Parantumaton posted:

If your desired range is 1...7 billion and you can get to 2 billion, why not just do that one to three times, add those three together and then add another billion?

FateFree posted:

How do i generate a random long from 1-7 billion, when there is no range function like there is with integer?

Psychorider posted:

The same way you do it if you don't have a range function for integer seems to work.

code:

long random = 1000000000L + (Math.abs(new Random(seed).nextLong()) % 6000000000L);

Or to modify Parantumaton's idea slightly

code:

Random r = new Random(seed);
long random = 1000000000L + (r.nextInt(3) * 2000000000L) + r.nextInt(2000000000);

Although the first way is better obviously.

FateFree posted:

Hmm i see where the confusion is, i didn't mean from 1 billion to 7 billion, just the old school 1 to 7 billion. So should this be the correct approach?

code:

Math.abs(new Random(seed).nextLong() % 7000000000L) + 1

FateFree posted:

I guess what makes me worry is that the absolute value function basically gives two random values that are the same, 10, -10 for example.

LakeMalcom posted:

For the random number/long guy: how about this: http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigInteger.html#BigInteger(int,%20java.util.Random)

dorkface posted:

I'm betting this is impossible due to security restrictions, but I would like to produce an applet/scriplet that would be able to gather WMI information from a host machine and display it on a web page. Is this possible, or am I entirely stupid for even thinking about it?

yatagan posted:

Post your code, and the code of the generator.

I am in posted:

Do this, but use it to implement nextInt(int n) from earlier using BigIntegers. Using modulo to limit the random number range is a really bad idea. In short, if you have range and distribution

Mulloy posted:

Parantumaton posted:

If your desired range is 1...7 billion and you can get to 2 billion, why not just do that one to three times, add those three together and then add another billion?

Mulloy posted:

I'm either really dumb or incredibly dumb.

I have a main class which handled the creation and maintenance of a custom object which is essentially an array with a bunch of instance variables like rows, cols, contents at various locations, etc... It got ridiculously huge with file i/o so I moved the i/o to its own class and extended the original since its intended to manage everything in the primary.

The issue I'm running into seems like a really fundamental misunderstanding of Java.

The first class properly gives the second the file to process. The array object is declared in the first class. The second does not declare it, and it renders the information in the array. When the first class attempts to manipulate the array object, it dies for null pointer exceptions.

It seems that even though I thought I had both classes pointing to the same instance of the object, they're not. I've googled a bit trying to see what I'm missing, but I was wondering if anyone had any suggestions to point me in the right direction, or if I'm just thinking about this all retardedly and am trying to do something that can't/shouldn't be done.

LakeMalcom posted:

For the random number/long guy: how about this: http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigInteger.html#BigInteger(int,%20java.util.Random)

FateFree posted:

In math terms, how do I find the smallest power of 2 thats greater than a given number, in fast java code?

ynef posted:

In math, you'd probably get away with ceil(log₂(given_number)), but Java doesn't have a general logarithm function like that (just the natural logarithm). You'd have to use the Change of Base theorem to compensate.

I am in posted:

Also http://java.sun.com/j2se/1.4.2/docs/api/java/math/BigInteger.html#bitLength%28%29

Mulloy posted:

code:

     A bunch of stuff to create windows and buttons and listeners.
     public class WindowOpener implements Runnable
     {
           public void run()
           {
                engine.processGrid();
           }
      }

}

When I try to run processGrid() from within TwoWindows it throws a null exception. Not sure what I'm misunderstanding. It's specifically the array class Grid I'm trying to have everything reference the same instance of that seems to be failing.

Mulloy posted:

code:

public class Engine extends JFrame
{
public static Grid aGrid;

public static void main( String[] args )
{
       JFrame window = new TwoWindows();
       window.setLocation(280,350);
       window.show();
}

public void processGrid()
{
      switch(aGrid.arrayContents())
      {
         react to current value of the array.
      }

}


}

----

public class TwoWindows extends Engine
{

     A bunch of stuff to create windows and buttons and listeners.
     public class WindowOpener implements Runnable
     {
           public void run()
           {
                engine.processGrid();
           }
      }

}

When I try to run processGrid() from within TwoWindows it throws a null exception. Not sure what I'm misunderstanding. It's specifically the array class Grid I'm trying to have everything reference the same instance of that seems to be failing.

RichardA posted:

A subclass can not access anything in a super class simply because it is a subclass. It gets its own entirely separate copy of the fields.

8ender posted:

We've just started using IBatis after a long and troubled struggle with Eclipselink and I think I'm in love. I can write regular SQL and have it map to objects like an ORM, it takes almost any object for parameters, outputs the results to almost anything, lazy loading, caching, dynamic SQL, the list goes on. Its everything I like about ORMs with all the lovely parts removed, and without having to rely on the framework to write dubious SQL.

Has anyone else here used it on any big projects? I'm worried I'm in some sort of honeymoon phase here and I'm going to start to hate it.

geeves posted:

I'm having a problem setting a cookie via the HttpServletResponse object with all flavors of IE. When in debug mode, everything is set as it should be and I can follow the Response through the Servlet and the JSP code. But it fails to be set.

Is there something I'm missing with IE? I have never run into this problem with JavaScript or PHP or even Java before. Firefox, Opera, Safari, Chrome all work as expected. It's just IE.

In a method for UserLogin I have the following:

php:

<?

Cookie fooCookie = Bar.addCookeu(handler, request);
if(null != fooCookie) {
  reponse.addCookie(fooCookie);
}

.....

// in Class Bar:
public static Cookie addCookie(ContactHandler handler, HttpServletRequest request) {
        Cookie fooCookie = null;
        String uuid = "";
        String pass = "";
        int age = -1000;
        String cookieString = null;
        
        if(null != handler) {
            uuid = handler.getUuid();
            pass = handler.getPassword();
            age = (handler.isRememberMe()) ? Constants.COOKIE_LENGTH_REMEMBER : Constants.COOKIE_LENGTH_DEFAULT;
            cookieString = uuid + ";" + pass;
            log.info("Cookie String: " + cookieString);
        }
        try {
            fooCookie = new Cookie(Constants.COOKIE, cookieString);
            String serverName = ".foo.org";
            
            fooCookie.setDomain(serverName);
            
            fooCookie.setPath("/");
            fooCookie.setMaxAge(age);
           
        } catch (Exception e) {
            log.error("CAN'T ADD COOKIE: " + e.getMessage());
        }
        return fooCookie;

    }
?>

RichardA posted:

Mulloy said "The array object is declared in the first class. The second does not declare it, and it renders the information in the array.". This, along with the lack of a Engine instance or a aGrid reference being passed to TwoWindows in the posted code, left me with the impression that Mulloy may not have a good understanding of classes and thinking that a instance of TwoWindows has access to WindowOpener fields; i.e. that aGrid in TwoWindows will be a reference to the same aGrid in WindowOpener.(I know considering how classes can have more than one instance will reveal how nonsensical that is but I have seen someone make this mistake before)

quote:

By its own copy I meant that state that while a subclasses inherited fields have the same name and type as the fields of the superclass, they are separate variables. Copy was a poor chose of word to use.

dreamality posted:

I believe it's got something to do with

code:

String serverName = ".foo.org";
fooCookie.setDomain(serverName);

remove the domain or place a correct domain, if running on localhost, might want to try localhost.

If that still doesn't work try removing all other "sets" and do a simple cookie:

code:

fooCookie = new Cookie("name","value");

see if that works, at least that will point you to the right direction.

Good Luck

epswing posted:

Does he have a really good reason why he isn't using Swing?