Cleared the first round of the Skype interview, where the interviewer asked about my project and a few core Java questions.

In the second round, they asked about Singleton design pattern implementation and asked me to write a simple program, which I could not do. Later, they finished the interview, stating I was not fit for the role.

Below are core Java QNS he asked in Round 1.

1. Can we write private classes in Java? Yes, inner classes can be private.
2. How to make a class immutable?
3. Can we run multiple JVMs in one JRE?
4. What is JVM and JRE?
5. How do you put a message in a Queue (related to JMS)? Requirement was for an ESB Java developer.

In the second round, he asked about Singleton design pattern implementation and asked me to write a simple program, which I could not do. Later, he finished the interview as I was not fit for the role.