This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
You can only print characters that exist in the font that is being used. If your Windows command prompt uses a font that doesn't contain the characters you want to display, then you get question marks or empty squares instead of the characters. Besides that, I'm not sure if the Windows command prompt has other limitations so that those characters can't be displayed, even if you use a font that has them.