What is Java? Explain Java Features.

 What is Java ? Explain Java Features.

 - Java is a programming language that :- 

                                                                - Is exclusively object oriented.

                                                                - Has full GUI support.

                                                                - Has full network support.

                                                                - Is platform independent.

                                                                - Executes stand-alone or "on-demand" in web browser as applets.

Features of Java :

                               1) Simple

                                                2) Secure

                                                3) Portable

                                                4) Object - Oriented

                                                5) Robust

                                                6) Multithreaded

                                                7) Architecture - natural

                                                8) Interpreted

                                                9) High performance

                                              10) Distributed

                                              11) Dynamic

(1) Simple : 

                    - Java was designed to be easy for the professional programmer to learn and use effectivity.

                    - If you already understand the basic concept of Object Oriented Programming , learning java will be even easier.

(2) Security :

                - Security is the benefit of Java.

                   - Java system not only verifies all memory access but also ensure that no viruses are communicated with an applet.

(3) Portable : 

                        - The most significant contribution of java over other language is its portability.

                        - Java programs can be easily moved from one computer system to another.

                        - Java ensures portability in two ways : 

                                      (1) Java compiler generates byte code instruction that can be implemented on any machine.

                                      (2) The size of the primitive data types is machine independent. 

                                         

(4) Object - Oriented :

                                  - Java is a true Object Oriented Language.

                                        - All program code and data reside within object and classes.

                                        - The object model in java is simple and easy to extend.

(5) Robust(healthy , strong) :

                                                       - The ability to create robust programs was given a high priority in the design of java.

                                                       - To given reliability , java has strict compile time and run-time checking for codes.

                                                       - To better understand how java is robust , consider two main reasons for program failure : 

                                                       1) Memory management mistakes 

                                                       2) Mishandled exceptional conditions

(6) Multithreaded :

                              - Java was designed to meet the real-world requirement of creating interactive , networked programs.

                                    - Java supports multithreaded programming.

                                    - Which allows you to write programs that do many things simultaneously.

(7) Architecture-Natural : 

                                        - A central issue of java programmers was that code longevity and portability.

                                        - Operating system upgrades , and changes in core system resources can AI combine to make a program malfunction.

                                        - The java designer made several hard decisions in the java language.

                                        - The java virtual machine in an attempt to alter this situation.

                                        - Their goal was "Write Once, Run Anywhere , Any Time, forever".

(8) Interpreted : 

                       - A computer language is either compiled or interpreted.

                           - Java combines these approaches thus making java a two-stage system.

                           - Java compiler translates source code into byte code instructions.

                           - Byte codes are not machine instructions.

                           - So java interpreter generates machine code.

                           - It can be directly executed by the machine that is running the java program.

                           - Java is both a compiled and an interpreted language.

(9) High Performance : 

                                     - Java performance is impressive for an interpreted language.

                                            - Mainly due to the use of intermediate byte code.

(10) Distributed :

                           - Java is designed for the distributed environment of the internet , because it handles TCP/IP protocols.

                                - Java also supports Remote Method Invocation(RMI).

                                - This feature enables a program to invoke methods across a network.

(11) Dynamic :

                        - Java is capable of dynamically linking in new class libraries , methods and object.

                            - Java can also determine the type of class through a query , making it possible to either dynamically link or abort the program.