public class Main {
static class SuperClass {
protected static int getVar(int w) {
return w & 0xF;
}
}
static class SubClass extends SuperClass {
final int getVarDirect(int w) {
return w & 0xF;
}
public void testDirect(int max) {
for (int i = 0; i < max; ++i) {
getVarDirect(max);
}
}
public void testStatic(int max) {
for (int i = 0; i < max; ++i) {
getVar(max);
}
}
}
static public void main(String[] args) throws Exception {
boolean timing = (args.length >= 1) && args[0].equals("--timing");
run(timing);
}
static int testBasis(int iterations) {
(new SubClass()).testDirect(iterations);
return iterations;
}
static int testStatic(int iterations) {
(new SubClass()).testStatic(iterations);
return iterations;
}
static public void run(boolean timing) {
long time0 = System.nanoTime();
int count1 = testBasis(50000000);
long time1 = System.nanoTime();
int count2 = testStatic(50000000);
long time2 = System.nanoTime();
System.out.println("basis: performed " + count1 + " iterations");
System.out.println("test1: performed " + count2 + " iterations");
double basisMsec = (time1 - time0) / (double) count1 / 1000000;
double msec1 = (time2 - time1) / (double) count2 / 1000000;
if (msec1 < basisMsec * 5) {
System.out.println("Timing is acceptable.");
} else {
System.out.println("Iterations are taking too long!");
timing = true;
}
if (timing) {
System.out.printf("basis time: %.3g msec\n", basisMsec);
System.out.printf("test1: %.3g msec per iteration\n", msec1);
}
}
}