Java ATM模拟系统报告
Posted 望山海
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设计内容:
本系统采用JAVA语言编写测试完成,基本上在字符界面下模拟了ATM系统的相关实现。
本系统主要模拟银行ATM机系统功能,主要有查阅、取款、存款、添加用户、删除用户等功能。
技术说明:
项目目录下必须有一个已经录入的用户文件,名为ATMUsers (无后缀名,压缩包内已有一份),否则将报错。
当输入用户的卡号和密码时,系统能登录ATM柜员机系统,用户可以按照以下规则进行:
查询余额。
ATM取款:每次取款金额不得大于100,总额不得超过余额。
ATM存款:不能出现负存款。
当输入用户名000000与密码000000时,能登录ATM柜员机系统的管理员账户,管理员可以按照以下规则进行:
列出用户:列出ATM系统上的所有用户。
添加用户:卡号必须为10位,新密码长度必须为6位,只有卡号与密码都符合要求的情况下才可以添加用户。
删除用户:输入卡号以删除卡号对应用户的记录,删除前必须键入Y以确认。
源代码:
import java.util.*; import java.io.*; public class ATM { static int number; static int usernum = 0; static boolean isAdmin = false; public static Scanner kbd = new Scanner(System.in); public static void readLength() throws IOException { BufferedReader file = null; try { file = new BufferedReader(new InputStreamReader(new FileInputStream("ATMUsers"))); String line = null; int count = 0; while ((line = file.readLine()) != null) count++; number = count; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (file != null) { try { file.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static void readUsers(String[][] users) throws IOException { BufferedReader file = null; try { file = new BufferedReader(new InputStreamReader(new FileInputStream("ATMUsers"))); String line = null; int count = 0; while ((line = file.readLine()) != null) { String data = line; String[] strArray = data.split(" "); users[0][count] = strArray[0]; users[1][count] = strArray[1]; users[2][count] = strArray[2]; count++; } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (file != null) { try { file.close(); } catch (IOException e) { e.printStackTrace(); } } } } public static String checkID(String acctNum, String pwd, String[][] users) { String result = "错误!"; for(int i = 0;i < number;i++) { if (acctNum.equals("000000") && pwd.equals("000000")) { isAdmin = true; return "0"; } if (acctNum.equals(users[0][i]) && pwd.equals(users[1][i])) { result = users[2][i]; usernum = i; } } return result; } public static int menu() { int menuChoice; do { System.out.print("\n请选择想要执行的操作:\n" + "**********************" + "\n* 一、余额\t二、存款 *\n" + "* *" + "\n* 三、取款\t四、退出 *\n" + "**********************\n"); menuChoice = kbd.nextInt(); if (menuChoice < 1 || menuChoice > 4){ System.out.println("错误!"); } }while (menuChoice < 1 || menuChoice > 4); return menuChoice; } public static int adminMenu() { int menuChoice; do { System.out.print("\n请选择想要执行的操作:\n" + "******************************" + "\n* 一、读取用户\t二、添加用户 *\n" + "* *" + "\n* 三、删除用户\t四、退出管理 *\n" + "******************************\n"); menuChoice = kbd.nextInt(); if (menuChoice < 1 || menuChoice > 4){ System.out.println("错误!"); } }while (menuChoice < 1 || menuChoice > 4); return menuChoice; } public static void displayBalance(double x) { System.out.printf("\n您的余额为 $%.2f\n", x); } public static double deposit(double x, double y, String[][] users) { double depositAmt = y, currentBal = x; double newBalance = depositAmt + currentBal; System.out.printf("您现在的余额为:$%.2f\n", newBalance); users[2][usernum] = "" + newBalance; return newBalance; } public static double withdraw(double x, double y, String[][] users) { double withdrawAmt = y, currentBal = x, newBalance; newBalance = currentBal - withdrawAmt; users[2][usernum] = "" + newBalance; System.out.printf("您现在的余额为:$%.2f\n",newBalance); return newBalance; } public static String[][] addUser(String[][] users) throws IOException { System.out.print("\n请输入您想要添加的用户卡号:"); String data1 = kbd.next(); if(data1.length() != 10) { System.out.print("卡号长度不符!"); return users; } for(int i = 0;i < number;i++) { if(data1 == users[0][i]) System.out.print("已有同名用户!"); return users; } System.out.print("\n请输入密码:"); String data2 = kbd.next(); if(data2.length() != 