BlogJava-zhb8015-最新评论

re: java深浅复制

zhb8015 — Fri, 13 Apr 2012 07:24:00 GMT

补充一下：
七、性能测试：
测试结果：复制100000 克隆复制是串行化复制的74倍
100000 clone time:47
100000 serial clone time:3500
Multiple is(serial/clone):74

测试单元的代码：
******************
@Test
public void deepCloneVsSerial() throws CloneNotSupportedException, IOException, ClassNotFoundException {
int max = 100000;

String manName = "Robert C. Martin";
int manAge = 40;

int teacherAge = 50;
String teacherName = "T1";
Teacher teacher = new Teacher(teacherName, teacherAge);

Man man = new Man(manName, manAge, teacher);

//begin
long start1 = System.currentTimeMillis();
for (int i = 0; i < max; i++) {
man.clone();
}
long end1 = System.currentTimeMillis();
System.err.println(max + " clone time:" + (end1 - start1));

long start2 = System.currentTimeMillis();
for (int i = 0; i < max; i++) {
man.serialClone();
}
long end2 = System.currentTimeMillis();
System.err.println(max + " serial clone time:" + (end2 - start2));

System.err.println("Multiple is(serial/clone):" + (end2 - start2)/(end1 - start1));
/**
* 100000 clone time:47
100000 serial clone time:3438
Multiple is(serial/clone):73
*/
}

******************

zhb8015 2012-04-13 15:24 发表评论

re: 求质数，难以理解的代码，有兴趣可以看一下

zhb8015 — Thu, 12 Apr 2012 09:52:00 GMT

Robert C. Martin's explation:

/**
* Every multiple in the array has a prime factor that
* is less than or equal to the root of the array size,
* so we don't have to cross of multiples of numbers
* larger than that root.
*/

zhb8015 2012-04-12 17:52 发表评论

re: Advice about migrating to new platfrom

qingyue — Thu, 05 Apr 2012 04:34:00 GMT

platfrom or platform??

qingyue 2012-04-05 12:34 发表评论

re: Advice about migrating to new platfrom

tb — Tue, 03 Apr 2012 05:19:00 GMT

good

tb 2012-04-03 13:19 发表评论