☛ How do you know if a linked list has a cycle in it? As in, one of the nodes in the linked list points to a previous node in the list.
☛ Describe the characteristics of an ACID database system.
☛ Is Java a statically or dynamically typed language?
☛ What do we mean by polymorphism, inheritance and encapsulation?
☛ Do arguments in Java get passed by reference or by value?
☛ What is the difference between an abstract class and an interface and when would you use one over the other?
☛ Why use an object Factory and how would you implement the Singleton pattern?
☛ What is the difference between “==” and equals(…) method? What is the difference between shallow comparison and deep comparison of objects?
☛ How is Java EE related to Java SE?
☛ How are Runtime exceptions different from Checked exceptions?
☛ What is the difference between HashMap, ConcurrentHashMap and a Map returned by Collections.synchronizedMap?
☛ Servlets 3.0 introduced async support. Describe a use case for it.
☛ Why do you think lambda expressions are considered such a big thing in Java 8?