How do I create a custom checked exception in Java?

How do I create a custom checked exception in Java?

To create a custom checked exception in Java, you need to extend the Exception class. Here's a simple example:

public class MyCheckedException extends Exception {
    public MyCheckedException(String message) {
        super(message);
    }
}

This class can now be thrown and caught like any other checked exception.

Can you show me how to throw this exception?

Sure! You can throw your custom exception using the throw keyword. For example:

public void myMethod() throws MyCheckedException {
    throw new MyCheckedException("This is a custom checked exception.");
}

Make sure to declare it in the method signature.

How do I handle this exception when I call the method?

You can handle the exception using a try-catch block. Here's an example:

try {
    myMethod();
} catch (MyCheckedException e) {
    System.out.println(e.getMessage());
}

This will catch the custom exception and print the message.

Are there any best practices for creating custom exceptions?

Yes, some best practices include:

1. Use meaningful names for your exceptions.
2. Provide constructors that accept messages and cause exceptions.
3. Document your exceptions clearly.