This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Seems to me that is essentially the problem solved by a compiler so you should look for tutorials on compiler writing. To give you a start, you will need some way to recognize/distinguish between operators and operands. Bill