One thing that you can do with Java is create a text document that you can open in Windows' Notepad program. Open your Java software development kit and start a new project.

First things first, you will have to write the code that you want to run and save that as a Java executable file. For this purpose, you can use either MS Word or Notepad.

How to Encrypt and Decrypt. This program uses the Caesar Cipher algorithm, which we discussed last month.As a review, this cipher works by shifting each letter by 0 to 25 times.