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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.

Covers the basic types and the differences between them. How to declare a variable, including the legal names, initializing arrays and accessing them.
Loops and conditions : for loops, while loops, foreach, if then else, switch, case, break, continue, default
For loops consists of initializer, condition test, modifier and body each of these can be empty. A while loop, can have a condition either at the start or the end of a loop. Switch statements allow a range of values to be checked each with their own code to be executed if the value matches. If then else statements allow for more complex expressions than a switch statement. There is also a ternary operator, which uses
                        ? and : and acts as a simple form of if then else.
Java has // for single line comments, /* */ to mark a section of code as a comment, and /** */ for Javadoc comments which are used by tools to provide documentation.
 Java supports operations on numeric values, strings, and booleans. In addition to the regular operators, there are the assignment operators which are a useful shortcut. The other special type of operators include the shortcut evaluations which allow you to check one part of a condition before carrying on with the rest. There are also the increment and decrement operators which add or subtract 1 to a variable.
Java strings are immutable (they can not be changed), but you can create a new string with the operators and methods above. Strings allow for Unicode, so they can be used to support languages such as Chinese and Japanese as well as English.
Java supports regular expressions, with + meaning one or more of the previousexpressions, and * meaning 0 or more of the previous expression. It also supports sets with [], and groups with (), you can also use | to indicate or. There are also special codes for digits, alphabetical characters, etc.
Packages : package, import, static import
A java package allows you to collect a group of files, so that they can be used with another set of files without you needing to worry about naming conflicts. A static import allows you to include constants without you needing to qualify them, however it can lead to problems if the file changes.

Using Classes : class, object, null, interface, fields, enum, abstract, extends, implements, private, protected, public, this, super, new, toString, equals, polymorphic Java is a class based language, it is similar to C++ but it is missing multiple base classes, instead you use interfaces and implement them to get the same effect. You can use extends to derive a sub class from the super class, and then change the behavior on the sub class. For example, if you have an Animal base class, with a noise method, a dog object, would bark, and a cat object would meow. Private is used when a method or field can not be manipulated directly, say you have a bank account class, the balance would be a private field, since
you don't want people to be able to change the value unless they are making a deposit or a withdrawal, which would be public methods. The object class is the class that all other classes inherit from, and means that there are certain methods that any object will support. The methods include toString which is used to provide a string representation of the object (it's normally human readable, although it doesn't have to be). Another method is equals, which is used so that you can compare two objects to see if they are the same, hashCode is used to provide a representation that can be used if you want to put the object into a set or some other collections. An abstract class is a class that represents something that can't be created, for example you might have an abstract shape class, with sub classes such as circle and triangle. The shape class may have a method draw, which is abstract that means sub classes are expected to implement it. To access fields inside a method, you can use "this" to access the current object (a lot of the time, it is implicit and you can ignore it). You creat an instance of a class with the new operator, and that calls the constructor for the object and allocates the memory.

Functions : virtual, static, arguements
Java supports methods with multiple arguements, you can have a method with the same name but with different arguements and it will still work correctly (thi is different than C, but works the same as C++). A static method, does not need to refer to an existing object, and a virtual method is one where you call the method based on the class of the object, so you can use the noise method from the class animal, and it will call the method defined in the dog or cat class, depending on the type of the object.

Exception handling : exception, try, catch, finally
Exceptions are a way of signalling errors, in C it was traditional to use error codes as return codes from functions, but the value was often ignored. Exceptions provide a way of forcing the error to be handled (or at least allows the system to display an error message if it is not caught). The finally statement is used so that you can make, some code is called, even if an exception is thrown. This can be used to close a file that has been opened, or a network connection to be closed.

Collections : Set, List, Map, HashMap, HashSet, LinkedList, TreeSet, add, addAll, contains
Java has a set of collection classes, which are similar to the STL in C++. There are abstract collections, such as Set, and List which provide an interface and implementations such as TreeSet and ArrayList. There are methods such as contains which are provided by all the collections, although the speed of checking contains depends on the type of collection, a TreeSet is much faster than an ArrayList. Sets are unordered whilst Lists are ordered, which means if you insert the values 1,2,3 into a Set and into a List, then you can get them back in the same order from a List, but from a Set the order is not preserved, so you can tell you have those values, but you can't say anything about the order they were added to the Set. All the collections have a size() method to count how many elements there are present in the collection, along with clear() and isEmpty(). Sets and Lists have an add() function to add an element to the collection, whilst Maps have a put() method instead which takes a key along with the value. A Map allows you to associate an element with a value, so you could have a list of employees stored in a Map, using their name as a key, and you could look at the employee object for a given name efficiently. If you want to store items in a collection you should implement hashCode and equals for the class of objects you wish to store.

Handling Files : BufferedReader, FileReader, File, readLine, delete, exists, read, write Java supports a rich variety of file handling, with the ability to read and write to files, to check if a file exists, to delete a file, to create a directory. It uses exception handling to report on errors, and has a number of wrapper classes to simplify access. Such as BufferedReader, which provides a more efficient handling of files.
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.