Какова основной функция оператора throw в языках программирования, и в чем его отличие от других методов обработки ошибок?

The throw operator is used to explicitly throw an exception during program execution. Its main function is to signal the occurrence of an error or exceptional situation, interrupting the normal flow of execution and passing control to the nearest exception handler (catch).

The difference between throw and other error handling methods, such as returning error codes or using conditional statements, is that throw allows centralized and structured error handling, separating error processing logic from the main program logic. This simplifies code readability and maintenance, and also prevents errors from spreading unchecked.

Example in Java:

if (user == null) {
    throw new IllegalArgumentException("User cannot be null");
}

Here, when an error is detected, an exception is thrown, which can be caught and handled elsewhere in the program.