9

1.

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;


public class first {
      static List<book> a= new ArrayList<book>();
      static {
            book b1 = new book("1", "书1", 10);
            a.add(b1);
            book b2 = new book("2", "书2", 20);
            a.add(b2);
            book b3 = new book("3", "书3", 30);
            a.add(b3);
        }
      public static void main(String[] args) {
           
            mune();
        }
      public static void mune() {
          for (;;) {
              System.out.println("***********************");
                System.out.println("*   1、添加图书         *");
                System.out.println("*   2、删除图书         *");
                System.out.println("*   3、修改图书         *");
                System.out.println("*   4、查询所有图书  *");
                System.out.println("*   5、查询一本图书  *");
                System.out.println("*   0、退出程序         *");
                System.out.println("***********************");
                int i = inputInt("请输入要选择的操作：");
                switch (i) {
                case 1:
                    addbook();
                    break;
                case 2:
                    delbook();
                    break;
                case 3:
                    updatebook();
                    break;
                case 4:
                    findAllbook();
                    break;
                case 5:
                    findbookByName();
                    break;
                case 0:
                    return;
                default:
                    System.out.println("请重新输入");
                    break;
        }
        
    }
}
      private static void findbookByName() {
            String name = inputStr("请输入要查找的图书名称");
            int index = 0;
            System.out.println("id\t图书名称\t价格");
            for (book book : a) {
                if (name.equals(book.getName())) {
                    System.out.println(book.getId() + "\t" + book.getName() + "\t"
                            + book.getPrice());
                }
                index++;
            }
        }

        private static void findAllbook() {
            System.out.println("id\t图书名称\t价格");
            for (book book : a) {
                System.out.println(book.getId() + "\t" + book.getName() + "\t"
                        + book.getPrice());
            }

        }

        private static void updatebook() {
            String id = inputStr("请输入要修改的图书id");
            int index = 0;
            for (book book : a) {
                if (id.equals(book.getId())) {
                    book.setName(inputStr("请输入修改后的名称:"));
                    book.setPrice(inputDouble("请输入修改后的价格:"));
                    a.remove(index);
                    a.add(index, book);
                }
                index++;
            }
        }

        private static void delbook() {
            String id = inputStr("请输入要删除的图书id");
            int index = 0;
            for (book book : a) {
                if (id.equals(book.getId())) {
                    a.remove(index);
                }
                index++;
            }

        }

        private static void addbook() {
            String id = inputStr("请输入图书id");
            String name = inputStr("请输入图书名称");
            double price = inputDouble("请输入图书价格");
            book book = new book(id, name, price);
            a.add(book);
        }

        public static String inputStr(String msg) {
            System.out.print(msg);
            return new Scanner(System.in).nextLine();
        }

        public static int inputInt(String msg) {
            System.out.print(msg);
            return new Scanner(System.in).nextInt();
        }

        public static double inputDouble(String msg) {
            System.out.print(msg);
            return new Scanner(System.in).nextDouble();
        }

}

 

public class book {
    private String id;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    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;
    }
    private String name;
    private double price;
    public book(String id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
    
   
    
}