ArrayList集合模拟实现ATM系统
1 //定义账户类，封装用户的账户信息
2 public class Account {
3 private String id; //卡号
4 private String name; //姓名
5 private String password; //密码
6 private double balance; //余额
7 private double quota; //限额
8
9 public Account() {
10 }
11
12 public Account(String id, String name, String password, double balance, double quota) {
13 this.id = id;
14 this.name = name;
15 this.password = password;
16 this.balance = balance;
17 this.quota = quota;
18 }
19
20 public String getId() {
21 return id;
22 }
23
24 public void setId(String id) {
25 this.id = id;
26 }
27
28 public String getName() {
29 return name;
30 }
31
32 public void setName(String name) {
33 this.name = name;
34 }
35
36 public String getPassword() {
37 return password;
38 }
39
40 public void setPassword(String password) {
41 this.password = password;
42 }
43
44 public double getBalance() {
45 return balance;
46 }
47
48 public void setBalance(double balance) {
49 this.balance = balance;
50 }
51
52 public double getQuota() {
53 return quota;
54 }
55
56 public void setQuota(double quota) {
57 this.quota = quota;
58 }
59 }
系统页：
1 public class ATMSystem {
2 public static void main(String[] args) {
3 //定义一个ArrayList集合用于存放每一个账户对象
4 ArrayList<Account> accounts = new ArrayList<>();
5
6 //首页：登录、开户
7 showMain(accounts);
8 }
9
10 public static void showMain(ArrayList<Account> accounts){
11 System.out.println("###########欢迎来到首页#############");
12 System.out.println("请选择：");
13 System.out.println("1、登录");
14 System.out.println("2、开户");
15 Scanner sc = new Scanner(System.in);
16 Random rand = new Random();
17 while (true) {
18 String input = sc.next();
19 switch (input){
20 case "1":
21 //登录
22 login(accounts,sc);
23 break;
24
25 case "2":
26 //开户
27 register(accounts,sc,rand);
28 break;
29 default:
30 System.out.println("您的操作不被支持,请重新选择");
31 }
32 }
33 }
34
35 private static void register(ArrayList<Account> accounts, Scanner sc, Random rand) {
36 //创建Account对象，封装用户数据
37 Account account = new Account();
38 System.out.println("###########注册界面############");
39 //循环11次随机生成卡号
40 String id = "";
41 String allNumbers = "0123456789";
42 while (true) {
43 for (int i = 0; i < 11; i++) {
44 int eachRandom = rand.nextInt(10); //随机数0--9
45 id += allNumbers.charAt(eachRandom);
46 }
47 //查询是否与系统卡号相同
48 boolean ret = idisRepetition(accounts,id);
49 if(!ret){
50 account.setId(id); //设置卡号
51 break;
52 }
53 }
54 System.out.println("请输入您的姓名：");
55 String inputName = sc.next();
56 account.setName(inputName); //设置姓名
57 while (true) {
58 System.out.println("请输入开户密码：");
59 String inputPassword = sc.next();
60 System.out.println("确认密码：");
61 String affirmPassword = sc.next();
62 //检查两次密码输入是否一致
63 if(inputPassword.equals(affirmPassword)){
64 //说明两次密码输入一致，可以作为账户密码，随便一个密码即可
65 account.setPassword(inputPassword); //设置密码
66 break;
67 }
68 else {
69 System.out.println("两次密码输入不一致，请重新设置");
70 }
71 }
72 System.out.println("请输入单次取现额度：");
73 double inputQuota = sc.nextDouble();
74 account.setQuota(inputQuota); //设置单次取现额度
75
76 //把account对象添加到ArrayList集合中去
77 accounts.add(account);
78
79 //提示用户开户成功：
80 System.out.println("#######开户成功########");
81 System.out.println("您的卡号为：" + account.getId() + ",请妥善保管");
82
83 //跳转到登录界面让用户登录
84 showMain(accounts);
85 }
86
87 private static boolean idisRepetition(ArrayList<Account> accounts, String id){
88 for (int i = 0; i < accounts.size(); i++) {
