;
public StudentManager() throws IOException, ClassNotFoundException {
dir=new File("src\\com\\exam01");
file=new File(dir, "Student.txt");
if(file.exists()) {
ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
arr=(ArrayList<Student>)ois.readObject();
}else {
file.createNewFile();
}
}
public static void showMenu() {
System.out.println("선택하세요");
System.out.println("1.데이터입력");
System.out.println("2.전체보기");
System.out.println("3.학생찾기");
System.out.println("4.종료");
System.out.println("선택>>");
}
public void inputData() {
while(true) {
System.out.println("학생 이름,학과,학번,학점평균 입력하세요.(입력은 , 로 구분하고 종료는 x)");
System.out.println(">>");
try {
String text=StudentManager.sc.nextLine();
if(text.toLowerCase().equals("x")) {
System.out.println("입력 종료");
break;
}
StringTokenizer stk=new StringTokenizer(text,",");
String name=stk.nextToken();
String dept=stk.nextToken();
int studentID=Integer.parseInt(stk.nextToken());
double avg=Double.parseDouble(stk.nextToken());
arr.add(new Student(name, dept, studentID, avg));
}catch (NoSuchElementException n) {
System.out.println("정확하게 입력하세요.");
return;
}
}
}
public void viewData() {
System.out.println("전체보기");
for(Student student:arr) {
System.out.println("이름: "+student.getName());
System.out.println("학과: "+student.getDept());
System.out.println("학번: "+student.getStudentID());
System.out.println("학점평균: "+student.getAvg());
System.out.println();
}
}
public void searchData() {
System.out.println("학생 찾기....");
System.out.println("찾을 학생 이름>>");
String searchName=StudentManager.sc.next();
Student s=search(searchName);
if(s==null) {
System.out.println("찾는 학생 없음");
return;
}
System.out.println("이름: "+s.getName());
System.out.println("학과: "+s.getDept());
System.out.println("학번: "+s.getStudentID());
System.out.println("학점평균: "+s.getAvg());
}
private Student search(String searchName) {
for(int i=0;i<arr.size();i++) {
if(searchName.equals(arr.get(i).getName())) { //arraylist는 get으로 접근, 크기는 size
return arr.get(i);
}
}
return null;
}
public void saveData() throws FileNotFoundException, ClassNotFoundException, EOFException, IOException {
ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(arr);
}
public static void main(String[] args) throws InputMismatchException, FileNotFoundException, ClassNotFoundException, IOException{
StudentManager sm=new StudentManager();
while(true) {
StudentManager.showMenu();
int num=sc.nextInt();
sc.nextLine();
switch(num) {
case 1 : sm.inputData(); break;
case 2 : sm.viewData(); break;
case 3 : sm.searchData(); break;
case 4 : sm.saveData();
System.out.println("프로그램 종료");
System.exit(0);
default : System.out.println("입력오류");
}
}
}
}
