Assertions - General Questions

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        int x = -1;
        assert x > 0 : "negative";
        System.out.println("done");
    }
}

Which of these is a valid assert statement?

Since which Java version has assert been a keyword?

What is the correct syntax for an assertion with a message?

Which exception is thrown when an assertion fails?