Books.rar

package com.javatom.test; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.*; public class BookMgr { /** * 创建图书对象 */ BookSet book = new BookSet(); /** * 初始三个图书 */ public void initial() { book.name[0] = "数据结构"; book.state[0] = 0; book.date[0] = "2018-7-1"; book.count[0] = 15; book.name[1] = "数据库"; book.state[1] = 1; book.count[1] = 12; book.name[2] = "离散数学"; book.state[2] = 1; book.count[2] = 30; } /** * 开始菜单 */ public void startMenu() { System.out.println("欢迎使用图书借阅系统"); System.out.println("-------------------------------------"); System.out.println("0.查 看 图 书"); System.out.println("1.添加图书 "); System.out.println("2.查找图书 "); System.out.println("3.删除图书 "); System.out.println("4.借出图书 "); System.out.println("5.归还图书 "); System.out.print("--------------------------------------\n"); System.out.print("请选择： "); Scanner input = new Scanner(System.in); int choice = input.nextInt(); switch (choice) { case 0:// 查 看 图 书 list(); break; case 1:// 添加图书 add(); break; case 2: search(); // 查看图书 break; case 3:// 退出 delete();// 删除图书 break; case 4: lend();// 借出图书 break; case 5: returnbook();// 归还图书 break; } } private void returnbook() { System.out.println("---> 归还图书\n"); Scanner input = new Scanner(System.in); long loan = 0;// 租金 System.out.print("请输入图书名称： "); String want = input.next(); for (int i = 0; i < book.name.length; i++) { if (book.name[i] == null) { // 无匹配 System.out.println("没有找到匹配信息！"); break; } else if (book.name[i].equals(want) && book.state[i] == 0) { // 找到匹配 book.state[i] = 1; System.out.print("请输入归还日期（年-月-日）："); String redate = input.next(); // 计算租金 loan = charge(book.date[i], redate); System.out.println("\n归还《" + want + "》成功!"); System.out.println("借出日期为：" + book.date[i]); System.out.println("归还日期为：" + redate); System.out.println("应付租金（元）：" + loan); break; } else if (book.name[i].equals(want) && book.state[i] == 1) { // 找到匹配但没有借出 System.out.println("该图书没有被借出！无法进行归还操作。"); break; } } System.out.println("**************************"); returnMain(); } // 计算租金 private long charge(String data1, String data2) { // TODO Auto-generated method stub long charge=0; //日期类 SimpleDateFormat sd=new SimpleDateFormat("yyyy-MM-dd"); try { Date d1=sd.parse(data1); Date d2=sd.parse(data2); charge=(d2.getTime()-d1.getTime())/(24*60*60*100);//计算出归还天数，精确到小时分 } catch (ParseException e) { e.printStackTrace(); } return charge; } private void lend() { System.out.println("借出图书\n"); Scanner input = new Scanner(System.in); System.out.println("请输入图书名称"); String want = input.next();// 用户输入要借出书名 for (int i = 0; i < book.name.length; i++) { if (book.name[i] == null) { System.out.println("没有找到匹配图书信息"); break; } else if (book.name[i].equals(want) && book.state[i] == 1) { book.state[i] = 0;// 借出状态 System.out.println("请输入借出日期(年-月-日):"); book.date[i] = input.next(); System.out.println("借出<<" + want + ">>成功!"); book.count[i]++; break; } else if (book.name[i].equals(want) && book.state[i] == 0) { System.out.println("<<" + want + ">>图书已被借出"); break; } } System.out.println("*************************************"); returnMain(); } private void delete() { Scanner input = new Scanner(System.in); boolean flag = false;// 声明变量用来表示删除标识--是否删除成功 System.out.println("删除图书\n"); System.out.println("请输入要删除图书名称:"); String name = input.next(); // 遍历数组,查找匹配信息 for (int i = 0; i < book.name.length; i++) { // 查找到，每个元素前移一位 if (book.name[i] != null && book.name[i].equalsIgnoreCase(name) && book.state[i] == 1) { int j = i; while (book.name[j + 1] != null) { book.name[j] = book.name[j + 1]; book.state[j] = book.state[j + 1]; book.date[j] = book.date[j + 1]; j++; } // 最后一个不为空的元素 book.name[j] = null; book.date[j] = null; System.out.println("删除<<" + name + ">>成功"); flag = true;// 这个标识删除成功 break; } else if (book.name[i] != null && book.name[i].equalsIgnoreCase(name) && book.state[i] == 0) { System.out.println("<<" + name + ">>" + "没有借出，不能删除"); flag = false; break; } } System.out.println("*****************************"); returnMain();// 删除完后，返回主菜单 } private void add() { Scanner input = new Scanner(System.in); System.out.println("---> 新增图书\n"); System.out.print("请输入图书名称： "); String name = input.next(); for (int i = 0; i < book.name.length; i++) { if (book.name[i] == null) { // 查询最后一个空位置插入 book.name[i] = name; book.state[i] = 1;// 更改新增的图书可借状态 System.out.println("新增《" + name + "》成功！"); break; } } System.out.println("**************************"); returnMain(); } private void list() { // 定义新数组，用来存放排序后图书信息 String[] newname = new String[50]; // int[] newcount = new int[50]; for (int k = 0; k < book.name.length; k++) { newname[k] = book.name[k]; newcount[k] = book.count[k]; } // 利用冒泡排序算法进行排序 for (int i = 0; i < newname.length; i++) { for (int j = i + 1; j < newname.length; j++) { if (newcount[i] > newcount[j]) { int tempc = newcount[i]; newcount[i] = newcount[j]; newcount[j] = tempc; String tempn = newname[i]; newname[i] = newname[j]; newname[j] = tempn; } } } System.out.println("---> 排行榜\n"); System.out.println("**************************"); System.out.println("次数\t名称"); // 显示排行榜信息 for (int i = newname.length - 1; i >= 0; i--) { if (newname[i] != null) { System.out.println(newcount[i] + "\t<<" + newname[i] + ">>"); } } System.out.println("**************************"); returnMain(); } /** * 返回主菜单 */ public void returnMain() { Scanner input = new Scanner(System.in); System.out.print("输入0返回："); if (input.nextInt() == 0) { startMenu(); } else { System.out.println("输入错误, 异常终止！"); } } /** * 查看图书 */ public void search() { System.out.println("---> 查看图书\n"); System.out.println("序号\t状 态\t名称\t\t借出日期"); for (int i = 0; i < book.name.length; i++) { if (book.name[i] == null) { break; } else if (book.state[i] == 0) { System.out.println((i + 1) + "\t已借出\t" + "<<" + book.name[i] + ">>\t" + book.date[i]); } else if (book.state[i] == 1) { System.out.println((i + 1) + "\t可 借\t" + "<<" + book.name[i] + ">>"); } } System.out.println("**************************"); returnMain(); } }