SimpleFormatter

import java.util.logging.*;

public class SimpleFormatterExample {
    public static void main(String[] args) {
        Logger logger = Logger.getLogger("SimpleLogger");

        // Create a ConsoleHandler
        ConsoleHandler handler = new ConsoleHandler();

        // Set SimpleFormatter (default)
        handler.setFormatter(new SimpleFormatter());

        // Add handler and disable parent
        logger.addHandler(handler);
        logger.setUseParentHandlers(false);

        logger.info("This is an info message.");
        logger.warning("This is a warning message.");
    }
}

import java.io.IOException;
import java.util.logging.*;

class BankAccount {
    private String accountHolder;
    private double balance;
    private Logger logger;

    public BankAccount(String accountHolder) {
        this.accountHolder = accountHolder;
        this.balance = 0.0;

        logger = Logger.getLogger(accountHolder);
        setupLogger();
    }

    private void setupLogger() {
        try {
            FileHandler fileHandler = new FileHandler(accountHolder + "_log.txt", true);
            fileHandler.setFormatter(new SimpleFormatter());
            logger.addHandler(fileHandler);
            logger.setUseParentHandlers(false);  // Prevent console logging
        } catch (IOException e) {
            System.out.println("Logging setup failed: " + e.getMessage());
        }
    }

    public void deposit(double amount) {
        balance += amount;
        logger.info("Deposited: " + amount + " | Balance: " + balance);
    }

    public void withdraw(double amount) {
        if (amount <= balance) {
            balance -= amount;
            logger.info("Withdrawn: " + amount + " | Balance: " + balance);
        } else {
            logger.warning("Withdrawal failed: Insufficient funds. Attempted: " + amount + " | Balance: " + balance);
        }
    }

    public double getBalance() {
        return balance;
    }
}

public class BankTransactionLogger {
    public static void main(String[] args) {
        BankAccount account = new BankAccount("Mahesh");

        account.deposit(1000);
        account.withdraw(400);
        account.withdraw(700);  // Should log a warning
    }
}