bench.java

    private static final Method nop1;
    private static final MethodHandle nop2;
    private static final MethodHandle nop3;

    static {
        Method _nop1 = null;
        MethodHandle _nop2 = null;
        MethodHandle _nop3 = null;
        try {
            _nop1 = Hello.class.getMethod("nop", long.class);
            _nop2 = lookup.unreflect(_nop1);
            _nop3 = MethodHandles.insertArguments(_nop2, 0, 1L);
        } catch (Exception e) {}

        nop1 = _nop1;
        nop2 = _nop2;
        nop3 = _nop3;
    }

    public static void main(String[] args) throws Throwable {
        MethodHandle nop2 = lookup.unreflect(nop1);
        while (true) {
            long t = System.nanoTime();
            for (int i = 0; i < 100_000_000; i++) {
                nop2.invokeExact(1L);
            }
            System.out.println("invoke: " + (System.nanoTime() - t));

//            long t = System.nanoTime();
//            for (int i = 0; i < 100_000_000; i++) {
//                nop1.invoke(null, 1L);
//            }
//            System.out.println("reflect: " + (System.nanoTime() - t));

//            long t = System.nanoTime();
//            for (int i = 0; i < 100_000_000; i++) {
//                nop3.invoke();
//            }
//            System.out.println("invoke2: " + (System.nanoTime() - t));

//            long t = System.nanoTime();
//            for (int i = 0; i < 100_000_000; i++) {
//                nop(1L);
//            }
//            System.out.println("direct: " + (System.nanoTime() - t));
        }
    }

    private static long counter = 0;

    public static void nop(long inc) {
        counter += inc;
    }