1
2public class Main {
3    static class SuperClass {
4      protected static int getVar(int w) {
5          return w & 0xF;
6      }
7    }
8    static class SubClass extends SuperClass {
9      final int getVarDirect(int w) {
10        return w & 0xF;
11      }
12      public void testDirect(int max) {
13        for (int i = 0; i < max; ++i) {
14          getVarDirect(max);
15        }
16      }
17      public void testStatic(int max) {
18        for (int i = 0; i < max; ++i) {
19          getVar(max);
20        }
21      }
22    }
23
24    static public void main(String[] args) throws Exception {
25        boolean timing = (args.length >= 1) && args[0].equals("--timing");
26        run(timing);
27    }
28
29    static int testBasis(int iterations) {
30      (new SubClass()).testDirect(iterations);
31      return iterations;
32    }
33
34    static int testStatic(int iterations) {
35      (new SubClass()).testStatic(iterations);
36      return iterations;
37    }
38
39    static public void run(boolean timing) {
40        long time0 = System.nanoTime();
41        int count1 = testBasis(50000000);
42        long time1 = System.nanoTime();
43        int count2 = testStatic(50000000);
44        long time2 = System.nanoTime();
45
46        System.out.println("basis: performed " + count1 + " iterations");
47        System.out.println("test1: performed " + count2 + " iterations");
48
49        double basisMsec = (time1 - time0) / (double) count1 / 1000000;
50        double msec1 = (time2 - time1) / (double) count2 / 1000000;
51
52        if (msec1 < basisMsec * 5) {
53            System.out.println("Timing is acceptable.");
54        } else {
55            System.out.println("Iterations are taking too long!");
56            timing = true;
57        }
58        if (timing) {
59            System.out.printf("basis time: %.3g msec\n", basisMsec);
60            System.out.printf("test1: %.3g msec per iteration\n", msec1);
61        }
62    }
63}
64