import java.lang.reflect.Method;


public class ReflectionSpeedTest {
    
    public static void main(String[] args) {
        int times = 100000;
        long simpleCallTime = simpleCall(times);
        long reflectionCallTime = reflectionCall(times);
        
        System.out.println("number of calls: " + times);
        System.out.println("simple call time: " + simpleCallTime);
        System.out.println("reflection call time: " + reflectionCallTime);
    }
    
    
    private static long simpleCall(int times) {
        ReflectionSpeedTest worker = new ReflectionSpeedTest();
        
        long time = System.currentTimeMillis();
        
        for (int i = 0; i < times; i++) {
            worker.doWork();
        }
        
        return System.currentTimeMillis() - time;
    }
    

    private static long reflectionCall(int times) {
        try {
            Class workerClass = Class.forName("ReflectionSpeedTest");
            Object workerInstance = workerClass.newInstance();
            Method method = workerClass.getMethod("doWork", null);

            long time = System.currentTimeMillis();

            for (int i = 0; i < times; i++) {
                method.invoke(workerInstance, null);
            }

            return System.currentTimeMillis() - time;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    
    
    public void doWork() {
        int i = 5 * 6;
    }
}