1. What is the difference between JPA, Hibernate and Spring JDBC 2. What is AWS Lambda and why we need it 3. How much time does AWS Lambda take for running a program (15 min) and what memory size it allows (5MB) 4. Write a Singleton and explain how you can create instance of Singleton from Cloneable 5. How to write Singleton to handle multiple threads 6. What are the features of Java 8 7. What is Global Load balancing 8. Write a Program to remove duplicates from an ArrayList without using a Set 9. What is String pool and why is String Immutable 10. Write answer for this code String s1 = "abc"; String s2 = "abc"; Sysout(s1 == s2); // true, since they both are in String pool Sysout(s1.equals(s2)); // true String s3 = new String("abd"); Sysout(s1==s3) // false Sysout(s1.equals(s3); // true 11. What are the datatypes in Java
