本文主要是介绍性能对比分析,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
package cn.rushangw.reflection;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
//分析性能问题
public class Test10 {
//普通方式调用
public static void test01(){
User user = new User();
long startTime = System.currentTimeMillis();
for (int i = 0; i < 1000000000; i++) {
user.getName();
}
long endTime = System.currentTimeMillis();
System.out.println("普通方式执行10亿次"+(endTime-startTime)+"ms");
}
//反射方式调用
public static void test02() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
User user = new User();
Class c1 = user.getClass();
Method getName = c1.getDeclaredMethod("getName", null);
long startTime = System.currentTimeMillis();
for (int i = 0; i < 1000000000; i++) {
getName.invoke(user,null);
}
long endTime = System.currentTimeMillis();
System.out.println("反射方式执行10亿次"+(endTime-startTime)+"ms");
}
//反射方式调用 关闭检测
public static void test03() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
User user = new User();
Class c1 = user.getClass();
Method getName = c1.getDeclaredMethod("getName", null);
getName.setAccessible(true);
long startTime = System.currentTimeMillis();
for (int i = 0; i < 1000000000; i++) {
getName.invoke(user,null);
}
long endTime = System.currentTimeMillis();
System.out.println("反射方式关闭检测执行10亿次"+(endTime-startTime)+"ms");
}
public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
test01();
test02();
test03();
}
}
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