做一个简单存钱取钱的存储功能模块。思路如下：
1、数据初始化：当启动main函数的时候，从文本获取初始数据（如：编号，姓名，银行余额等），放入集合里（如：list、map等）。
2、用户可以根据自己的信息在集合查到自己的记录，然后进行存钱取钱操作。
3、当退出的时候，把集合里的信息都反写保存到文本
要求：
代码简单易懂，最好用最基础的知识编写
在以下代码中进行编写改进
public class Test01{
public static void main(String[] args) throws IOException {
//创建字符缓冲输入流对象
BufferedReader br = new BufferedReader(new FileReader("F:\\银行.txt"));
//创建ArrayList集合对象
ArrayList<String> array = new ArrayList();
//调用字符缓冲输入流对象的方法读数据
String line;
while ((line=br.readLine())!=null) {
//把读取到的字符串数据存储到集合中
array.add(line);
}
//释放资源
br.close();
//遍历集合输出
for(String s : array) {
System.out.println(s);
}
}
}
文本文档内容如下：
编号 姓名 性别 银行余额
01 张三 男 1000
02 李四 女 2000
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
public class Test01 {
public static void main(String[] args) throws IOException {
// 创建字符缓冲输入流对象
BufferedReader br = new BufferedReader(new FileReader("F:\\银行.txt"));
// 创建集合存储用户信息
List<Map<String, String>> userList = new ArrayList<>();
// 读取文本文件数据并存储到集合中
String line;
while ((line = br.readLine()) != null) {
String[] userInfo = line.split(" ");
Map<String, String> userMap = new HashMap<>();
userMap.put("编号", userInfo[0]);
userMap.put("姓名", userInfo[1]);
userMap.put("性别", userInfo[2]);
userMap.put("银行余额", userInfo[3]);
userList.add(userMap);
}
// 释放资源
br.close();
// 显示用户信息
for (Map<String, String> user : userList) {
System.out.println(user);
}
// 根据用户输入进行存钱取钱操作
Scanner scanner = new Scanner(System.in);
System.out.print("请输入要进行操作的用户编号：");
String userInput = scanner.nextLine();
Map<String, String> selectedUser = null;
for (Map<String, String> user : userList) {
if (user.get("编号").equals(userInput)) {
selectedUser = user;
break;
}
}
if (selectedUser != null) {
System.out.println("当前用户信息：" + selectedUser);
System.out.println("1. 存钱");
System.out.println("2. 取钱");
System.out.print("请选择操作类型（1或2）：");
int action = scanner.nextInt();
if (action == 1) {
System.out.print("请输入存入金额：");
int depositAmount = scanner.nextInt();
int currentBalance = Integer.parseInt(selectedUser.get("银行余额"));
int newBalance = currentBalance + depositAmount;
selectedUser.put("银行余额", String.valueOf(newBalance));
System.out.println("存钱成功！");
} else if (action == 2) {
System.out.print("请输入取出金额：");
int withdrawAmount = scanner.nextInt();
int currentBalance = Integer.parseInt(selectedUser.get("银行余额"));
if (withdrawAmount > currentBalance) {
System.out.println("余额不足，取钱失败！");
} else {
int newBalance = currentBalance - withdrawAmount;
selectedUser.put("银行余额", String.valueOf(newBalance));
System.out.println("取钱成功！");
}
} else {
System.out.println("无效的操作类型！");
}
} else {
System.out.println("找不到对应编号的用户！");
}
// 保存用户信息到文本文件
BufferedWriter bw = new BufferedWriter(new FileWriter("F:\\银行.txt"));
for (Map<String, String> user : userList) {
StringBuilder sb = new StringBuilder();
sb.append(user.get("编号")).append(" ")
.append(user.get("姓名")).append(" ")
.append(user.get("性别")).append(" ")
.append(user.get("银行余额"));
bw.write(sb.toString());
bw.newLine();
}
// 释放资源
bw.close();
}
}
该回答引用自ChatGPT：根据您提供的代码和需求，我理解您需要编写一个简单的存钱取钱的功能模块，并在程序运行时从文本文件中加载初始数据，然后将更新后的数据保存回文本文件。以下是基于您的思路进行改进的Java代码示例：
import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Test01 {
public static void main(String[] args) {
List<String> array = new ArrayList<>();
try {
// 从文本文件中读取初始数据
BufferedReader br = new BufferedReader(new FileReader("F:\\银行.txt"));
String line;
while ((line = br.readLine()) != null) {
array.add(line);
}
br.close();
} catch (IOException e) {
System.out.println("读取文件出错：" + e.getMessage());
}
// 显示初始数据
System.out.println("初始数据：");
for (String s : array) {
System.out.println(s);
}
// 根据用户信息查找记录，并进行存钱和取钱操作
Scanner scanner = new Scanner(System.in);
System.out.println("请输入您的编号：");
String id = scanner.nextLine();
boolean found = false;
for (int i = 0; i < array.size(); i++) {
String record = array.get(i);
if (record.startsWith(id)) {
found = true;
String[] fields = record.split(" ");
String name = fields[1];
String gender = fields[2];
int balance = Integer.parseInt(fields[3]);
System.out.println("欢迎，" + name + "，您当前的银行余额为：" + balance);
System.out.println("请选择操作：1. 存钱 2. 取钱");
int choice = scanner.nextInt();
if (choice == 1) {
System.out.println("请输入存款金额：");
int deposit = scanner.nextInt();
balance += deposit;
