还记得之前的图书管理吗？

学习了集合以后，使用集合来进行图书信息的 存储吧。。

1.管理员登陆

2.图书管理

2.1 图书新增

2.2 图书修改

2.3 图书删除

2.4 根据图书名称模糊查找图书

2.5 查看所有图书 （三种排序）

2.6（新增）价格从高到低排序

2.7（新增）价格从低到高排序

2.8（新增）新旧排序(出版日期排序)

模块图

bean.Book

public class Book implements Comparable<Book>{
    private String name;
    private double price;
    private int year;
    private int month;

    public Book() {
    }

    public Book(String name, double price, int year, int month) {
        this.name = name;
        this.price = price;
        this.year = year;
        this.month = month;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Book book = (Book) o;
        return  year == book.year && month == book.month && Objects.equals(name, book.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, price, year, month);
    }

    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", price=" + price +
                ", year=" + year +
                ", month=" + month +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public int getMonth() {
        return month;
    }

    public void setMonth(int month) {
        this.month = month;
    }

    @Override
    public int compareTo(Book o) {
        if(this.price ==o.price) {
            return 0;
        }else if(this.price -o.price >0){
            return 1;
        }else{
            return -1;
        }
    }
    public static class BookComparator implements Comparator<Book>{

        @Override
        public int compare(Book o1, Book o2) {
            if((o1.getYear() == o2.getYear()) && (o1.getMonth() == o2.getMonth())) {
                return 0;
            }else if((o1.getYear()-o2.getYear()>0)|| ((o1.getYear()==o2.getYear())&&(o1.getMonth()-o2.getMonth()>0))){
                return 1;
            }else {
                return -1;
            }
        }
    }
}

dao.BookDao

public class BookDao {
    //书柜
    private List<Book> list = new ArrayList<>();
    public BookDao(){
        list.add(new Book("静夜思",12,1994,6));
        list.add(new Book("一",20,2000,12));
        list.add(new Book("二",40,2020,12));
        list.add(new Book("三",35,2021,12));
    }
    public List<Book> getBookList(){
        return list;
    }

    public Book add(Book book) {
        list.add(book);
        return book;
    }

    public boolean del(String name) {
        int index = findBookByName(name);
        if(index==-1){
            System.out.println("图书不存在！");
        }
        list.remove(index);
        return true;
    }
    public int findBookByName(String name){
        for(int i=0;i<list.size();i++){
            if(list.get(i).getName().equals(name)){
                return i;
            }
        }
        return -1;
    }

    public boolean update(String name, Book newBook) {
        int index = findBookByName(name);
        if(index == -1){
            System.out.println("该图书不存在！");
        }
        Book book = list.get(index);
        book.setName(newBook.getName());
        book.setPrice(newBook.getPrice());
        book.setYear(newBook.getYear());
        book.setMonth(newBook.getMonth());
        return true;
    }

    public Book findBookByWord(String word) {
        for(int i=0;i<list.size();i++){
            if(list.get(i).getName().contains(word)){
                return list.get(i);
            }
        }
        return null;
    }
}

view.BookView

public class BookView {
    Scanner input = new Scanner(System.in);
    private BookDao bookDao = new BookDao();

