这里有新鲜出炉的Java设计模式,程序狗速度看过来!
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
这篇文章主要为大家详细介绍了一个简陋的java图书管理系统,简单的实现功能测试,感兴趣的小伙伴们可以参考一下
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;
- }
- }
- }
- }
来源: http://www.phperz.com/article/17/1113/360418.html