public class Main {
    public int param;

    public static void main(String[] args) {
        try {
            Main a = Main.class.getConstructor().newInstance();
            System.out.println("finished, param = " + a.param);
        } catch (Exception ex) {
            System.out.println("exception thrown");
        }
    }

    public Main() {
        this(-1);
        System.out.println("constr default");
    }

    public Main(int param) {
        System.out.println("constr param = " + param);
        this.param = param;
    }
}