URL:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=13270>
Summary: Random number generation creates invalid values.
Project: classpath
Submitted by: None
Submitted on: Thu 06/02/2005 at 13:08
Category: classpath
Severity: 3 - Normal
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Platform Version: None
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Details:
While trying to run Azureus on latest SableVM snapshot( 2005-05-14, using
classpath 0.15 ) I came across a StringOutOfBoundsException and managed to
track the error to the Random number generation, it creates numbers
higher/lower than what it's supposed to( 2147483647 and -2147483647 )
Here's a piece of code that causes this problem, the code inside the main has
been taken from Azureus source code and modified with the System.out so you
can see the output:
public class Test
{
public static void main( String args[] )
{
String uniqueId ="";
String chars =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
for(int i = 0 ; i < 20 ; i++) {
int pos = (int) ( Math.random() * chars.length());
System.out.println( pos );
uniqueId += chars.charAt(pos);
}
}
}
Running this piece of code with classpath 0.13 generates the correct output,
random numbers less than chars.length()
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