Annotation性能对比

package com.fd.test.annotation;

import java.lang.reflect.Method;

public class TestAnnotation {
	public void test_performance() {
		
	}
	
	public static void test1() {
		long start = System.currentTimeMillis();
		TestAnnotation test = new TestAnnotation();
		
		for(int i = 0; i < 1000000000L; i++) {
			test.test_performance();
		}
		long end = System.currentTimeMillis();
		System.out.println("直接调用10亿次耗时: " + (end - start) + "ms");
	}
	
	public static void test2() throws Exception {
		long start = System.currentTimeMillis();
		TestAnnotation test = new TestAnnotation();
		
		Class clazz = test.getClass();
		Method m = clazz.getDeclaredMethod("test_performance", null);
		for(int i = 0; i < 1000000000L; i++) {
			m.invoke(test, null);
		}
		long end = System.currentTimeMillis();
		System.out.println("反射调用10亿次耗时: " + (end - start) + "ms");
	}
	
	public static void test3() throws Exception {
		long start = System.currentTimeMillis();
		TestAnnotation test = new TestAnnotation();
		
		Class clazz = test.getClass();
		Method m = clazz.getDeclaredMethod("test_performance", null);
		m.setAccessible(true);
		for(int i = 0; i < 1000000000L; i++) {
			m.invoke(test, null);
		}
		long end = System.currentTimeMillis();
		System.out.println("不检查安全性反射调用10亿次耗时: " + (end - start) + "ms");
	}
	
	public static void main(String[] args) throws Exception {
		test1();
		test2();
		test3();
	}
}