Java Online Training

Java Online Training - Java Program | Major characterstics of Java | Latest Version

Java Online Training - Java Program  is a general purpose, high-level programming language developed by Sun Microsystems. A small team of engineers, known as the Green Team, initiated the language in 1991. Java was originally called OAK, and was designed for Java Online Training handheld devices and set-top boxes. Oak was unsuccessful, so in 1995 Sun changed the name to Java and modified the language to take advantage of the burgeoning World Wide Web.

When Java Program assets

Later, in 2009, Oracle Corporation acquired Sun Microsystems and took ownership of two key Sun software assets: Java and Solaris Java Online Training.

The major characteristics of Java are

               The programs you create are portable in a network. Your source program is compiled into what is Java calls bytecode, which can be run anywhere in a network on a Java Online Training server or client that has a Java virtual machine. The Java virtual machine interprets the bytecode into code that will run on the real computer hardware. This means that individual computer platform differences such as instruction lengths can be recognized and accommodated locally just as the program is being executed. Platform-specific versions of your program are no longer needed.
The Java Online Training code is robust, here meaning that, unlike programs written in C++ and perhaps some other languages, the Java Programming objects can contain no references to data external to themselves or other known objects. This ensures that an instruction can not contain the address of data storage in another application or in the Java Online Training operating system itself, either of which would cause the program and perhaps the operating system itself to terminate or "crash." The Java virtual machine makes a number of checks on each object to ensure integrity.

              Java is object-oriented, which means that, among other characteristics, an object Java Online Training can take advantage of java being part of a class of objects and inherit code that is common to the class. Objects are thought of as "nouns" that a user might relate to rather than the traditional procedural "verbs." A method can be thought of as one of the object's capabilities or behaviors.In addition to being executed at the client rather than the server, a Java applet has other Learn Java Online characteristics designed to make it run fast.

Development of  java program

Now a days java program is a commonly used foundation for developing and delivering content on the Web. According to Java Online Training Oracle, there are more than 9 million Java developers (about java) worldwide and more than 3 billion mobile phones run Java.

Download Java Free

The official Java website provides links to freely download the latest version of Java. You can use the Java website Learn Java Online to learn more about downloading Java, verify Java is installed on your computer, remove older versions, troubleshoot Java or report an issue. After installing Java, you will need to restart your Web browser.

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Java Online Training

What is the Java Programming

Java is a recently developed, concurrent, class-based, object-oriented programming and runtime environment, This is a small description for what is java programming .

consisting of:

·         A programming language

·         An API specification

·         A virtual machine specification

Java has the following characteristics:

·         Object oriented - Java provides the basic object technology of C++ with some enhancements and some deletions about java programming.

·         Architecture neutral - Java source code is compiled into architecture-independent object code. The object code is interpreted by a Java Virtual Machine (JVM) on the target architecture.

·         Portable - Java implements additional portability standards. For example, ints are always 32-bit, 2's-complemented integers. User interfaces are built through an abstract window system that is readily implemented in Solaris and other operating environments.

·         Distributed - Java contains extensive TCP/IP networking facilities. Library routines support protocols such as HyperText Transfer Protocol (HTTP) and file transfer protocol (FTP).

·         Robust – How to Robust are used Both the Java compiler and the Java interpreter provide extensive error checking. Java manages all dynamic memory, checks array bounds, and other exceptions.

·         Secure - Features of C and C++ that often result in illegal memory accesses are not in the Java language. The interpreter also applies several tests to the compiled code to check for illegal code. After these tests, the compiled code causes no operand stack over- or underflows, performs no illegal data conversions, performs only legal object field accesses, and all opcode parameter types are verified as legal.

·         High performance - Compilation of programs to an architecture independent machine-like language, results in a small efficient interpreter of Java programs. The Java environment also compiles the Java bytecode into native machine code at runtime.

·         Multithreaded - Multithreading is built into the Java language. It can improve interactive performance by allowing operations, such as loading an image, to be performed while continuing to process user actions.

·         Dynamic - Java does not link invoked modules until runtime.

·         Simple - Java is similar to C++, but with most of the more complex features of C and C++ removed.

Java does not provide:

o    Programmer-controlled dynamic memory

o    Pointer arithmetic

o    struct

o    typedefs

o    #define

JRE Components

The JRE is the software environment in which programs compiled for a typical JVM implementation can run. The runtime system includes:

·         Code necessary to run Java programs, dynamically link native methods, manage memory, and handle exceptions

·         Implementation of the JVM

The following figure shows the JRE and its components, including a typical JVM implementation's various modules and its functional position with respect to the JRE and class libraries.

How to learn Java check the video for Demo 

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