Java實現ATM機操作系統
本文實例為大傢分享瞭Java實現ATM機操作系統的具體代碼，供大傢參考，具體內容如下
用IO流操作txt文件作為數據庫模擬實現一個ATM業務操作系統—->網上銀行，實現登錄，查詢餘額，存款，取款，轉賬，開戶，銷戶等業務功能
看代碼
1.用戶類—–>User:
package atm;
import java.io.Serializable;
public class User implements Serializable{
//建議除瞭私有屬性 無參數有參數構造方法 屬性對應的get、set方法
//建議類實現一個序列化接口 添加一個序列化版本號
private static final long serialVersionUID = 1L;
//隻是為瞭記錄數據庫中的一行信息 賬號 密碼 餘額
private String aName;
private String aPassword;
private Float aSalary;
public User() {}
public User(String aName,String aPassword,Float aSalary) {
this.aName = aName;
this.aPassword = aPassword;
this.aSalary = aSalary;
}
public String getaName() {
return this.aName;
}
public void setaName(String newName) {
this.aName = newName;
}
public String getaPassword() {
return this.aPassword;
}
public void setaPassword(String newPassword) {
this.aPassword = newPassword;
}
public Float getSalary() {
return this.aSalary;
}
public void setSalary(Float newSalary) {
this.aSalary = newSalary;
}
}
2.操作IO的類——>FileLoadAndCommit:
package atm;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
//操作文件
public class FileLoadAndCommit {
//文件路徑
private String pathName = null;
public FileLoadAndCommit(String pathName) {
this.pathName = pathName;
}
//讀取文件裝入集合
public HashMap<String,User> loadFile(){
//臨時的存儲空間，將文件中讀取的數據存儲以便於修改
HashMap<String,User> userBox = new HashMap<String,User>();
//IO流讀取
FileReader fr = null;
BufferedReader br = null;
try {
fr = new FileReader(new File(pathName));
br = new BufferedReader(fr);
String code = br.readLine();//讀取一行
//循環遍歷所有行 按"-"拆分一行的數據，作為User存入集合
while(code != null) {
String[] value = code.split("-");
User user = new User(value[0],value[1],Float.parseFloat(value[2]));
userBox.put(user.getaName(),user);
code = br.readLine();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
//如果流管道存在，才關閉
if(fr != null) {
fr.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if(br != null) {
br.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return userBox;
}
//將集合更新入文件
public void commit(HashMap<String,User> userBox) {
//IO流寫入
FileWriter fw = null;
BufferedWriter bw = null;
try {
fw = new FileWriter(new File(pathName));
bw = new BufferedWriter(fw);
//迭代集合內所有賬戶名 按賬戶名找到對應的User對象
Iterator<String> names = userBox.keySet().iterator();
while(names.hasNext()) {
String name = names.next();
User user = userBox.get(name);
//用StringBuilder拼接字符串
StringBuilder sBuilder = new StringBuilder();
sBuilder.append(user.getaName());
sBuilder.append("-");
sBuilder.append(user.getaPassword());
sBuilder.append("-");
sBuilder.append(user.getSalary());
bw.write(sBuilder.toString());//將拼好的一行數據寫入文件
bw.flush();//刷新
bw.newLine();//換行
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
//必須先關閉BufferedWriter再關閉FileWrite，否賊會拋異常java.io.IOException: Stream closed
try {
if(bw != null) {
bw.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if(fw != null) {
fw.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
3.負責讀寫的類—–>AtmDao:
package atm;
import java.util.HashMap;
//持久化,負責讀寫數據,緩存
public class AtmDao {
private FileLoadAndCommit flac = new FileLoadAndCommit("D:\\test\\ATM\\testATM.txt");
HashMap<String,User> userBox = flac.loadFile();
//獲取一個User對象
public User selectOne(String aName) {
return userBox.get(aName);
}
//更新文件數據
public void update(User user) {
userBox.put(user.getaName(),user);
flac.commit(userBox);
}
//刪除文件數據
public void delete(User user) {
userBox.remove(user.getaName(),user);
flac.commit(userBox);
}
}
4.負責業務邏輯的類——>ATMService:
package atm;
import java.util.HashMap;
//負責業務邏輯 判斷 比較 計算
public class ATMService {
//登錄
private AtmDao dao = new AtmDao();
public String login(String aName,String aPassword) {
User user = dao.selectOne(aName);
if(user!=null) {
if(aPassword.equals(user.getaPassword())) {
return "登錄成功";
}
}
return "用戶名或密碼錯誤";
}
//查詢餘額
public Float inquiry(String aName) {
User user = dao.selectOne(aName);
return user.getSalary();
}
