Java Interview Questions and Answer

1. What is Collection API ?
2. Is Iterator a Class or Interface? What is its use?
3. What is similarities/difference between an Abstract class and Interface?
4. Java Interview Questions - How to define an Abstract class?
5. How to define an Interface in Java ?
6. If a class is located in a package, what do you need to change in the OS environment to be able to use it?
7. How many methods in the Serializable interface?
8. How many methods in the Externalizable interface?
9. What is the difference between Serializalble and Externalizable interface?
10. What is a transient variable in Java?

Download Answer and more questions...