Java-简陋的图书管理

本文代码为原创一个简陋的管理系统，只做功能的测试。并没有去完善所有应有的功能，只做了输入输出查找。仅供参考！

菜单部分：

import java.util.Scanner;
public class Menu {
    int Min = 1;
    int Max = 3;
    public void getMenu(){
        System.out.println("1、显示/2、输入/3、查找");
    }
    public void getFindMenu(){
        System.out.println("1、编号/2、书名/3、作者");
    }
    public int setMenu(){
        System.out.println("输入序号:");
        Scanner reader = new Scanner(System.in);
        int num = reader.nextInt();
        if(num >= Min || num <= Max)
            return num;
        else
            return -1;
    }
}

重点的管理部分：

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Scanner;
import java.io.IOException;

public class Book {
    public void find(){
        Menu menu = new Menu();
        menu.getFindMenu();
        Scanner reader = new Scanner(System.in);
        int num = menu.setMenu();
        switch(num){
        case 1:
            System.out.println("请输入编号");
            Find(reader.next(), 0);
            break;
        case 2:
            System.out.println("请输入书名");
            Find(reader.next(), 1);
            break;
        case 3:
            System.out.println("请输入作者");
            Find(reader.next(), 2);
            break;
        }
    }
    public void Find(String s,int n){
        try {
            Scanner in = new Scanner(new File("res/Book.txt"));
            while (in.hasNextLine()) {
                String str = in.nextLine();
                String[] book = str.trim().split("#");
                if(book[n].compareTo(s) == 0)
                    System.out.println(book[0] +"  "+ book[1] +"  "+ book[2]);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    public String findNum(String s,int n){
        try {
            Scanner in = new Scanner(new File("res/Book.txt"));
            while (in.hasNextLine()) {
                String str = in.nextLine();
                String[] book = str.trim().split("#");
                if(book[n].compareTo(s) == 0)
                    return book[n];
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return "没有找到";
    }
    public String message(){
        Scanner reader = new Scanner(System.in);
        String str = "";
        String s = "";
        System.out.println("请输入编号");
        str = reader.next();
        if(findNum(str,0).compareTo("没有找到") != 0){
            System.out.println("此编号存在输入错误");
            return "@@!!";
        }
        s += str + "#";
        System.out.println("请输入书名");
        str = reader.next();
        s += str + "#";
        System.out.println("请输入作者");
        str = reader.next();
        s += str + "#
";
        return s;
    }
    public void setBook() {
        FileOutputStream fop = null;
        File file;
        String content = message();
        if(content.compareTo("@@!!") == 0)
            return ;    
        try {
            file = new File("res/Book.txt");
            fop = new FileOutputStream(file,true);
            byte[] contentInBytes = content.getBytes();
            fop.write(contentInBytes);
            fop.flush();
            fop.close();
            System.out.println("Done");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fop != null) {
                    fop.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void getBook() {
        try {
            Scanner in = new Scanner(new File("res/Book.txt"));
            while (in.hasNextLine()) {
                String str = in.nextLine();
                splitt(str);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static String[] splitt(String str) {
        String[] book = str.trim().split("#");
        for (int i = 0; i < book.length; i++) {
            System.out.println(book[i]);
        }
        System.out.println("
*********************");
        return book;
    }
}

主函数部分：

public class ManageBook {

    public static void main(String[] agse){
        Menu menu = new Menu();
        Book book = new Book();
        while(true){
            menu.getMenu();
            int num = menu.setMenu();
            switch(num){
                case 1:
                    book.getBook();
                    break;
                case 2:
                    book.setBook();
                    break;
                case 3:
                    book.find();
                    break;
                case -1:
                    System.out.println("输入有误");
                    break;
                }
        }
    }

}