//存款
public void addMoney(String aName,Float addMoney) {
User user = dao.selectOne(aName);//獲取該用戶對象
user.setSalary(user.getSalary()+addMoney);//用User的set方法修改用戶金額
dao.update(user);//更新文件數據
System.out.println("存款成功\n");
}
//取款
public void getMoney(String aName,Float getMoney) {
User user = dao.selectOne(aName);//獲取該用戶對象
if(getMoney <= user.getSalary()) {//如果要取出的錢大於餘額就不能取瞭
user.setSalary(user.getSalary()-getMoney);
dao.update(user);
System.out.println("取款成功\n");
}else {
System.out.println("對不起,您的餘額不足\n");
}
}
//轉賬
public void transferMoney(String outName,String inName,Float transferMoney) {
User outUser = dao.selectOne(outName);//轉出用戶
User inUser = dao.selectOne(inName);//轉入用戶
if(inUser!=null) {//轉入用戶存在
if(outUser!=inUser) {//轉出和轉入用戶不能是同一個用戶
if(transferMoney <= outUser.getSalary()) {//轉出金額大於餘額就不能轉瞭
outUser.setSalary(outUser.getSalary()-transferMoney);//修改轉出用戶餘額
inUser.setSalary(inUser.getSalary()+transferMoney);//修改轉入用戶餘額
//更新文件數據
dao.update(outUser);
dao.update(inUser);
System.out.println("轉賬成功\n");
}else {
System.out.println("對不起"+outName+",您的餘額不足\n");
}
}else {
System.out.println("對不起,不能給自己轉賬,您可以試試使用存款業務\n");
}
}else {
System.out.println("對不起,您輸入的用戶不存在\n");
}
}
//開戶
public User creatUser(String aName,String aPassword,Float aSalary) {
User user = new User(aName,aPassword,aSalary);
dao.update(user);//更新文件數據
System.out.println("用戶"+aName+",創建成功");
return user;
}
//銷戶
public void deleteUser(String aName) {
User user = dao.selectOne(aName);//獲取名為aName的用戶
if(user != null) {//判斷該用戶是否在文件數據內存在
dao.delete(user);
System.out.println("用戶"+aName+",刪除成功");
}else {
System.out.println("要銷毀的賬戶不存在");
}
}
}
5.測試類—–>TestMain:
package atm;
import java.util.Scanner;
public class TestMain {
public static void main(String[] args) {
ATMService atmService = new ATMService();//獲取執行業務的方法
Scanner input = new Scanner(System.in);
System.out.println("歡迎進入ATM機系統");
System.out.println("請選擇要操作的業務:\n1.用戶登錄\n2.開戶\n3.按任意鍵退出");
String choice = input.next();
if(choice.equals("1")) {
System.out.println("請輸入賬戶名");
String name = input.next();
System.out.println("請輸入密碼");
String password = input.next();
String afterLogin = atmService.login(name,password);//判斷輸入的賬戶名密碼是否正確
if(afterLogin.equals("登錄成功")) {//if正確則登錄成功
System.out.println("登錄成功！\n");
//使用while循環反復進行switch執行操作業務
while(true) {
System.out.println("請選擇服務項目:");
System.out.println("1.查詢\n2.存款\n3.取款\n4.轉賬\n5.銷戶\n(按q退出系統)");
String option = input.next();
switch (option) {
case "1":
//查詢
Float money = atmService.inquiry(name);
System.out.println("尊敬的客戶,您的餘額為"+money+"元\n");
break;
case "2":
//存款
System.out.println("請輸入存款金額");
Float addMoney = input.nextFloat();
atmService.addMoney(name,addMoney);
break;
case "3":
//取款
System.out.println("請輸入取款金額");
Float getMoney = input.nextFloat();
atmService.getMoney(name,getMoney);
break;
case "4":
//轉賬
System.out.println("請輸入轉賬用戶ID:");
String id = input.next();
System.out.println("請輸入轉賬金額:");
Float transferMoney = input.nextFloat();
atmService.transferMoney(name,id,transferMoney);
break;
case"5":
//銷戶
System.out.println("您確定要銷毀當前賬戶嗎?賬戶內所有餘額都會消失\nYes/No\n");
String decision = input.next();
if(decision.equalsIgnoreCase("yes")) {
atmService.deleteUser(name);//刪除當前user數據
}else if(decision.equalsIgnoreCase("no")){
break;
}
break;
case "q":
System.out.println("已退出ATM機系統,感謝您的使用!!!");
System.exit(0);//退出程序
break;
default:
System.out.println("請輸入正確的指令\n");
break;
}
}
}else {
System.out.println(afterLogin);
}
}else if(choice.equals("2")){
//開戶
System.out.println("請設置您的用戶名");
String newUserName = input.next();
System.out.println("請設置您的密碼");
String newPassword = input.next();
User newUser = atmService.creatUser(newUserName, newPassword, 0.0F);
System.out.println("\n初始餘額為"+newUser.getSalary()+"元");
}else {
System.out.println("已退出ATM機系統,感謝您的使用!!!");
}
}
}
部分運行結果：
1.賬戶登錄
2.查詢
3.存款
4.退出
作為數據庫的txt文件：
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。