array.set(i, id + " " + name + " " + gender + " " + balance);
System.out.println("存钱成功！当前银行余额为：" + balance);
} else if (choice == 2) {
System.out.println("请输入取款金额：");
int withdrawal = scanner.nextInt();
if (withdrawal <= balance) {
balance -= withdrawal;
array.set(i, id + " " + name + " " + gender + " " + balance);
System.out.println("取钱成功！当前银行余额为：" + balance);
} else {
System.out.println("余额不足，取钱失败！");
}
} else {
System.out.println("无效操作！");
}
break;
}
}
if (!found) {
System.out.println("未找到对应的用户记录！");
}
scanner.close();
// 将更新后的数据保存回文本文件
try {
BufferedWriter bw = new BufferedWriter(new FileWriter("F:\\银行.txt"));
for (String record : array) {
bw.write(record);
bw.newLine();
}
bw.close();
} catch (IOException e) {
System.out.println("保存文件出错：" + e.getMessage());
}
}
}
请注意，上述代码是基于您提供的文本文件格式进行解析和操作的。每一行记录都被视为一个字符串，并按空格分隔为不同字段。您可以根据实际的文本文件格式进行适当的调整。
此代码示例使用ArrayList来存储从文本文件中读取的记录，根据用户输入的编号查找对应的记录，并进行存钱和取钱操作。操作完成后，更新后的数据将保存回文本文件。
请确保文件路径和文件格式的正确性，并根据需要进行适当的错误处理。
import java.io.*;
import java.util.*;
public class Bank {
private static final String FILENAME = "bank.txt"; // 文件名
private Map<String, Double> records; // 存储所有人的记录
public Bank() throws IOException {
File file = new File(FILENAME);
if (file.exists()) { // 如果文件存在，从文件中读取数据
loadRecords();
} else { // 如果文件不存在，创建空白文件
file.createNewFile();
records = new HashMap<>();
}
}
// 从文件中读取记录
private void loadRecords() throws IOException {
BufferedReader reader = new BufferedReader(new FileReader(FILENAME));
records = new HashMap<>();
String line;
while ((line = reader.readLine()) != null) {
String[] parts = line.split(" ");
String name = parts[0];
double balance = Double.parseDouble(parts[1]);
records.put(name, balance);
}
reader.close();
}
// 将记录保存到文件中
public void saveRecords() throws IOException {
BufferedWriter writer = new BufferedWriter(new FileWriter(FILENAME));
for (String name : records.keySet()) {
double balance = records.get(name);
String line = name + " " + balance;
writer.write(line);
writer.newLine();
}
writer.close();
}
// 存钱
public void deposit(String name, double amount) throws Exception {
if (!records.containsKey(name)) {
throw new Exception("No such person");
}
double balance = records.get(name);
balance += amount;
records.put(name, balance);
}
// 取钱
public void withdraw(String name, double amount) throws Exception {
if (!records.containsKey(name)) {
throw new Exception("No such person");
}
double balance = records.get(name);
balance -= amount;
if (balance < 0) {
throw new Exception("Insufficient balance");
}
records.put(name, balance);
}
// 获取余额
public double getBalance(String name) throws Exception {
if (!records.containsKey(name)) {
throw new Exception("No such person");
}
return records.get(name);
}
public static void main(String[] args) throws IOException {
Bank bank = new Bank();
Scanner scanner = new Scanner(System.in);
while (true) {
System.out.println("1. Deposit");
System.out.println("2. Withdraw");
System.out.println("3. Get balance");
System.out.println("4. Quit");
System.out.print("> ");
int choice = scanner.nextInt();
if (choice == 1) {
System.out.print("Name: ");
String name = scanner.next();
System.out.print("Amount: ");
double amount = scanner.nextDouble();
try {
bank.deposit(name, amount);
System.out.println("Deposit successful");
} catch (Exception e) {
System.out.println(e.getMessage());
}
} else if (choice == 2) {
System.out.print("Name: ");
String name = scanner.next();
System.out.print("Amount: ");
double amount = scanner.nextDouble();
try {
bank.withdraw(name, amount);
System.out.println("Withdrawal successful");
} catch (Exception e) {
System.out.println(e.getMessage());
}
} else if (choice == 3) {
System.out.print("Name: ");
String name = scanner.next();
try {
double balance = bank.getBalance(name);
System.out.println("Balance: " + balance);
} catch (Exception e) {
System.out.println(e.getMessage());
}
} else if (choice == 4) {
try {
bank.saveRecords();
System.out.println("Goodbye!");
break;
} catch (Exception e) {
System.out.println("Failed to save records");
}
} else {
System.out.println("Invalid choice");
}
System.out.println();
}
scanner.close();
}
}
这个实现使用了一个 Map<String, Double> 来存储记录，其中键是人的姓名，值是银行余额。在程序启动时，它会尝试从文件中读取数据，如果文件不存在，就创建一个新的空白文件。在程序退出时，它会将所有记录保存回文件中。