BitLocker status "Not Encryptable" for my USB drives

Question

I am just testing out some threads, trying to figure out how to use them. My question is, how can I get my current scenario to work how I want it?

I want to have this program print out 1 - 100. I have two methods; oddNumbers and evenNumbers

oddNumbers:

public static void oddNumbers() {
  new Thread(new Runnable() {
    public void run() {
      for (int i = 0; i < 100; i++) {
        if (i % 2 == 1) {
          System.out.println(i);
        }
      }
    }
  }).start();
}

evenNumbers:

public static void evenNumbers() {
  new Thread(new Runnable() {
    public void run() {
      for (int q = 0; q < 100; q++) {
        if (q % 2 == 0) {
          System.out.println(q);
        }
      }
    }
  }).start();
}

main method

public static void main(String[] args) {
  evenNumbers();
  oddNumbers();
}

So, from what I understand, the methods oddNumbers and evenNumbers are running on different threads. So if they are, then why isn't my output 1-100?

Here's the output I get:

0
2
4
6
.
.
.
50
1
3
5
.
.
.
99
52
54
56
.
.
.
100

About half way through the evenNumbers loop, the oddNumbers loop cuts it off. Why does this happen, and how do I set it up so that it'll print 1-100?

Thanks in advance!

Solution

It appears to be the usual suspect: group policies. The following GPO prevents me from enabling BitLocker on removable drives:

Windows Components/BitLocker Drive Encryption/Removable Data Drives/Control use of BitLocker on removable drives was set to Disabled

So no luck for me :) - I'll try an alternative like TrueCrypt, but that isn't as transparent of course.

Comments

[iglvzx]

Windows 7? or Vista?

[Thomas Vochten]

My laptop runs Windows 7 x64 Enterprise

[Ramhound]

@iglvzx - What does it matter? Bitlocker works nearly identical in both cases. Besides base on the screenshot thats Windows 7.

[Andy Turner]

Well, you start the even numbers thread before the odd numbers thread... But even if they started at the same time, why do you think they would alternate?

[Kaelinator]

I wasn't really expecting a perfect alternation, but I thought the numbers would be a bit mixed. I don't get why one for loop cuts another off, and why they can't go at the same time. @AndyTurner

[Daniel Widdis]

It's more likely your output buffers filling and being flushed to output than the actual execution time of the programs. Tack on a timestamp and you might see a bit more overlap.

[zapl]

Reminds me of: 'A programmer had a problem. He thought to himself, "I know, I'll solve it with threads!". has Now problems. two he'

[Sleiman Jneidi]

@Kaelinator what to do you mean by "same time"? threads might be running at the same time on multi-core, but System.out.print has a synchronized block that serialises writes

[Andy Turner]

@Kaelinator well, like I say, you start one thread first - so it gets a way through its numbers before the other one starts; then the other one starts and "cuts off" the first thread.

[MadProgrammer]

Thread scheduling is something you should know about, but try not to spend to much time thinking about. Try adding a Thread.yield after each System.out statement or Thread.sleep(1)

[Thomas Vochten]

The 3 reasons a disk cannot be encrypted (disk full, incompatible file system, or a drive is designated as the system partition) don't apply to my situation I'm afraid...