☛ 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?