Montags and Clarisse's realtionship is weird. If she had not died I think they would have become a lot closer throughout the book. Clarisse seemed to bring out a different side of Montag. They way she would ask him questions and make things for him.
JKS stands for Java KeyStore. It is a repository of certificates (signed public keys) and [private] keys. You can export a certificate stored in a JKS file into a certificate file. You can use the keytool utility found in Java distributions to maintain your JKS trust and key repositories.
A JAR file is a Java ARchive. It's based on the pkzip file format, and it lets you bundle all your classes so that instead of representing your feature with x class files, you wrap it into just a single JAR file. 1) Making a jar file. - put all your class files into /classes.