public class JitDemo {
    static int square(int x) { return x * x; }

    public static void main(String[] args) {
        System.out.println("java.version      = " + System.getProperty("java.version"));
        System.out.println("java.vm.name      = " + System.getProperty("java.vm.name"));
        System.out.println("java.class.version= " + System.getProperty("java.class.version"));
        System.out.println("Runtime.version() = " + Runtime.version());
        long sum = 0;
        for (int i = 0; i < 200_000; i++) {
            sum += square(i);
        }
        System.out.println("sum = " + sum);
    }
}