why it doesn't produce assertion error exception

[s sivaraman]

public static void main(String[] args) {
        // TODO code application logic here
        int entered_speed;
        Scanner scanner = new Scanner(System.in);
        System.out.print("enter the speed of the car:");
        entered_speed=Integer.parseInt(scanner.next());
        assert (entered_speed > 0);
        System.out.println("the speed of the train is "+entered_speed);
}

output

enter the speed of the car:-4
the speed of the train is -4

thank you

[Fred Kleinschmidt]

Did you run the program using the -enableassertions flag?

[Rob Spoor]

Or -ea for short.

[s sivaraman]

you want me to do that to enable assertion,dont you?

[Campbell Ritchie]

Remember that assertions are disabled by default.