java反射耗时测试案例解析

package com.test.reflection;
import java.lang.reflect.Method;
public class ReflectionDemo {
  public static void main(String[] args) throws Exception {
    // 常规方式
    Student student = new Student();
    long startNormal = System.currentTimeMillis();
    for (int i = 0; i < 1000000; i++) {
      student.setName("hello");
    }
    System.out.println("timeNormal=" + (System.currentTimeMillis() - startNormal));
    //反射方式
    Class<?> cla=Class.forName("com.test.reflection.Student");
    long startReflection = System.currentTimeMillis();
    for (int i = 0; i < 1000000; i++) {
      Method method=cla.getDeclaredMethod("setName", String.class);
      method.invoke(cla.newInstance(), "hello");
    }
    System.out.println("timeReflection=" + (System.currentTimeMillis() - startReflection));
  }
}

timeNormal=8
timeReflection=537