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Fields = data members :P

Global is a concept when programming in C/C++ (and quite a few other languages) that meant everything had access to that variable. The reason it doesn't show up in Java is...

:P there are no such things as "global" variables in Java, only object/class fields.

hmm. i'm going to assume that the method bit() gets a input of 0/1, then converts it to a number, right?

If so, you can use the .nextInt() method of the Scanner class, and then just see if value...

If you want to extract each character, use the .charAt() method

// get the first character
header.charAt(0);

hmm, the one thing I can see is wrong is using DataInputStream to get user input from System.in. This is causing Java to hang because technically, there's no end to the System.in stream. Instead, use...