Custom Exception

title: Custom Exception in Java description: Apni exception class banana

Apni business logic ke hisaab se exceptions banana.

Unchecked Custom Exception

java exampleWoHoTech

class InsufficientFundsException extends RuntimeException {
    private double amount;

    InsufficientFundsException(double amount) {
        super("Insufficient funds. Needed: " + amount);
        this.amount = amount;
    }

    double getAmount() { return amount; }
}

Checked Custom Exception

java exampleWoHoTech

class InvalidAgeException extends Exception {
    private int age;

    InvalidAgeException(int age) {
        super("Invalid age: " + age + ". Must be between 0-120.");
        this.age = age;
    }

    int getAge() { return age; }
}

Use karna

java exampleWoHoTech

class BankAccount {
    private double balance = 1000;

    void withdraw(double amount) {
        if (amount > balance) {
            throw new InsufficientFundsException(amount - balance);
        }
        balance -= amount;
        System.out.println("Withdrawn: " + amount);
    }
}

// Usage
try {
    BankAccount acc = new BankAccount();
    acc.withdraw(1500); // Exception aayegi
} catch (InsufficientFundsException e) {
    System.out.println(e.getMessage());
    System.out.println("Needed extra: " + e.getAmount());
}

Best Practices

Meaningful naam rakho
Message clear rakho
Extra information provide karo getters se
Checked exception sirf tab jab caller handle kar sake

title: Custom Exception in Java description: Apni exception class banana

Apni business logic ke hisaab se exceptions banana.

Unchecked Custom Exception

java exampleWoHoTech

class InsufficientFundsException extends RuntimeException {
    private double amount;

    InsufficientFundsException(double amount) {
        super("Insufficient funds. Needed: " + amount);
        this.amount = amount;
    }

    double getAmount() { return amount; }
}

Checked Custom Exception

java exampleWoHoTech

class InvalidAgeException extends Exception {
    private int age;

    InvalidAgeException(int age) {
        super("Invalid age: " + age + ". Must be between 0-120.");
        this.age = age;
    }

    int getAge() { return age; }
}

Use karna

java exampleWoHoTech

class BankAccount {
    private double balance = 1000;

    void withdraw(double amount) {
        if (amount > balance) {
            throw new InsufficientFundsException(amount - balance);
        }
        balance -= amount;
        System.out.println("Withdrawn: " + amount);
    }
}

// Usage
try {
    BankAccount acc = new BankAccount();
    acc.withdraw(1500); // Exception aayegi
} catch (InsufficientFundsException e) {
    System.out.println(e.getMessage());
    System.out.println("Needed extra: " + e.getAmount());
}

Best Practices

Meaningful naam rakho
Message clear rakho
Extra information provide karo getters se
Checked exception sirf tab jab caller handle kar sake

Custom Exception

Unchecked Custom Exception

Checked Custom Exception

Use karna

Best Practices

Continue learning this concept

Custom Exception

Unchecked Custom Exception

Checked Custom Exception

Use karna

Best Practices

Continue learning this concept