Can FileReader write to a binary file

I am just wondering because i would like to use it for a program that is suppose to write in binary. If it can, should I just insert an array of characters that are 1 or 0 or should i actually figure out the bites involved.

Readers read, not write.
So you have a char[] that looks like this: {'0','1','0','0',...}? That's an odd thing to have. I would roll up my sleeves and convert it to a byte[]. Writing that to a file is a simple matter: use FileOutputStream.
edit: can you avoid having a char[] in the first place?

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