Java Developer

The BigInteger class implements arbitrary precision integer arithmetic, and BigDecimal does the same for floating-point numbers. BigInteger provides analogues to all of Java's primitive integer operators, and all relevant methods from java.lang.Math. Additionally, BigInteger provides operations for modular arithmetic, GCD calculation, primality testing, prime generation, bit manipulation, and a few other miscellaneous operations.

The Java Preferences API accommodates the need to store both system and per-user configuration data persistently across executions of the Java VM. The Preferences API is like a portable version of the Windows registry, a mini database in which you can keep small amounts of information, accessible to all applications.

The quick and simple way to get today's date and time is to construct a Date object with no arguments in the constructor call, and call its toString( ) method, for example:
System.out.println(new java.util.Date( ));

Classes are the building blocks of a Java application. A class can contain methods (functions), variables, initialization code and other classes(inner classes). It serves as a blueprint for making class instances, which are runtime objects that implement the class structure.

You declare a class with the class keyword. Methods and variables of the class appear inside the braces of the class declaration:

The aim of this tutorial is to tell you how to use SAX to create a document handler and pass it to the SAX parser

To process an XML document, you need to parse it. A parser is a program that reads a file, confirms that the file has the correct format, breaks it up into the constituent elements, and lets a programmer access those elements. The Java library supplies SAX XML parser.

SAX is a low-level, event-style API for parsing XML documents. SAX originated in Java but has been implemented in many languages.

A thread is a flow of control within a program. A thread is similar to the more familiar notion of a process, except that threads within the same application are much more closely related and share much of the same state.

Creating and starting threads

There are several ways to implement threading, and they all require you to implement the Runnable interface.

The Java programming language, developed at Sun Microsystems under the guidance of Net luminaries James Gosling and Bill Joy, is designed to be a machine-independent programming language that is both safe enough to traverse networks and powerful enough to replace native executable code 

Java is a high-level programming language that has many functions. It is used to develop applets that reside on Web pages, applications that run on your desktop, server-side middleware that are used to communicate between clients and server resources.