The program as written is strange. Takes 2304 tries to get to 0.2 delta.
The printed numbers are very uniform ;o(
This works for me:
import java.util.Random;
public class P1 {
public static void main(String[] args) {
Random rnd = new Random();//0);
double last = rnd.nextDouble();
System.out.println("Last ="+last);
long i = 1;
for(; i < Long.MAX_VALUE; i++) {
//rnd.setSeed(i); //
double next = rnd.nextDouble();
System.out.println(next);
if (Math.abs(next - last) > 0.2)
break;
}
System.out.println(i);
}
}
I think Random() actually initializes the seed to
a value based on the current time, which is better than intializing with
a number
BTW, setseed() uses only 48 bits of the given number
Cheers
<k/>
On 2/19/11 Sat Feb 19, 11, "Lance Norskog" <[email protected]> wrote:
>What does this program print?
>
>
>package hack;
>
>import java.util.Random;
>
>public class JDKRandomThreatOrMenace {
>
> public static void main(String[] args) {
> Random rnd = new Random(0);
>
> double last = rnd.nextDouble();
> long i = 1;
> for(; i < Long.MAX_VALUE; i++) {
> rnd.setSeed(i);
> double next = rnd.nextDouble();
> if (Math.abs(next - last) > 0.2)
> break;
> }
> System.out.println(i);
> }
>
>}
>
>Your prize if you get it right? A patch would be welcome...
>
