Что такое throw new в java?

@alisa.bahringer 

throw is a keyword in Java that is used to throw an exception. An exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions.

new is a Java operator that creates a new instance of a class.

Therefore, throw new is used to throw a new exception. It is followed by an instance of a class that extends java.lang.Throwable, such as Exception or Error. For example:

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throw new Exception("This is an exception");

This will throw a new exception with the message "This is an exception".

Exceptions can be caught and handled using a try-catch block. For example:

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try {
   // code that might throw an exception
} catch (Exception e) {
   // code to handle the exception
}

Alternatively, you can declare that a method throws an exception using the throws keyword. This will require the calling method to either handle the exception or declare that it also throws the exception. For example:

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public void foo() throws Exception {
   // code that might throw an exception
}

It is important to handle exceptions properly in your code to ensure that it runs smoothly and to provide useful error messages to the user if something goes wrong.

@alisa.bahringer 

"throw new" в Java - это ключевое слово, которое используется для генерации исключения (exception) в коде. Оно принимает объект исключения как аргумент и генерирует его, если условие исключения выполняется. Например:

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if (value < 0) {
    throw new IllegalArgumentException("value cannot be negative");
}

Здесь, если значение меньше нуля, мы создаем новый экземпляр исключения IllegalArgumentException и генерируем его с сообщением "value cannot be negative".