89 //说明有重复的卡号
90 if(id.equals(accounts.get(i).getId())){
91 return true;
92 }
93 }
94 return false; //说明没有重复的卡号
95 }
96
97 private static void login(ArrayList<Account> accounts, Scanner sc) {
98 System.out.println("###########登录界面###########");
99 while (true) {
100 System.out.println("请输入卡号：");
101 String inputId = sc.next();
102 System.out.println("请输入密码：");
103 String inputPassword = sc.next();
104 //根据用户输入的卡号和密码从accounts集合中查找该账户
105 //创建Account账户类对象接收查询结果，该结果用于后期该账户对象的详细信息
106 Account ret = searchIdAndPwdFromAccounts(accounts,inputId,inputPassword);
107 if(ret == null){
108 System.out.println("登录失败(可能原因):账户不存在 || 用户名、密码输入错误");
109 showMain(accounts);
110 }
111 else {
112 System.out.println("登录成功");
113 System.out.println("当前账户为：" + ret.getId());
114 //登录成功之后展示用户操作界面
115 showUserCommand(ret,sc,accounts);
116 //用户选择退出账户即把showUserCommand干掉，然后展示首页
117 showMain(accounts);
118 }
119 }
120 }
121
122 private static void showUserCommand(Account account, Scanner sc, ArrayList<Account> accounts) {
123 System.out.println("###########用户操作界面###########");
124 while (true) {
125 System.out.println("请选择交易类型:");
126 System.out.println("1、查询账户详细信息");
127 System.out.println("2、存款");
128 System.out.println("3、取款");
129 System.out.println("4、转账");
130 System.out.println("5、修改密码");
131 System.out.println("6、退出");
132 System.out.println("7、注销账户");
133 int input = sc.nextInt();
134 switch (input){
135 case 1:
136 //展示用户详细信息;
137 showUserDetail(account);
138 break;
139 case 2:
140 //存款
141 saveMoney(account,sc);
142 break;
143 case 3:
144 //取款
145 withdrawl(account,sc);
146 break;
147 case 4:
148 //转账
149 transferAccounts(accounts,account,sc);
150 break;
151 case 5:
152 //修改密码
153 modifyPassword(account,sc);
154 break;
155 case 6:
156 //退出
157 System.out.println("退出系统");
158 return;
159 case 7:
160 //注销账户
161 removeAccount(accounts,account);
162 return;
163 //break;
164 default:
165 System.out.println("当前操作不被支持，请重新选择");
166 }
167 }
168 }
169
170 //注销账户
171 private static void removeAccount(ArrayList<Account> accounts, Account account) {
172 accounts.remove(account);
173 System.out.println("该账户已被注销");
174 }
175
176 //修改密码
177 private static void modifyPassword(Account account, Scanner sc) {
178 System.out.println("##########修改密码界面############");
179 while (true) {
180 System.out.println("请输入原来的密码进行确认");
181 String laterPassword = sc.next();
182 if(laterPassword.equals(account.getPassword())){
183 while (true){
184 if(laterPassword.equals(account.getPassword())){
185 //相等
186 System.out.println("请输入新密码：");
187 String modifyPassword = sc.next();
188 System.out.println("确认新密码：");
189 String repetitionPassword = sc.next();
190 if(modifyPassword.equals(repetitionPassword)){
191 //两次密码输入一致
192 account.setPassword(modifyPassword);
193 System.out.println("密码修改成功");
194 return;
195 }
196 else {
197 System.out.println("两次密码输入不一致,请重新设置");
198 break;
199 }
200 }
201 }
202 }
203 else {
204 System.out.println("密码输入有误,请重新输入");
205 }
206 }
207 }
208
209 //转账
210 private static void transferAccounts(ArrayList<Account> accounts, Account account, Scanner sc) {
211 System.out.println("###########转账界面##############");
212 while (true) {
213 System.out.println("请输入对方账户的卡号：");
214 String inputId = sc.next();
215 //根据卡号在账户类集合中查找是否存在该账户,ret为对方账户对象,account为自己账户对象
216 Account ret = searchIdFromAccounts(accounts,inputId);
