package com.liuxt.bean;
import junit.framework.TestCase;import org.springframework.context.support.AbstractApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.util.StopWatch;
public class ComputerTest extends TestCase { public static void main(String[] args) { AbstractApplicationContext ctx = new ClassPathXmlApplicationContext( new String[] { "bean/ComputerBean.xml" }); ComputerBean computer1=(ComputerBean)ctx.getBean("computer"); ComputerBean computer2=(ComputerBean)ctx.getBean("computer"); System.out.println("computer1===computer2:"+(computer1==computer2)); testGetBeanFromSpring(ctx); testNewInstaniate();
ctx.destroy(); }
private static StopWatch testGetBeanFromSpring(AbstractApplicationContext ctx) { StopWatch stopWatch=new StopWatch(); stopWatch.start(); ComputerBean computer=(ComputerBean)ctx.getBean("computer"); for(int i=0;i<100000;i++){ computer=(ComputerBean)ctx.getBean("computer"); computer.sum(i,i); } stopWatch.stop(); System.out.println("100000 gets took "+stopWatch.getTotalTimeMillis()+" ms"); return stopWatch; }
private static void testNewInstaniate() { ComputerBean computer3; StopWatch stopWatch=new StopWatch(); stopWatch.start(); for(int i=0;i<100000;i++){ computer3=new ComputerBean(); computer3.sum(i,i); } stopWatch.stop(); System.out.println("100000 gets took "+stopWatch.getTotalTimeMillis()+" ms"); }
}
测试的前提条件：
JDK：java version "1.6.0_13"
winxp cpu:2.6Ghz
测试结果：
computer1===computer2:false100000 gets took 907 ms100000 gets took 0 ms
不知道为什么差距这么大。
请大家帮忙解释一下啊。。。期待中。
