Notes

package PoemsFromPensPackage;
import java.io.*;
import java.util.*;
public class VirtualBank {
private static int countofAccount = 0;
private int ID;
private double balance;
private String username;
private String password;
public VirtualBank(int ID) {
this.ID = ID;
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader("virtualBankAccounts.txt"));
String line;
while ((line = reader.readLine()) != null) {
String[] accountData = line.split(",");
int accountID = Integer.parseInt(accountData[0]);
if (accountID == ID) {
this.username = accountData[1];
this.password = accountData[2];
this.balance = Double.parseDouble(accountData[3]);
break;
}
}
} catch (IOException | NumberFormatException e) {
e.printStackTrace();
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public VirtualBank(String username, String password) {
this.username = username;
this.balance = 0;
this.password = password;
this.createAccount();
}
private void createAccount() {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter("virtualBankAccounts.txt", true));
int maxID = getMaxID();
this.ID = maxID + 1;
writer.write("n" + this.ID + "," + this.username + "," + this.password + "," + this.balance);
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (writer != null) {
writer.close();
this.ID = VirtualBank.countofAccount;
VirtualBank.countofAccount++;
}
}
catch (IOException e) {
e.printStackTrace();
}
}
}
public void deposit(double balance) {
this.setBalance(this.balance + balance);
this.information(true);
}
public void transfer(double thisBalance, VirtualBank toThisBank) {
if (thisBalance <= this.balance) {
this.setBalance(this.getBalance() - thisBalance);
toThisBank.setBalance(toThisBank.getBalance() + thisBalance);
this.information(true);
}
else {
this.information(false);
}
}
public void purchase(double balance) {
if (balance <= this.balance) {
this.setBalance(this.balance - balance);
this.information(true);
}
else {
this.information(false);
}
}
private void information(boolean OP) {
if (OP == true) {
System.out.println("Your transaction has been completed successfully");
}
else if (OP == false) {
System.out.println("Your transaction ended unsuccessfully");
}
else {
System.out.println("Unknown error");
}
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
writeToFile(this.ID, 1, this.getUsername());
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
writeToFile(this.ID, 2, this.getPassword());
}
public int getID() {
return this.ID;
}
public double getBalance() {
return balance;
}
private void setBalance(double balance) {
this.balance = balance;
String strValue = String.valueOf(this.balance);
writeToFile(this.ID, 3, strValue);
}
@Override
public String toString() {
return "Username: " + this.username + "nBalance: " + this.balance + "nPassword: " + this.password + "nID: " + this.ID;
}
private static int getMaxID() {
int maxID = 0;
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader("virtualBankAccounts.txt"));
String line;
while ((line = reader.readLine()) != null) {
String[] accountData = line.split(",");
int accountID = Integer.parseInt(accountData[0]);
if (accountID > maxID) {
maxID = accountID;
}
}
}
catch (IOException | NumberFormatException e) {
e.printStackTrace();
}
finally {
try {
if (reader != null) {
reader.close();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
return maxID;
}
private void writeToFile(int ID, int index, String element) {
BufferedReader reader = null;
BufferedWriter writer = null;
ArrayList<String> data = new ArrayList<>();
try {
String line;
reader = new BufferedReader(new FileReader("virtualBankAccounts.txt"));
while ((line = reader.readLine()) != null) {
data.add(line);
}
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (reader != null) {
reader.close();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
try {
writer = new BufferedWriter(new FileWriter("virtualBankAccounts.txt"));
for (String rowData : data) {
String[] accountData = rowData.split(",");
if (Integer.parseInt(accountData[0]) == ID) {
switch (index) {
case 1:
accountData[1] = element;
break;
case 2:
accountData[2] = element;
break;
case 3:
accountData[3] = element;
break;
default:
System.out.println("Invalid index!");
break;
}
}
writer.write(String.join(",", accountData));
writer.newLine();
}
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
if (writer != null) {
writer.close();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}