反射与注解性能测试

package 反射与注解;

import 反射与注解.POJO.User;

import javax.jws.soap.SOAPBinding;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class 反射性能测试 {
    // 普通正常调用
    public static void test01() {
        long startTime = System.currentTimeMillis();
        User user = new User();
        for (int i = 0; i < 1000000000; i++) {
            user.getName();
        }
        long endTime = System.currentTimeMillis();

        System.out.println("普通调用方法使用时间为->" + (endTime - startTime) + "ms");
    }

    // 反射调用
    public static void test02() throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InstantiationException,
            InvocationTargetException {
        long startTime = System.currentTimeMillis();
        Class<?> c1 = Class.forName("反射与注解.POJO.User");
        User user = (User) c1.newInstance();
        Method getName = c1.getDeclaredMethod("getName", null);


        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user, null);
        }
        long endTime = System.currentTimeMillis();

        System.out.println("普通调用方法使用时间为->" + (endTime - startTime) + "ms");
    }

    // 反射后关闭安全检测调用
    public static void test03() throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InstantiationException,
            InvocationTargetException {
        long startTime = System.currentTimeMillis();
        Class<?> c1 = Class.forName("反射与注解.POJO.User");
        User user = (User) c1.newInstance();
        Method getName = c1.getDeclaredMethod("getName", null);
        getName.setAccessible(true);

        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user, null);
        }
        long endTime = System.currentTimeMillis();

        System.out.println("普通调用方法使用时间为->" + (endTime - startTime) + "ms");
    }

    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
        test01();
        test02();
        test03();
    }
}

执行结果