Getting Started with Java JDK (Java Development Kit)

<div style="text-align: justify;"><b><span style="color: magenta;">Part 2  </span>Start with <a href="http://theintecs.blogspot.com/2013/08/introduction-of-java-programming.html" target="_blank"><span style="color: red;">part 1</span> </a>is very understand</b><br /><b><br /></b>Introduction Fundamentals of Java quickly became easier with Intecs. This site is for Java programmers who want to use the Java programming language to create applications using the basics of Java. This site is for beginners and for advanced Java programmers that do not require prerequisite knowledge of Java. To start using Java you must have a basic understanding of programming concepts.</div><div style="text-align: justify;"><br /></div><div style="text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="http://blog.sudobits.com/wp-content/uploads/2011/05/java-logo.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://blog.sudobits.com/wp-content/uploads/2011/05/java-logo.jpg" /></a></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">After going through all the tutorials on this site, you should learn the basic concepts and features of the Java programming language, including exceptions, swing GUI programming, under Collections etc. A lot of code examples used throughout exercise to better understand the language.</div><div style="text-align: justify;">All advertisements and programs on this site are compiled and run with JDK .</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;"><b>Download</b> :<span style="color: red;"> </span></span><strong><a href="http://www.oracle.com/technetwork/java/javase/downloads/index.html" target="_blank"><span style="color: red;">JDK and JRE </span></a></strong></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>Java Architecture</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">The Java environment consists of a number of system components. You can use these components at compile time to create the Java program at runtime to execute the program. Java achieves its independence with the creation of programs designed to run on the Java virtual machine, rather than any specific computer system.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"></div><ul><li>After writing a Java program, you are using a compiler that reads the instructions in the program and translated into a machine-independent format called bytecode.</li><li>Bytecode files, which are very compact, easily transported through a distributed system such as the Internet.</li><li>The compiled Java code (code resulting byte) will be executed at run time.</li></ul><br /><div style="text-align: justify;"><b><span style="color: #cc0000;">Java programs can be written and executed in two ways:</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"></div><ul><li>Stand-alone application (a Java Swing)</li><li>Applet that runs in a web browser (eg Internet Explorer)</li></ul><br /><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><br /></span></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>Java source code</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">A Java program is a set of one or more Java classes. A Java source file can contain more than one class definition and has an extension of Java .. Each class definition in the source file is compiled into a separate class file. The name of the compiled file consists of the name of the class. Class as an extension. Before proceeding further in this section, I suggest you go through the "basic elements of the following languages.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Below is an example of Java code for the traditional Hello World program. In essence, the idea behind this Hello World program is to learn how to create a program, compile and run. To create the Java source code you can use any editor (pad / Edit Plus text are my favorite), or you can use an IDE like Eclipse.</div><div style="text-align: justify;"><br /></div><pre style="line-height: 22.22222328186035px;"><span style="background-color: #b6d7a8;">public class HelloWorld {<br /> public static void main(String[] args) {<br /> System.out.println("Hello World");<br /> }//End of main<br />}//End of HelloWorld Class</span></pre><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span class="style4" style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;"><b><span style="color: #cc0000;">Output</span></b></span><br /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;"><span style="color: #8e7cc3;">Hello World</span></span></div><div style="text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;"><br /></span></div><div style="text-align: justify;"><b><u>Program information</u></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">I have created a class called "HelloWorld," which contains a simple main function within it. The class keyword specifies that we are defining a class. The name of a public class is written exactly the file name (case sensitive). All java programs begin execution with a method called main (). main execution method has the following signature: void main (String args []) public static declare this method as public transport which is accessible from outside the class to the JVM when trying to find the program to start. her. And 'necessary that the method is declared with a void return type (ie, no arguments are returned by the method). The main method contains an array of string arguments that can contain the command line arguments. The braces {and} mark the beginning and the end of the class. The program contains "System.out.println (" Hello "); 'a line that tells the computer to print a line of text to say,' Hello World 'The semicolon.'; 'End the line of code.' s double slashes '/ comments /' are used which can be used to describe what he is doing a source code. All right of the bars in the same line is not filled in, as they are only comments in a program.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b>Java Main method statements</b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #073763;"><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">class MainExample1 {public static void main(String[] args) {}}</span><br style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;" /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">class MainExample2 {public static void main(String []args) {}}</span><br style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;" /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">class MainExample3 {public static void main(String args[]) {}}</span></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">They are all 3 main valid method shown above takes a single argument array of strings.