Java Exception Handling Best Practices

Proper exception handling is crucial for robust Java applications. Here’s how to handle exceptions effectively:

import java.io.FileReader;
import java.io.IOException;

public class ExceptionExample {
    public void readFile(String fileName) {
        try (FileReader reader = new FileReader(fileName)) {
            // File processing logic
            int character;
            while ((character = reader.read()) != -1) {
                System.out.print((char) character);
            }
        } catch (IOException e) {
            System.err.println("Error reading file: " + e.getMessage());
            // Log the exception properly in real applications
        }
    }
}

Creating custom exceptions for better error handling:

public class InsufficientFundsException extends Exception {
    private final double amount;
    private final double balance;

    public InsufficientFundsException(double amount, double balance) {
        super(String.format("Insufficient funds: tried to withdraw %.2f, balance is %.2f",
              amount, balance));
        this.amount = amount;
        this.balance = balance;
    }

    public double getAmount() { return amount; }
    public double getBalance() { return balance; }
}

public class BankAccount {
    private double balance;

    public void withdraw(double amount) throws InsufficientFundsException {
        if (amount > balance) {
            throw new InsufficientFundsException(amount, balance);
        }
        balance -= amount;
    }
}

Best practices include using try-with-resources for automatic resource management and creating specific exception types for different error scenarios.

javac *.java && java ExceptionExample

# Java Exception Handling Best Practices

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