Setting bits question

I have a bunch of bytes of data I want to build in a byte array.
I looked at BitSet but I dont' think does what I want.
I'd like to be able to specify a start byte/bit, end byte/bit, along with the data I want to add.
Ex.
I'd like to be able to set the first 4 bits of the first byte or
specify stariting at byte 2, for the next 24 bits write this integer.
I know I could do a bunch of fanagling with and/ors,etc. but I was wondering if there is another way.
Thanks

A few weeks ago, I was playing around with something similar after reading this ACM article (http://queue.acm.org/detail.cfm?id=1563874).
To illustrate his point, the author created a bit-based record format used to hold U.S. Census data. Each record held information on one person. So, the first bit was the sex, the next 7 bits was the person's age, the next 32 bits was the person's income, etc. For fun, I created a Java program which could read and write these records. It was tricky doing this, but I got it to work.
One thing to remember that bothered me was that Java doesn't support the concept of "unsigned" like C does. So, when you read all your bytes into a byte array, you must deal with the fact that if the "left-most" bit of the byte is 1, the byte integer value will be negative. And you'll have to know a lot about bit shifting and AND. I looked into BitSet as well, but it didn't help me either.

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