class TestStackedConcats {

    public static void main(String... args) {
        for (int i = 0; i < 1000; i++) {
            for (int j = 0; j < 1000; j++) {;}
            String s = "";
            s = new StringBuilder().toString();
            s = new StringBuilder(String.valueOf(s)).append(String.valueOf(s)).toString();
        }
    }

}