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>Compile and run an application</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">To compile and run the program you need the JDK distributed by Sun Microsystems. The JDK contains documentation, examples, installation instructions, class libraries and packages, and instruments. Download editor like Textpad / EditPlus to write the code. You need to keep the source code, with an extension of Java .. The file name must be the name of the public class in the file.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Steps to follow to save, compile and run a Java application</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #073763;"><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">Step 1:Save the program With .java Extension.</span><br style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;" /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">Step 2:Compile the </span><span class="IL_AD" id="IL_AD9" style="background-attachment: scroll !important; background-color: white; background-image: none !important; background-position: 0% 50%; background-repeat: repeat repeat !important; border-bottom-color: rgb(0, 153, 0) !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; cursor: pointer !important; display: inline !important; float: none !important; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; padding: 0px 0px 1px !important; position: static; text-align: start; text-decoration: underline !important;">file from</span><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;"> DOS prompt by typing javac <filename>.</span><br style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;" /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">Step 3:Successful Compilation, results in creation of .class containing byte code</span><br style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;" /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">Step 4:Execute the file by typing java <filename without extension></span></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>Java Development Kit</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Java Developer Kit is distributed by Sun Microsystems. The JDK contains documentation, examples, installation instructions, class libraries and packages and tools</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>javadoc</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">The javadoc tool provided by Sun is used to produce the documentation of an application or a program,</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>Jar files</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">A JAR file is used to group related class files into a single file for more compact storage, distribution and transmission.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>PATH and CLASSPATH</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">The following are general programming errors, which I think every beginning java programmer find. Here's a solution on how to solve problems when running on a Windows machine.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: #351c75;">1. "Javac 'is not recognized as an internal or external command, program or batch file</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">When you get this error, you must conclude that the operating system can not find the compiler (javac). To resolve this error, you must set the PATH variable.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b>How to set the PATH variable?</b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">First, the PATH variable is set so that you can compile and run programs from any directory without having to type the full path of the command. To set the path to the JDK on your system (Windows XP), add the full path to the JDK <version> \ bin to the PATH variable. Set the path follows on a Windows computer:</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">un. Click Start> Click on "My Computer" and click "Properties"</div><div style="text-align: justify;">b. Variables Click Advanced> Environment.</div><div style="text-align: justify;">c. Add the location of bin folder of JDK installation for PATH in User Variables and System Variables. A typical value for the path is:</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px;">C:\jdk<version>\bin</span><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px;"> </span>(JDK <version is just the name of the directory where you installed the JDK)</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">If there is already some elements of the PATH variable should add a semicolon and then add the previous value (version is replaced with the version of the JDK). The new path takes effect in each new Command Prompt window you open after setting the PATH variable.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><strong style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;"><span style="color: #20124d;">2. Exception in thread “main” java.lang.NoClassDefFoundError: HelloWorld</span></strong></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">If you receive this error, Java can not find the file compiled bytecode, HelloWorld.class.If both class files and source code are in the same working directory, and if you try to run the program from the current working directory that the program should run smoothly as, try to find the Java class file. represents the current directory. If the class files are present in another directory than the java file we need to set the CLASSPATH pointing to the directory containing the compiled class files.CLASSPATH can be adjusted as follows on a Windows computer:</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">a. Click Start > Right Click “My Computer” and click on “Properties”</span><br /><span style="background-color: white; font-family: verdana; font-size: 13.333333969116211px; line-height: 22.22222328186035px; text-align: start;">b. Click Advanced > Environment Variables.</span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Add the location of the folder class' that contains all Java classes in the user variables.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">If there are already some items in your CLASSPATH must add a semicolon and then add the new value. The new classpath takes effect in each new Command Prompt window you open after setting the classpath.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div>

