how to write content in a Specific position in a File

Question

Suppose I have a file named abhishek.txt and that contains the following line

I am , and what is your name.

Now I want to write

Answer 1

You have three choices:

1. Pad the original entry with enough space that RandomAccessFile can be used (and you don't care about some extra trailing space. Easy, but limited utility
2. Use a templating engine (StringTemplate, Velocity, etc) if you are doing this a lot. Possibly too much work if you are doing this just once.
3. Write your own simple templating engine that reads it into memory does a regex replacement and writes it back. Not especially efficient but if you have very simple and limited usage, maybe the best compromise.