JAVA Chapter 1 - What is Java :- java is a programming language expressly designed for use in the distributed environment of the Internet.... It was designed to have the look and feel of the C++ language, but it is simpler to use than C++ and enforces an object-oriented programming model... java can be used to create complete applications that may run on a single computer or be distributed among servers and clients in a network. It can also be used to build a small application module or applet for use as part of a Web page... applets make it possible for a web page user to interact with the page.... Java is :- object oriented - In Java, everything is an object. Java can be easily extended since it is based on the object model. platform independent - unlike many other programming languages including C and C++, when Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual machine (JVM) on whichever platform it is being run. Simple - java is designed to be easy to learn. If you understand the basic concept of OOP,Java would be easy to master. secure - With Javas secure feature, it enables to develop virus-free, tamper-free systems. authentication techniques are based on public-key encryption. architectural-neutral - java compiler generates an architecture-neutral object file format, which makes the compiled code to be executable on many processors, with the presence of Java runtime system. portable - being architectural-neutral and having no implementation dependent aspects of the specification makes Java portable. compiler inJava is written in ANSI C with a clean portability boundary which is a POSIX subset. robust - java makes an effort to eliminate error prone situations by emphasizing mainly on compile time error checking and runtime checking. multithreaded - with Javas multithreaded feature, it is possible to write programs that can do many tasks simultaneously. this design feature allows developers to construct smoothly running interactive applications. terpreted - java byte code is translated on the fly to native machine instructions and is not stored anywhere. The development process is more rapid and analytical since the linking is an incremental and lightweight process. high performance - with the use of Just-In-Time compilers, Java enables high performance. Distributed - java is designed for the distributed environment of the internet. dynamic - java is considered to be more dynamic than C or C++ since it is designed to adapt to an evolving environment. java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time. .........................................Chapter 1 Close .................................
Posted on: Sun, 20 Jul 2014 16:17:51 +0000
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