Getting Started with Java JDK (Java Development Kit)

Part 2   Start with part 1 is very understand Introduction Fundamentals of Java quickly became easier with Intecs. This site is for Java pr...

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Introduction of Java Programming

<div style="text-align: justify;"><span style="color: #cc0000; font-size: large;"><b>Introduction to Computing with Java</b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Java is a simple but powerful programming and object-oriented and is in many ways similar to C + +. Java originated in Sun Microsystems, Inc. in 1991. E 'was conceived by James Gosling, Patrick Naughton, Chris Warth, Ed Frank, and Mike Sheridan at Sun Microsystems, Inc. has been developed to provide a platform-independent programming language. This site provides an introduction to programming in Java, with many examples of Java. It is a complete course for beginners Advanced Java Programming for Java.<br /><br /><div style="text-align: center;"><img height="245" src="http://www.digitaltrends.com/wp-content/uploads/2010/11/java-logo.jpg" width="400" /></div></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: #0b5394;"></span></b><br /><a name="more"></a><b><span style="color: #0b5394;"><br /></span></b><br /><b><span style="color: #0b5394;">Platform independent</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Unlike many other programming languages ​​such as C and C + +, Java is compiled, it is compiled into platform specific machine, not the platform independent bytecode. This byte code is distributed via the Internet and interpreted by the virtual machine (JVM) in which the platform is running.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: #0b5394;">Java Virtual Machine</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: #38761d;">What is the Java Virtual Machine? What is your role?</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Java was designed with a concept of "write once, run anywhere." Java Virtual Machine has a central role in this concept. The JVM is the environment in which Java programs are executed. This is a software that is distributed on top of real hardware and operating system. When you compile the source code (. Java), which translates bytecode and then placed in the file (. Class). The JVM executes this bytecode. So Java bytecode can be considered as the machine language of the JVM. A JVM can either interpret the bytecode one instruction at a time or the bytecode can be compiled further for the real microprocessor using what is called a just-in-time. The JVM should be implemented on a particular platform before compiling programs can run on that platform.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="font-size: large;"><b><span style="color: #cc0000;">OOP  </span><span style="color: #e06666;">(</span></b><span style="color: #e06666;"><span style="background-color: white; font-family: verdana;">Object Oriented Programming</span><b>)</b></span></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Since Java is an object-oriented programming has the following features:</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"></div><ul><li>Code reuse</li><li>The emphasis on data rather than procedure</li><li>Data is hidden and can not be accessed by external functions</li><li>Objects can communicate among them through the functions</li><li>New data and functions can be easily addedJava has powerful features. </li></ul><br /><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: #a64d79;">The following are some of them: -</span></b></div><br /><ul><li style="text-align: justify;">Simple</li><li style="text-align: justify;">Reusable</li><li style="text-align: justify;">Portable (platform independent)</li><li style="text-align: justify;">Distributed</li><li style="text-align: justify;">Robust</li><li style="text-align: justify;">Secure</li><li style="text-align: justify;">High Performance</li><li style="text-align: justify;">Dynamic</li><li style="text-align: justify;">Screwed</li><li style="text-align: justify;">Performed</li></ul><br /><div style="text-align: justify;"><b>Object-oriented programming</b> is a method of execution in which the programs are organized in cooperative collection of objects, each of which represents an instance of a class, and whose classes are all members of a hierarchy of classes connected by inheritance relationships.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b>Concepts of object-oriented programming</b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Four principles of object-oriented programming are</div><br /><ol><li style="text-align: justify;">Abstraction</li><li style="text-align: justify;">Encapsulation</li><li style="text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: 13px; line-height: 20px;">Inheritance</span></li><li style="text-align: justify;">Polymorphism</li></ol><br /><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: purple;">Abstraction</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of objects and thus provide the conceptual boundaries well defined, regarding the point of view of the viewer.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: purple;">Encapsulation</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Encapsulation is the process of partitioning the elements of an abstraction that constitute its structure and behavior, encapsulation serves to separate the contractual interface of an abstraction and its implementation.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><u>Encapsulation</u></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">* Hides the implementation details of a class.</div><div style="text-align: justify;">* Forces the user to use a data access interface</div><div style="text-align: justify;">* It makes the code easier to maintain.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="background-color: white; font-family: verdana; font-size: 13px; line-height: 20px;"><b><span style="color: purple;">Inheritance</span></b></span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Inheritance is the process by which an object acquires the properties of another object.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b><span style="color: purple;">Polymorphism</span></b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b>Polymorphism</b> is the existence of classes or methods in different ways or only name that denotes different</div><div style="text-align: justify;">implementations.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;">Java is distributed</span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">With a wide range of routine to handle the TCP / IP protocol such as HTTP and FTP java can open and access objects across the network via URLs.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;">Java is multithreaded</span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">One of the strengths of the Java language is that it allows multiple threads that execute the same program simultaneously on a single Java program can have many different threads running independently and continuously. Multiple Java applets can run in the browser at the same time sharing the CPU time.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;">Java is secure</span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Java was designed to allow safe execution of code across the network. To make sure Java many of the features of C and C + + have been removed. Java does not use. Java programs can not access arbitrary addresses in memory.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;">Garbage collection</span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Automatic garbage collection is another great feature of Java with the memory avoiding accidental damage. As in C + +, Java has a new operator to allocate memory on the heap for a new object. But it uses operator delete to free memory, as it does in C + + to free the memory when you no longer need the object. This is done automatically by the garbage collector.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><span style="color: #cc0000; font-size: large;">Java Applications</span></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Java has evolved from a simple language that provides interactive dynamic content for web pages with a programming language by companies registered mainly suitable for the development of important applications and critics. Today, it is used for many types of applications, including Web-based financial applications, gaming applications, embedded systems, distributed business applications, mobile applications, image processors, desktop applications, and more. This website describes the basic components of java that say some examples of Java, along with some Java tutorials.</div>

Introduction of Java Programming

Introduction to Computing with Java Java is a simple but powerful programming and object-oriented and is in many ways similar to C + +. Java...

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