DVD管理系统
import java.util.*; import java.text.*; class DVD { public static long charge(String dstr1,String dstr2){ long charge=0; SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd"); try { Date d1 = sd.parse(dstr1); Date d2 = sd.parse(dstr2); charge = (d2.getTime() - d1.getTime()) / (24 * 60 * 60 * 1000); } catch (ParseException e) { e.printStackTrace(); } return charge; } public static void main(String[] args) { Scanner input = new Scanner(System.in); boolean flag = false; // DVD名称 String[] names = new String[100]; int[] states = new int[20]; // DVD借出日期 String[] dates = new String[20]; // DVD借出次数 int[] count = new int[20]; // 初始化数据 names[0] = "罗马假日"; states[0] = 1; dates[0] = "2015-10-11"; count[0] = 18; names[1] = "风声鹤唳"; states[1] = 0; count[1] = 5; names[2] = "浪漫满屋"; states[2] = 0; count[2] = 40; int num = -1; do { // 主菜单显示 System.out.println("欢迎使用DVD管理器"); System.out.println("*-----------------*"); System.out.println("| 1、新增DVD |"); System.out.println("*-----------------*"); System.out.println("| 2、查看DVD |"); System.out.println("*-----------------*"); System.out.println("| 3、删除DVD |"); System.out.println("*-----------------*"); System.out.println("| 4、借出DVD |"); System.out.println("*-----------------*"); System.out.println("| 5、归还DVD |"); System.out.println("*-----------------*"); System.out.println("| 6、退出DVD |"); System.out.println("*-----------------*"); System.out.print("请输入所选："); int choice = input.nextInt(); switch (choice) { case 1: // 新增 System.out.println("---- 新增DVD ----"); System.out.print("请输入DVD名称："); String name = input.next(); // 标识能否插入 false:不能插入 true:能插入 boolean flag1 = false; for (int i = 0; i < names.length; i++) { // 插入DVD if (names[i] == null) { names[i] = name; flag1 = true; break; } } if (flag1) { System.out.println("新增《" + name + "》成功！"); } else { System.out.println("货架已满,不能新增！"); } break; case 2: // 查看 System.out.println("---- 查看DVD -----"); System.out.println("序号\t" + "状态\t" + "名称\t\t" + "借出日期" + "\t借出次数"); for (int i = 0; i < names.length; i++) { if (names[i] != null) { String state = (states[i] == 0) ? "可借" : "已借出"; String dateStr = (dates[i] == null) ? "\t" : (dates[i]); String countStr = (count[i] == 0) ? "\t" : (count[i] + "次"); System.out.println(" " + (i + 1) + "\t" + state + "\t" + names[i] + "\t" + dateStr + "\t" + countStr); } } break; case 3: // 删除 System.out.println("---- 删除DVD -----"); System.out.print("请输入要删除的DVD名称："); String delete = input.next(); boolean flag2 = false; // 记录要删除的DVD位置 int index = -1; // 找到要删除DVD的位置 for (int i = 0; i < names.length; i++) { if (names[i] != null && delete.equals(names[i]) && states[i] == 1) { flag2 = true; System.out.println("该DVD已经借出，无法删除！"); break; } else if (names[i] != null && delete.equals(names[i]) && states[i] == 0) { flag2 = true; index = i; System.out.println("删除《" + delete + "》成功！"); break; } } // 找到DVD删除 if (index != -1) { // 根据上一步找到的下标位置index for (int j = index; j < names.length; j++) { if (j != names.length - 1) { names[j] = names[j + 1]; states[j] = states[j + 1]; dates[j] = dates[j + 1]; count[j] = count[j + 1]; } names[names.length - 1] = null; states[names.length - 1] = 0; dates[names.length - 1] = null; count[names.length - 1] = 0; } } if (!flag2) { System.out.println("对不起，没有匹配的DVD信息，无法删除！"); } break; case 4: // 借出 System.out.print("请输入要借阅的DVD名称："); String want = input.next(); for (int i = 0; i <= names.length; i++) { if (names[i] == null) { System.out.println("没有找到匹配的DVD信息！"); break; } else if (want.equals(names[i]) && states[i] == 1) { System.out.println("《" + want + "》已被借出！"); break; } else if (want.equals(names[i]) && states[i] == 0) { System.out.print("请输入借出日期(年-月-日)："); dates[i] = input.next(); states[i] = 1; count[i]++; System.out.println("借出《" + want + "》成功！"); break; } } break; case 5: // 归还 System.out.print("请输入要归还的DVD名称："); String back = input.next(); for (int i = 0; i <= names.length; i++) { if (names[i] == null) { System.out.println("没有找到匹配的DVD信息"); break; } else if (back.equals(names[i]) && states[i] == 0) { System.out.println(back + "未被借出，无需归还！"); break; } else if (back.equals(names[i]) && states[i] == 1) { System.out.print("请输入归还日期(年-月-日)："); // 记录归还日期 String backDate = input.next(); states[i] = 1; count[i]++; System.out.println("《" + back + "》归还成功！"); System.out.println("《" + back + "》借阅日期：" + dates[i]); System.out.println("《" + back + "》归还日期：" + backDate); long day = charge(dates[i],backDate); // 计算租金:1元/天 long money = day * 1; //System.out.println("**********"+aa); System.out.println("《" + back + "》应付租金：" + money + "元"); // 数据更新 states[i] = 0; dates[i] = null; break; } } break; case 6: // 退出 flag = true; break; default: // 输入要求以外的数字，默认退出 flag = true; break; } if (flag) { // 想退出菜单 num = -1; break; } else { // 不退出，继续进行主菜单选择 System.out.println("*-*-*-*-*-*-*-*-*-*-*-*-*"); System.out.println("请输入0返回："); num = input.nextInt(); } } while (num == 0); // 程序退出，结束 System.out.println("谢谢使用本系统！"); } }
菜鸟级，不足之处，还望指点
