java exception override message

In Java, you can override the message of an exception by defining a custom exception class that extends an existing exception class and includes a constructor that sets the message of the exception.

Here's an example of how to override the message of an exception in Java:

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

In this example, a custom exception class called CustomException is defined that extends the Exception class. The CustomException class includes a constructor that takes a String argument and passes it to the super class's constructor using the super keyword.

To use the CustomException class, you can throw an instance of it using the throw statement and pass in a custom message as an argument to the constructor.

try {
    // code that may throw an exception
    throw new CustomException("Custom exception message");
} catch (CustomException ex) {
    System.out.println(ex.getMessage());
}

In this example, an instance of the CustomException class is thrown with a custom message. The CustomException is caught in the catch block and the exception's message is printed using the getMessage() method.

You can use this technique to override the message of any exception in Java by defining a custom exception class that extends the exception class you want to override and includes a constructor that sets the message of the exception.