Octaware Technologies interview question

1. Basic and Average Technical questions was asked. Because I done a Course in Java. So, question from Java were asked. 2. Conceptual and deep Technical questions was asked. SQL Table Relation Ship, Primary key and Foreign Key. Java, Window based and Servlets Questions were asked. Write program on Prime number. What is String, String Buffer, Array, Constructor, Constructor Overloading, Method Overloading and Method Overriding, Inheritance, Abstract class and Interface and difference between them, Collections, File Handling ,Multi Threading, etc.