一个简陋的java图书管理系统

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 + "#\n";
 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("\n*********************");
 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;
  }
 }
 }

}

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