Satin Creditcare Network Java Developer interview questions

There were 2 rounds. I cleared 1st round and 2nd round was scheduled and also it went well. I was sure that I will get this job and next day I dropped a mail for feedback and got the reply that "We received the negative feedback". I mean he asked me fresher type of questions like what is the difference between JVM,JRE and JDK, reverse a string using without using predefine method. I run this program. I would suggest do not waste your time for giving the interview in this company.