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Create BookLendingSystem.java #1

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236 changes: 236 additions & 0 deletions 김정일/BookLendingSystem.java
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import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class Book {
private int bookId;
private String title;
private String author;
private boolean loanInfo;
private Loan recentLoan;

public Book(int bookId, String title, String author) {
this.bookId = bookId;
this.title = title;
this.author = author;
this.loanInfo = false;
this.recentLoan = null;
}

public int getBookId() {
return bookId;
}

public String getTitle() {
return title;
}

public String getAuthor() {
return author;
}

public boolean isLoanInfo() {
return loanInfo;
}

public void setLoanInfo(boolean loanInfo) {
this.loanInfo = loanInfo;
}

public Loan getRecentLoan() {
return recentLoan;
}

public void setRecentLoan(Loan recentLoan) {
this.recentLoan = recentLoan;
}
}

class Loan {
private int loanId;
private String borrower;
private Book book;
private int loanDate;
private int returnDate;

public Loan(int loanId, String borrower, Book book, int loanDate, int returnDate) {
this.loanId = loanId;
this.borrower = borrower;
this.book = book;
this.loanDate = loanDate;
this.returnDate = returnDate;
}

public int getLoanId() {
return loanId;
}

public String getBorrower() {
return borrower;
}

public Book getBook() {
return book;
}

public int getLoanDate() {
return loanDate;
}

public int getReturnDate() {
return returnDate;
}

public void setReturnDate(int returnDate) {
this.returnDate = returnDate;
}
}

public class BookLendingSystem {
private List<Book> books;
private List<Loan> loans;
private int nextLoanId;

public BookLendingSystem() {
this.books = new ArrayList<>();
this.loans = new ArrayList<>();
this.nextLoanId = 1;
}

public void addBook(int bookId, String title, String author) {
Book book = new Book(bookId, title, author);
books.add(book);
System.out.println("도서가 등록되었습니다.");
}

public void displayBooks() {
System.out.println("도서 목록:");
for (Book book : books) {
System.out.print("도서 ID: "
+ book.getBookId() + ", 제목: "
+ book.getTitle() + ", 저자: "
+ book.getAuthor()
+ ", 대출 여부: ");
if (book.isLoanInfo()) {
System.out.println("대출 중");
}
else {
System.out.println("대출 가능");
}
}
}

public void lendBook(int bookId, String borrower, int loanId, int loanDate) {
for (Book book : books) {
if (book.getBookId() == bookId) {
if (!book.isLoanInfo()) {
int returnDate = loanDate + 14; // 14일
Loan loan = new Loan(loanId, borrower, book, loanDate, returnDate);
loans.add(loan);
book.setLoanInfo(true);
System.out.println("도서 대출이 완료되었습니다.");
}
else {
System.out.println("이 도서는 이미 대출 중입니다.");
}
return;
}
}
System.out.println("Error : 해당 도서가 존재하지 않습니다.");
}

public void returnBook(int bookId) {
for (Book book : books) {
if (book.getBookId() == bookId) {
if (book.isLoanInfo()) {
for (Loan loan : loans) {
if (loan.getBook().getBookId() == bookId) {
loan.setReturnDate(loan.getReturnDate());
loans.remove(loan);
book.setLoanInfo(false);
book.setRecentLoan(null);
System.out.println("도서가 반납되었습니다.");
return;
}
}
}
else {
System.out.println("Error : 해당 도서는 현재 대출 중이 아닙니다.");
return;
}
}
}
System.out.println("Error : 해당 도서는 존재하지 않습니다.");
}

public void displayLoans(){
System.out.println("대출 정보:");
for (Loan loan : loans) {
System.out.println("대출자 ID: " + loan.getLoanId()
+ ", 대출자: " + loan.getBorrower()
+ ", 도서 ID: " + loan.getBook().getBookId()
+ ", 도서 제목: " + loan.getBook().getTitle()
+ ", 대출 일자: " + loan.getLoanDate()
+ ", 반납 일자: " + loan.getReturnDate());
}
}

public static void main(String[] args) {
BookLendingSystem library = new BookLendingSystem();
Scanner scanner = new Scanner(System.in);

while (true) {
System.out.println("도서 대출 시스템");
System.out.println("1. 도서 등록");
System.out.println("2. 도서 목록 출력");
System.out.println("3. 도서 대출");
System.out.println("4. 도서 반납");
System.out.println("5. 대출 정보 확인");
System.out.println("6. 종료");

int choice = scanner.nextInt();

switch (choice) {
case 1:
System.out.println("도서 ID를 입력하세요:");
int bookId = scanner.nextInt();
System.out.println("도서 제목을 입력하세요:");
String title = scanner.next();
System.out.println("저자를 입력하세요:");
String author = scanner.next();
library.addBook(bookId, title, author);
break;
case 2:
library.displayBooks();
break;
case 3:
System.out.println("대출할 도서의 ID를 입력하세요:");
int lendBookId = scanner.nextInt();
System.out.println("대출자의 이름을 입력하세요:");
String borrower = scanner.next();
System.out.println("대출자 ID를 입력하세요:");
int loanId = scanner.nextInt();
System.out.println("대출일을 입력하세요:");
int loanDate = scanner.nextInt();
library.lendBook(lendBookId, borrower, loanId, loanDate);
break;
case 4:
System.out.println("반납할 도서의 ID를 입력하세요:");
int returnBookId = scanner.nextInt();
library.returnBook(returnBookId);
break;
case 5:
library.displayLoans();
break;
case 6:
System.out.println("프로그램을 종료합니다.");
scanner.close();
System.exit(0);
break;
default:
System.out.println("Error : 잘못된 선택입니다. 다시 선택하세요.");
}
}

}
}