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這篇“Java如何實(shí)現(xiàn)ATM機(jī)操作系統(tǒng)”文章的知識(shí)點(diǎn)大部分人都不太理解，所以小編給大家總結(jié)了以下內(nèi)容，內(nèi)容詳細(xì)，步驟清晰，具有一定的借鑒價(jià)值，希望大家閱讀完這篇文章能有所收獲，下面我們一起來(lái)看看這篇“Java如何實(shí)現(xiàn)ATM機(jī)操作系統(tǒng)”文章吧。
用IO流操作txt文件作為數(shù)據(jù)庫(kù)模擬實(shí)現(xiàn)一個(gè)ATM業(yè)務(wù)操作系統(tǒng)---->網(wǎng)上銀行，實(shí)現(xiàn)登錄，查詢余額，存款，取款，轉(zhuǎn)賬，開戶，銷戶等業(yè)務(wù)功能
1.用戶類----->User:
package atm;
import java.io.Serializable;
public class User implements Serializable{
//建議除了私有屬性 無(wú)參數(shù)有參數(shù)構(gòu)造方法 屬性對(duì)應(yīng)的get、set方法
//建議類實(shí)現(xiàn)一個(gè)序列化接口 添加一個(gè)序列化版本號(hào)
private static final long serialVersionUID = 1L;
//只是為了記錄數(shù)據(jù)庫(kù)中的一行信息 賬號(hào) 密碼 余額
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(shí)的存儲(chǔ)空間，將文件中讀取的數(shù)據(jù)存儲(chǔ)以便于修改
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(huán)遍歷所有行 按"-"拆分一行的數(shù)據(jù)，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(guān)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(nèi)所有賬戶名 按賬戶名找到對(duì)應(yīng)的User對(duì)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(shù)據(jù)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(guān)閉BufferedWriter再關(guān)閉FileWrite，否賊會(huì)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(fù)責(zé)讀寫的類----->AtmDao:
package atm;
import java.util.HashMap;
//持久化,負(fù)責(zé)讀寫數(shù)據(jù),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(gè)User對(duì)象
public User selectOne(String aName) {
return userBox.get(aName);
}
//更新文件數(shù)據(jù)
public void update(User user) {
userBox.put(user.getaName(),user);
flac.commit(userBox);
}
//刪除文件數(shù)據(jù)
public void delete(User user) {
userBox.remove(user.getaName(),user);
flac.commit(userBox);
}
}4.負(fù)責(zé)業(yè)務(wù)邏輯的類------>ATMService:
package atm;
import java.util.HashMap;
//負(fù)責(zé)業(yè)務(wù)邏輯 判斷 比較 計(jì)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(cuò)誤";
}
//查詢余額
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(duì)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(shù)據(jù)
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(duì)象
if(getMoney <= user.getSalary()) {//如果要取出的錢大于余額就不能取了
user.setSalary(user.getSalary()-getMoney);
dao.update(user);
System.out.println("取款成功\n");
}else {
System.out.println("對(duì)不起,您的余額不足\n");
}
}
//轉(zhuǎn)賬
public void transferMoney(String outName,String inName,Float transferMoney) {
User outUser = dao.selectOne(outName);//轉(zhuǎn)出用戶
User inUser = dao.selectOne(inName);//轉(zhuǎn)入用戶
if(inUser!=null) {//轉(zhuǎn)入用戶存在
if(outUser!=inUser) {//轉(zhuǎn)出和轉(zhuǎn)入用戶不能是同一個(gè)用戶
if(transferMoney <= outUser.getSalary()) {//轉(zhuǎn)出金額大于余額就不能轉(zhuǎn)了
outUser.setSalary(outUser.getSalary()-transferMoney);//修改轉(zhuǎn)出用戶余額
inUser.setSalary(inUser.getSalary()+transferMoney);//修改轉(zhuǎn)入用戶余額
//更新文件數(shù)據(jù)
dao.update(outUser);
dao.update(inUser);
System.out.println("轉(zhuǎn)賬成功\n");
}else {
System.out.println("對(duì)不起"+outName+",您的余額不足\n");
}
}else {
System.out.println("對(duì)不起,不能給自己轉(zhuǎn)賬,您可以試試使用存款業(yè)務(wù)\n");
}
}else {
System.out.println("對(duì)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(shù)據(jù)
System.out.println("用戶"+aName+",創(chuàng)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(shù)據(jù)內(nèi)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(cè)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(zhí)行業(yè)務(wù)的方法
Scanner input = new Scanner(System.in);
System.out.println("歡迎進(jìn)入ATM機(jī)系統(tǒng)");
System.out.println("請(qǐng)選擇要操作的業(yè)務(wù):\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(qǐng)輸入賬戶名");
String name = input.next();
System.out.println("請(qǐng)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(huán)反復(fù)進(jìn)行switch執(zhí)行操作業(yè)務(wù)
while(true) {
System.out.println("請(qǐng)選擇服務(wù)項(xiàng)目:");
System.out.println("1.查詢\n2.存款\n3.取款\n4.轉(zhuǎn)賬\n5.銷戶\n(按q退出系統(tǒng))");
String option = input.next();
switch (option) {
case "1":
//查詢
Float money = atmService.inquiry(name);
System.out.println("尊敬的客戶,您的余額為"+money+"元\n");
break;
case "2":
//存款
System.out.println("請(qǐng)輸入存款金額");
Float addMoney = input.nextFloat();
atmService.addMoney(name,addMoney);
break;
case "3":
//取款
System.out.println("請(qǐng)輸入取款金額");
Float getMoney = input.nextFloat();
atmService.getMoney(name,getMoney);
break;
case "4":
//轉(zhuǎn)賬
System.out.println("請(qǐng)輸入轉(zhuǎn)賬用戶ID:");
String id = input.next();
System.out.println("請(qǐng)輸入轉(zhuǎn)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(dāng)前賬戶嗎?賬戶內(nèi)所有余額都會(huì)消失\nYes/No\n");
String decision = input.next();
if(decision.equalsIgnoreCase("yes")) {
atmService.deleteUser(name);//刪除當(dāng)前user數(shù)據(jù)
}else if(decision.equalsIgnoreCase("no")){
break;
}
break;
case "q":
System.out.println("已退出ATM機(jī)系統(tǒng),感謝您的使用!!!");
System.exit(0);//退出程序
break;
default:
System.out.println("請(qǐng)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(qǐng)?jiān)O(shè)置您的用戶名");
String newUserName = input.next();
System.out.println("請(qǐng)?jiān)O(shè)置您的密碼");
String newPassword = input.next();
User newUser = atmService.creatUser(newUserName, newPassword, 0.0F);
System.out.println("\n初始余額為"+newUser.getSalary()+"元");
}else {
System.out.println("已退出ATM機(jī)系統(tǒng),感謝您的使用!!!");
}
}
}部分運(yùn)行結(jié)果：
1.賬戶登錄
2.查詢
3.存款
4.退出
作為數(shù)據(jù)庫(kù)的txt文件：
以上就是關(guān)于“Java如何實(shí)現(xiàn)ATM機(jī)操作系統(tǒng)”這篇文章的內(nèi)容，相信大家都有了一定的了解，希望小編分享的內(nèi)容對(duì)大家有幫助，若想了解更多相關(guān)的知識(shí)內(nèi)容，請(qǐng)關(guān)注億速云行業(yè)資訊頻道。
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