Cognizant Interview Experience for Java Spring Boot Full Stack Developer

I appeared in a Cognizant Interview for Java Spring Boot Full Stack Developer.
There were 2 rounds (1 Technical & 1 HR). Below are the technical round questions.

Java:

• Features of JAVA 8.
• What is a null pointer?
• Which is the superclass of all classes in JAVA?
• Which is the Exception of all Exceptions in JAVA?
• Explain Getter, Setters & toString.
• Explain Polymorphism in JAVA
• Difference between the following:

1. Array and List
2. List and Set
3. Set and Map
4. Interface and Class
5. Java and Javascript
6. Checked and Unchecked Exception

• What are micro-services?
• Types of micro-services.
• What are comparators in JAVA?
• What is collection and its hierarchy?
• What is the method of Overloading?
• What is the method of Overriding?
• Explain equal() and hashCode()

Database:

• What is schema?
• Difference between Drop, Delete and Truncate table.

JavaScript:

• What is the Arrow function?
  I had cleared the technical round and got a call from HR after 10 days(approx) for the HR round. After the HR round, I didn’t get any response even after 2-3 follow-ups. In HR round Questions were:

HR Round:

• About yourself.
• Your current role and responsibility.
• How is this position relevant to your current work and your skill set.
• Why do you want to leave your current company?
• Why do you want to join Cognizant?
• What is the notice period & is it negotiable?
• Current & Expected CTC.