因为Java是解释执行的,所以,几乎所有的教科书都说,Java比C++运行速度慢!可是,实际上,是这样的吗?实践是检验真理的唯一标准。
实验环境:
硬件:Intel i5 3230M双核处理器,2.6GHz 4GB DDR3内存
软件:Linux Ubuntu14.04 / Codeblocks / Eclipse
C++ code:
#include <iostream>
#include<stdlib.h>
#include<time.h>
using namespace std;
/*
* Test C++ running speed
*/
int main()
{
int i,j;
double d =0;
int limit =6;
clock_t start , finish;
// begins
start =clock();
for(i=0;i<limit*10000;i++)
for(j=0;j<10000;j++)
d = d + 0.001;
finish =clock();
// output
double time = ( finish - start ) * 1000.0 / CLOCKS_PER_SEC ;
cout<<"Time used:"<<time<<" ms"<<endl;
return 0;
}
实验结果:1780ms(平均值)
Java code:
/*
* This program aims to test Java running speed !
*/
public class Test {
public static void main(String[] args) {
int i,j;
double d =0;
int limit =6;
long start , finish ;
// begin testing
start =System.currentTimeMillis();
for(i=0;i<limit*10000;i++)
for(j=0;j<10000;j++)
d = d + 0.001;
finish =System.currentTimeMillis();
long time = finish - start;
//output
System.out.println("Time used:"+time+" ms");
System.out.println("D value:"+d );
}
}
结果:
580ms(平均值)
总结:综合考虑,Java比C++更快!
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