6) { System.out.print("密码长度不符!"); } System.out.print("\n请输入初始资金:"); String data3 = kbd.next(); String[][] newusers = new String[3][number + 1]; for(int i = 0; i < number;i++) { newusers[0][i] = users[0][i]; newusers[1][i] = users[1][i]; newusers[2][i] = users[2][i]; } newusers[0][number] = data1; newusers[1][number] = data2; newusers[2][number] = data3; FileWriter fileWriter = new FileWriter("ATMUsers",true); BufferedWriter bufferWriter = new BufferedWriter(fileWriter); bufferWriter.newLine(); bufferWriter.write(data1); bufferWriter.write(‘ ‘); bufferWriter.write(data2); bufferWriter.write(‘ ‘); bufferWriter.write(data3); bufferWriter.close(); number++; System.out.print("\n添加成功!"); return newusers; } public static void deleteUser(String[][] users) throws IOException { System.out.print("\n请输入您想要删除的用户卡号:"); String todelete = kbd.next(); int i; boolean exist = false; for(i = 0;i < number;i++) { if(todelete.equals(users[0][i])) { exist = true; break; } } if(exist != true) { System.out.print("\n错误:用户不存在!"); return; } System.out.print("\n确认要删除该用户吗?(键入Y以确认)"); String check = kbd.next(); if(!check.equals("y") && !check.equals("Y")) { return; } int j; for(j = i;j < number - 1;j++) { users[0][j] = users[0][j + 1]; users[1][j] = users[1][j + 1]; users[2][j] = users[2][j + 1]; } number--; System.out.print("\n删除成功!"); } public static void remakeFile(String[][] users) throws IOException { File file = new File("ATMUsers"); file.delete(); File newfile = new File("ATMUsers"); newfile.createNewFile(); FileWriter fileWriter = new FileWriter(newfile.getName(),true); BufferedWriter bufferWriter = new BufferedWriter(fileWriter); for(int i = 0;i < number;i++) { if(i != 0) bufferWriter.newLine(); bufferWriter.write(users[0][i]); bufferWriter.write(‘ ‘); bufferWriter.write(users[1][i]); bufferWriter.write(‘ ‘); bufferWriter.write(users[2][i]); } bufferWriter.close(); } public static void main(String[] args) throws IOException { String accNum, pass, origBal = "错误!"; int count = 0, menuOption = 0; double depositAmt = 0, withdrawAmt = 0, currentBal = 0; readLength(); String[][] users = new String[3][number]; readUsers(users); do{ System.out.print("请输入账户名:"); accNum = kbd.next(); System.out.print("请输入密码:"); pass = kbd.next(); origBal = checkID(accNum, pass,users); count++; if (count >= 3 && origBal.equals("错误!")){ System.out.print("尝试次数已达上限!"); System.exit(0); } if (!(origBal.equals("错误!"))){ if(isAdmin == false) System.out.println("\n您的余额为 $" + Float.parseFloat(users[2][usernum])); if(isAdmin == true) System.out.println("\n您正以管理员身份登录。"); } else System.out.println(origBal); }while(origBal.equals("错误!")); currentBal=Double.parseDouble(origBal); while (menuOption != 4 && isAdmin == true) { menuOption = adminMenu(); switch (menuOption) { case 1: for (int i = 0; i < number; i++){ System.out.println("用户" + (i + 1) + ": " + users[0][i]); } continue; case 2: users = addUser(users); continue; case 3: deleteUser(users); continue; case 4: System.out.print("\n正在退出……"); remakeFile(users); System.exit(0); break; } } while (menuOption != 4 && isAdmin == false) { menuOption= menu(); switch (menuOption) { case 1: displayBalance(currentBal); continue; case 2: System.out.print("\n请输入您想要存储的数额:$ "); depositAmt = kbd.nextDouble(); if(depositAmt < 0.0) { System.out.print("\n不得进行负存款!"); continue; } currentBal=deposit(depositAmt, currentBal,users); continue; case 3: System.out.print("\n请输入您想要提取的数额:$ "); withdrawAmt = kbd.nextDouble(); while(withdrawAmt > 100.0 || withdrawAmt > currentBal) { System.out.print("错误:一次取款太多!" + "\n请输入较小的数额:$"); withdrawAmt = kbd.nextDouble(); } currentBal = withdraw(currentBal, withdrawAmt,users); continue; case 4: System.out.print("\n正在退出……"); remakeFile(users); System.exit(0); break; } } } }
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