    public int menu() {
        int menu = -1;
        do {
            System.out.println("1.图书新增");
            System.out.println("2.图书删除");
            System.out.println("3.图书修改");
            System.out.println("4.根据图书名称模糊查找图书");
            System.out.println("5.查看所有图书");
            System.out.println("0.退出");
            String strNum = input.nextLine();
            try {
                menu = Integer.parseInt(strNum);
                break;
            } catch (Exception e) {
                System.out.println("请输入数字！");
                menu();
            }
            if (menu < 0 || menu > 5) {
                System.out.println("请输入正确的序号！");
                menu();
            }
        }while(true);
        if(menu == 0){
            System.out.println("谢谢使用！");
        }else if(menu == 1){
            add();
        }else if(menu == 2){
            del();
        }else if(menu == 3){
            update();
        }else if(menu == 4){
            System.out.println("根据图书名称模糊查找图书");
            System.out.println("请输入图书名称包含的关键字：");
            String word = input.nextLine();
            try{
                Book book = bookDao.findBookByWord(word);
                if(book!=null){
                    System.out.println("找到图书了："+book);
                }else{
                    System.out.println("查找失败");
                }
            }catch (Exception e){
                System.out.println("查找失败！");
                System.out.println(e.getMessage());
            }
        }else if(menu == 5){
            int num = -1;
            List<Book> list = bookDao.getBookList();
            do {
                System.out.println("请选择查看顺序");
                System.out.println("1.随机查看");
                System.out.println("2.按价格升序查看");
                System.out.println("3.按出版升序查看");
                System.out.println("0.退出");
                System.out.println("---原顺序查看所有图书---");
                String numStr = input.nextLine();
                try {
                    num = Integer.parseInt(numStr);
                    break;
                } catch (Exception e) {
                    System.out.println("请输入数字！");
                    System.out.println(e.getMessage());
                }
            }while(true);
            if(num<0 || num>4){
                System.out.println("请输入正确的序号！");
            }else if(num == 1) {
                for (Book book : list) {
                    System.out.println(book);
                }
            }else if(num == 2) {
                System.out.println("---按价格排序---");
                Collections.sort(list);
                for (Book book : list) {
                    System.out.println(book);
                }
            }else if(num == 3) {
                System.out.println("---按出版日期排序---");
                Collections.sort(list,new Book.BookComparator());
                for (Book book : list) {
                    System.out.println(book);
                }
            }
        }
        return menu;
    }
    public void update(){
        System.out.println("---修改图书---");
        System.out.println("请输入修改的图书名称：");
        String name =input.nextLine();
        System.out.println("请输入新的图书名称、价格、年份、月份");
        Book newBook = new Book();
        newBook.setName(input.nextLine());
        String priceStr=input.nextLine();
        double price = Double.parseDouble(priceStr);
        newBook.setPrice(price);
        String yearStr = input.nextLine();
        int year = Integer.parseInt(yearStr);
        newBook.setYear(year);
        String monthStr = input.nextLine();
        int month = Integer.parseInt(monthStr);
        newBook.setMonth(month);
        try{
            if(bookDao.update(name,newBook)){
                System.out.println("修改成功！");
            }else{
                System.out.println("修改失败！");
            }
        }catch (Exception e){
            System.out.println("修改失败！");
            System.out.println(e.getMessage());
        }
    }
    public void del(){
        System.out.println("---图书删除---");
        System.out.println("请输入删除的图书名称：");
        String name = input.nextLine();
        try{
            if(bookDao.del(name)){
                System.out.println("删除成功！");
            }else{
                System.out.println("删除失败！");
            }
        }catch (Exception e){
            System.out.println("删除失败");
            System.out.println(e.getMessage());
        }
    }
    public void add(){
        System.out.println("---图书新增---");
        Book book = new Book();
        String name = insertName();
        double price = insertPrice();
        int year = insertYear();
        int month = insertMonth();
        book.setName(name);
        book.setPrice(price);
        book.setYear(year);
        book.setMonth(month);
        try{
            book = bookDao.add(book);
            System.out.println("新增成功！书名："+book.getName());
        }catch (Exception e){
            System.out.println("新增失败！");
            System.out.println(e.getMessage());
        }
    }
    public String insertName(){
        System.out.println("请输入书名：");
        String name = input.nextLine();
        return name;
    }
    public double insertPrice(){
        double price = 0;
        System.out.println("请输入价格：");
        String priceStr = input.nextLine();
        try{
            price = Double.parseDouble(priceStr);
        }catch (Exception e){
            System.out.println("请输入价格数字！");
            return insertPrice();
        }
        if(price < 0){
            System.out.println("价格不能为负！请重新输入");
            return insertPrice();
        }
        return price;
    }
    public int insertYear(){
        int year = -1;
        System.out.println("请输入出版年份：");
        String yearStr = input.nextLine();
        try{
            year = Integer.parseInt(yearStr);
        }catch (Exception e){
            System.out.println("请输入年份数字！");
            return insertYear();
        }
        if(year < 0 || year >2022){
            System.out.println("年份有误，请重新输入！");
            return insertYear();
        }
        return year;
    }
    public int insertMonth(){
        int month = -1;
        System.out.println("请输入出版的月份：");
        String monthStr = input.nextLine();
        try{
            month = Integer.parseInt(monthStr);
        }catch (Exception e){
            System.out.println("请输入月份数字！");
            return insertMonth();
        }
        if(month <0 || month >12){
            System.out.println("月份输入有误，请重新输入！");
            return insertMonth();
        }
        return month;
    }
}

main.MainTest

public class MainTest {
    public static void main(String[] args) {
        BookView bookView = new BookView();
        Scanner input = new Scanner(System.in);
        Login login = new Login();
        while (true) {
            login.login();
            break;
        }
        while(true) {
            if(bookView.menu()==0){
                break;
            }
        }
    }
}

标签：训练任务,return,管理,System,Book,println,public,图书,out
来源： https://blog.csdn.net/mozhishao/article/details/118485177