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Java was developed by James Gosling for Sun in 1995. It was designed as a high level language for embedded devices, but it took off as a “safe” language for downloading applications from the internet and J2ME became standard on many mobile phones. Java was acquired by Oracle when they purchased Sun, and is available as open source. There are unofficial implementations such as Android’s inplementation and Microsoft also had their own implementation which had extensions to enable Windows support. It is similar to C++ although it is missing many of the advanced features that C++ offers, although later versions of Java did add some support for templates. Compared to C++ it offers a managed memory system, which simplifies programming but it lacks support for overloaded operators, pointers, and unions to name a few obvious differences.

Java Standard Edition : All the features of Java including Java 7. It is a language that runs on a VM (virtual machine), which means that is is portable between different platforms so you can write a single program that runs on Windows, Mac or Linux computers. It supports Swing & AWT, to enable GUI development, JDBC (Java Database Connectivity) for access to databases, RMI (remote method invocation) for calling methods outside the program, XML handling as well as a complete set of general programming libraries.

Java Micro Edition : This is a cut down version of Java that runs on mobile phones and embedded devices. It is based on Java 2 and may even lack support for floating point under certain configuarations. It normally does not allow you to access files apart from one contained inside the jar file. There are extensions supported on some platforms to enable SMS support, or other features that are not part of the base standard.

Java Enterprise Edition : Based on Java Standard Edition, with extended libraries, it is designed to include support for JSP (Java Server Pages), JMS (Java Messaging Service), EJB (Enterprise Java Beans), and allows for large scale reliable applications, and can support secure network connections. It is designed to allow for robust internet applications.

Help on Java Programming Basics

Java Programming Syntax, How to use an IDE (Eclipse and Idea), methods.

Introduction to Variables : string, int, boolean, byte, char, short, float, double, long, arrays.
Comparison operators: <,>,==,!=,<=,>=
Comments: // and /* */, /** */
Operators: +,-,*,/,++,–,%,&,&&,|,||,<<,>>,>>>,!,?,:
Strings: StringBuilder, StringBuffer, length, charAt, length, split, substring, replace, toLowerCase, toUpperCase, trim, endsWith, startsWith, indexOf, equals, equalsIgnoreCase
Regular Expressions: Pattern, Matcher, matches,
Assistance with Intermediate Java Programming.
Advanced Java Language Programming support.
GUI: Swing, AWT, SWT, JavaFX
Java supports some UI frameworks such as Swing, SWT and JavaFX that allow you to write a Windows style application that is cross platform.Threads: sleep, yield, run, Runnable, join, start, atomic
It is hard to write an efficient multithreaded application that is thread safe (interaction between threads means the results are not repeatable, so it may work one time but not the next, depending on the order the threads execute in). When writing a multithreaded application, you need to deal with atomic variables, syncronized code.Networking: TCP, UDP, ports, URL, URLConnection, Socket, ServerSocket, DatagramPacket, JSP
Java supports both TCP and UDP sockets, which means it can be used to support realtime internet applications as well as a web server, although if you are writing a web server you may want to consider using JSP (Java Server Pages) with Apache Tomcat, Jetty or the Google App Engine. You set up a connection with a URL object, which you can query to getProtocol, getHost, getPort along with the other parts of the url, and can openConnection to it before you connect. Once you have a connection you can treat it as though it were a local file and read or write from it (depending on the type of connection you have). You can use sockets if you want to write a client/server application, such as a game or a chat program.

Serialization: Serializable interface, ObjectOutputStream, ObjectInputStream, writeObject, readObject
You can implement a serializable object by just implementing the Serializable interface, you don’t even need to add any methods (you can mark fields you don’t want to be serialized by setting them as transient.). This works for most cases, but you might want more control, in which case you can use readObject and writeObject (or writeReplace for some more advanced cases). Depending on the application you might want to include versioning, which you should implement by adding an id field then if you need to change the format later, you can check the id field to determine the type of object you are deserializing.