2021-07-28 02:35:43

#Utility.java

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package lesson11;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Utility {
    public static String convertDateToString(Date datetime) {
        SimpleDateFormat format = new SimpleDateFormat("dd/mm/yyyy");
        
        return format.format(datetime);
    }
    
    public static Date convertStringToDate(String str) {
        SimpleDateFormat format = new SimpleDateFormat("dd/mm/yyyy");
        
        try {
            return format.parse(str);
        } catch (ParseException ex) {
            Logger.getLogger(Utility.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }
}

#Main.java

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package lesson11;

import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static Scanner scan;
    
    public static void main(String[] args) {
        scan = new Scanner(System.in);
        
        int choose;

        do {
            showMenu();
            choose = Integer.parseInt(scan.nextLine());
            
            switch(choose) {
                case 1:
                    DataMgr.getInstance().inputBook();
                    break;
                case 2:
                    DataMgr.getInstance().displayBook();
                    break;
                case 3:
                    DataMgr.getInstance().inputAuthor();
                    break;
                case 4:
                    DataMgr.getInstance().findBookByAuthor();
                    break;
                case 5:
                    System.out.println("Thoat!!!");
                    break;
                default:
                    System.out.println("Nhap sai!!!");
                    break;
            }
        } while(choose != 5);
    }
    
    static void showMenu() {
        System.out.println("1. Nhap thong tin sach");
        System.out.println("2. Hien thi");
        System.out.println("3. Nhap thong tin tac gia");
        System.out.println("4. Tim kiem theo tac gia");
        System.out.println("5. Thoat");
        System.out.println("Chon: ");
    }
}

#DataMgr.java

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package lesson11;

import java.util.ArrayList;
import java.util.List;
import static lesson11.Main.scan;

/**
 * DataMgr -> chi can tao duy nhat 1 object -> tu class object DataMgr
 * DataMgr -> singleton
 * @author Diep.Tran
 */
public class DataMgr {
    List<Book> bookList;
    List<Author> authorList;
    
    static DataMgr instance = null;
    
    private DataMgr() {
        bookList = new ArrayList<>();
        authorList = new ArrayList<>();
    }
    
    public static DataMgr getInstance() {
        if(instance == null) {
            instance = new DataMgr();
        }
        return instance;
    }

    public List<Book> getBookList() {
        return bookList;
    }

    public void setBookList(List<Book> bookList) {
        this.bookList = bookList;
    }

    public List<Author> getAuthorList() {
        return authorList;
    }

    public void setAuthorList(List<Author> authorList) {
        this.authorList = authorList;
    }
    
    public void inputBook() {
        System.out.println("Nhap so sach can them: ");
        int n = Integer.parseInt(scan.nextLine());
        
        for (int i = 0; i < n; i++) {
            Book book = new Book();
            book.input();
            
            bookList.add(book);
        }
    }

    public void displayBook() {
        System.out.println("============= Thong tin sach =============");
        
        bookList.forEach(book -> {
            book.display();
        });
    }

    public void inputAuthor() {
        System.out.println("Nhap so tac gia can them: ");
        int n = Integer.parseInt(scan.nextLine());
        
        for (int i = 0; i < n; i++) {
            Author author = new Author();
            author.input();
            
            authorList.add(author);
        }
    }

    public void findBookByAuthor() {
        System.out.println("Tim quan sach cua tac gia: ");
        String nickname = scan.nextLine();
        
        for (Book book : bookList) {
            if(book.getNickname().equalsIgnoreCase(nickname)) {
                book.display();
            }
        }
    }
    
    public boolean checkExistAuthor(String nickname) {
        if(authorList.isEmpty()) return false;
        
        for (Author author : authorList) {
            if(author.getNickname().equalsIgnoreCase(nickname)) {
                return true;
            }
        }
        return false;
    }
}

#Book.java

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package lesson11;

import java.util.Date;
import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class Book {
    String bookName, nickname;
    Date publishDate;

    public Book() {
    }

    public Book(String bookName, String nickname, Date publishDate) {
        this.bookName = bookName;
        this.nickname = nickname;
        this.publishDate = publishDate;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public Date getPublishDate() {
        return publishDate;
    }

    public void setPublishDate(Date publishDate) {
        this.publishDate = publishDate;
    }
    
    public void input() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Book -> Nhap ten sach: ");
        bookName = scan.nextLine();
        
        //Khi nhập tên bút danh của tác giả, nếu chưa tồn tại thì -> Xuất hiện màn hình nhập thông tin cho tác giả đó luôn.
        System.out.println("Book -> Nhap nickname: ");
        nickname = scan.nextLine();
        
        if(!DataMgr.getInstance().checkExistAuthor(nickname)) {
            //Nhap thong tin moi cho tac gia
            Author author = new Author(nickname);
            author.inputWithoutNickname();
            
            DataMgr.getInstance().authorList.add(author);
        }
        
        System.out.println("Book -> Nhap ngay xuat ban (dd/mm/YYYY): ");
        publishDate = Utility.convertStringToDate(scan.nextLine());
    }
    
    public void display() {
        System.out.println(this);
    }

    @Override
    public String toString() {
        return "Book{" + "bookName=" + bookName + ", nickname=" + nickname + ", publishDate=" + Utility.convertDateToString(publishDate) + '}';
    }
}

#Author.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package lesson11;

import java.util.Date;
import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class Author {
    String fullname, nickname,address;
    Date birthday;

    public Author() {
    }

    public Author(String fullname, String nickname, String address, Date birthday) {
        this.fullname = fullname;
        this.nickname = nickname;
        this.address = address;
        this.birthday = birthday;
    }

    public Author(String nickname) {
        this.nickname = nickname;
    }
    
    public String getFullname() {
        return fullname;
    }

    public String getNickname() {
        return nickname;
    }

    public String getAddress() {
        return address;
    }

    public Date getBirthday() {
        return birthday;
    }
    
    public void inputWithoutNickname() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Author -> Nhap ten: ");
        fullname = scan.nextLine();
        
        System.out.println("Author -> Nhap dia chi: ");
        address = scan.nextLine();
        
        System.out.println("Author -> Nhap ngay sinh (dd/mm/YYYY): ");
        birthday = Utility.convertStringToDate(scan.nextLine());
    }
    
    public void input() {
        inputWithoutNickname();
        
        Scanner scan = new Scanner(System.in);
        
        //Mỗi tác giả có bút danh duy nhất, ko được phép nhập trùng lặp tên bút danh của tác giả
        System.out.println("Author -> Nhap nickname: ");
        while(true) {
            nickname = scan.nextLine();
            boolean exist = DataMgr.getInstance().checkExistAuthor(nickname);
            if(exist) {
                System.out.println("Author -> Nickname da ton tai -> vui long nhap moi: ");
            } else {
                break;
            }
        }
    }
    
    public void display() {
        System.out.println(this);
    }

    @Override
    public String toString() {
        return "Author{" + "fullname=" + fullname + ", nickname=" + nickname + ", address=" + address + ", birthday=" + Utility.convertDateToString(birthday) + '}';
    }
}