Read and write binary from txt file

Well
i need to know how to convert strings to binary data
("Chapter One"--->100111000011) to compress them using Lempel Ziv compression algorithm, and print a new file with binary codes.
I know that i have to use OutputStream and ImputStream classes, but i don know how it works...
Please help me with this problem...

String.getBytes(String charsetName)

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