217 if(ret == null){
218 System.out.println("当前系统不存在该账户");
219 }
220 else {
221 //确认对方账户姓名:
222 String name = ret.getName();
223 String shieldName = name.substring(1);
224 System.out.println("请输入对方的姓氏进行确认：" + "*" + shieldName);
225 String familyName = sc.next();
226 if(name.startsWith(familyName)){
227 //确认成功,开始进行转账操作
228 System.out.println("请输入转账金额：");
229 double transferMoney = sc.nextDouble();
230 if(transferMoney > account.getBalance()){
231 System.out.println("余额不足，当前账户余额为：" + account.getBalance());
232 System.out.println("请重新输入转账金额");
233 }
234 else {
235 if(transferMoney > account.getQuota()){
236 System.out.println("单次转账额度大于限额，转账失败！" + "单次取现额度为：" + account.getQuota());
237 System.out.println("请重新输入转账金额");
238 }
239 else {
240 account.setBalance(account.getBalance() - transferMoney); //当前账户：原余额 - 取走的钱
241 ret.setBalance(ret.getBalance() + transferMoney); //对方账户： 原余额 + 存入的钱
242 System.out.println("已成功转账");
243 System.out.println("当前账户余额为：" + account.getBalance());
244 break;
245 }
246 }
247 }
248 else {
249 System.out.println("姓氏错误,请重新输入");
250 }
251 }
252 }
253 }
254
255 //根据卡号查找账户
256 private static Account searchIdFromAccounts(ArrayList<Account> accounts, String inputId) {
257 for (int i = 0; i < accounts.size(); i++) {
258 if(inputId.equals(accounts.get(i).getId())){
259 //说明存在该账户对象
260 return accounts.get(i);
261 }
262 }
263 return null;
264 }
265
266 //取款
267 private static void withdrawl(Account account, Scanner sc) {
268 System.out.println("#########取款页面###########");
269 System.out.println("请输入取款金额：");
270 while (true) {
271 double withdrawlMoney = sc.nextDouble();
272 if(withdrawlMoney > account.getBalance()){
273 System.out.println("余额不足，当前账户余额为：" + account.getBalance());
274 System.out.println("请重新输入取款金额");
275 }
276 else {
277 if(withdrawlMoney > account.getQuota()){
278 System.out.println("单次取现额度大于限额，取款失败！" + "单次取现额度为：" + account.getQuota());
279 System.out.println("请重新输入取款金额");
280 }
281 else {
282 account.setBalance(account.getBalance() - withdrawlMoney); //原余额 - 取走的钱
283 System.out.println("已成功取款");
284 System.out.println("当前账户余额为：" + account.getBalance());
285 break;
286 }
287 }
288 }
289
290 }
291
292 //存款
293 private static void saveMoney(Account account,Scanner sc) {
294 System.out.println("###########存款页面############");
295 System.out.println("请输入您要存入的金额：");
296 double saveMoney = sc.nextDouble();
297 account.setBalance(account.getBalance() + saveMoney); //余额加存入的钱
298 System.out.println("存款完成！");
299 System.out.println("当前账户余额为：" + account.getBalance());
300 }
301
302 //账户详情:根据账户对象得出
303 private static void showUserDetail(Account account) {
304 System.out.println("##########账户详情页##########");
305 System.out.println("卡号：" + account.getId());
306 System.out.println("姓名：" + account.getName());
307 System.out.println("余额：" + account.getBalance());
308 System.out.println("单次交易限额：" + account.getQuota());
309 }
310
311 //通过卡号和密码从accounts集合中查找该账户对象
312 private static Account searchIdAndPwdFromAccounts(ArrayList<Account> accounts, String inputId, String inputPassword) {
313 for (int i = 0; i < accounts.size(); i++) {
314 if(accounts.get(i).getId().equals(inputId) && accounts.get(i).getPassword().equals(inputPassword)){
315 //说明存在该账户
316 return accounts.get(i);
317 }
318 }
319 return null;
320 }
321 }
运行示例（由于功能较为繁杂，在此只罗列出大概的功能）：
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