Free Download SQL The Complete Reference 3rd Edition

Title : SQL The Complete Reference

Author(s) : James R Groff, Paul N. Weinberg, Andy Oppel

Edition : 3rd Edition

Free Download Oracle Database 11g The Complete Reference

Title : Oracle Database 11g The Complete Reference

Author : Kevin Loney

Series : Oracle Press

Types of Variable in JAVA? Is JAVA a pure object oriented programming language?

A class can contain any of the following variable types.

Local variables : variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.

What is Java? What is Class & Object in Java?

JAVA:

Java is an Object Oriented Language. That has the feature of  Object Oriented language like:

Polymorphism

Inheritance

Encapsulation

Abstraction

Classes

Objects

Vitual Memory? Cache Memory? Compiler & Interpreter? Low level language & High level language with difference between them?

Virtual Memory: Virtual Memory is a kind of memory which is used by the OS apart from RAM. It does not require permanent memory storage it just uses the memory virtually or temporarily. it is a reserved space created by windows to dump data in & out. it perform more or less the same function as our physical memory.

Communication? Types of communication?Topology in computer network? Communication between two devices? Component of data communication? What is Protocol?

Communication: 

Communication is defined as transfer of information, such as thoughts and messages between two entities. The invention of telegraph, radio,telephone, and television made possible instantaneous communication over long distances.

Data communications means the transmission (sending and
receiving) of information between two locations by means of electrical
signals. The two types of electrical signals are analog and digital.

Exception in JAVA

Exception

Exception is the inefficiency of the computer system to execute the given statement. An unexpected result obtained from the program is known as Exception.