Question : Explain the features of Java? (15)
Ans : Main
features of Java are:
1)
Compiled and Interpreter:- has both Compiled and Interpreter Feature
Program of java is First Compiled and Then
it is must to Interpret it .First of all The Program of java is Compiled then
after Compilation it creates Bytes Codes rather than Machine Language. Then
After Bytes Codes are Converted into the Machine Language is Converted into the
Machine Language with the help of the Interpreter So For Executing the java
Program First of all it is necessary to Compile it then it must be Interpreter.
2)
Platform
Independent:- Java Language is Platform Independent means
program of java is Easily transferable because after Compilation of java
program bytes code will be created then we have to just transfer the Code of
Byte Code to another Computer. This is not necessary for computers having same Operating System in which the code of the java is
Created and Executed After Compilation of the Java Program We easily Convert
the Program of the java top the another Computer for Execution.
3)
Object-Oriented:- We
Know that is purely OOP Language that is all the Code of the java Language is
Written into the classes and Objects So For This feature java is Most Popular
Language because it also Supports Code Reusability, Maintainability etc.
4)
Robust and
Secure:- The Code of
java is Robust and Means to first checks the reliability of the code before
Execution When We trying to Convert the Higher data type into the Lower Then it Checks the
Demotion of the Code the It Will Warns a User to Not to do this So it is called
as Robust Secure : When We convert the Code from One
Machine to Another the First Check the Code either it is Effected by the Virus
or not or it Checks the Safety of the Code if code contains the Virus then it
will never Executed that code on to the Machine.
5)
Distributed:- Java is Distributed Language
Means because the program of java is compiled onto one machine can be easily
transferred to machine and Executes them on another machine because facility of
Bytes Codes So java is Specially designed For Internet Users which uses the
Remote Computers For Executing their Programs on local machine after
transferring the Programs from Remote Computers or either from the internet.
6)
Simple
Small and Familiar:- is a simple
Language Because it contains many features of other Languages like c and C++
and Java Removes Complexity because it doesn’t use pointers, Storage Classes
and Go to Statements and java Doesn’t support Multiple Inheritance.
7)
Multithreaded
and Interactive:- Java uses
Multithreaded Techniques For Execution Means Like in other in Structure
Languages Code is Divided into the Small Parts Like These Code of java is
divided into the Smaller parts those are Executed by java in Sequence and
Timing Manner this is Called as Multithreaded In this Program of java is divided
into the Small parts those are Executed by Compiler of java itself Java is
Called as Interactive because Code of java Supports Also CUI and Also GUI
Programs
8)
Dynamic and Extensible Code:- Java has Dynamic and Extensible Code Means With the Help of
OOPS java Provides Inheritance and With the Help of Inheritance we Reuse the
Code that is Pre-defined and Also uses all the built in Functions of java and
Classes
9)
Distributed:- Java is a distributed language which means that the program
can be design to run on computer networks.
Java provides an extensive library of classes for communicating , using TCP/IP
protocols such as HTTP and FTP. This makes creating network connections much
easier than in C/C++. You can read and write objects on the remote sites via
URL with the same ease that programmers are used to when read and write data
from and to a file. This helps the programmers at remote locations to work
together on the same project.
10)
Secure: Java was designed with security in mind. As Java is
intended to be used in networked/distributor environments so it implements
several security mechanisms to protect you against malicious code that might
try to invade your file system. For example: The absence of pointers in Java
makes it impossible for applications to gain access to memory locations without proper authorization
as memory allocation and referencing model is completely opaque to the
programmer and controlled entirely by the underlying run-time platform .
11)
Architectural Neutral: One of the key features of Java that makes it different
from other programming languages is architectural neutral (or platform
independent). This means that the programs written on one platform can run on
any other platform without having to rewrite or recompile them. In other words,
it follows 'Write-once-run-anywhere' approach. Java programs are compiled into
byte-code format which does not depend on any machine architecture but can be
easily translated into a specific machine by a Java Virtual Machine (JVM) for
that machine. This is a significant advantage when developing applets or
applications that are downloaded from the Internet and are needed to run on
different systems.
12)
Portable : The portability actually comes from
architecture-neutrality. In C/C++, source code may run slightly differently on
different hardware platforms because of how these platforms implement
arithmetic operations. In Java, it has been simplified. Unlike C/C++, in Java
the size of the primitive data types are machine independent. For example, an
int in Java is always a 32-bit integer, and float is always a 32-bit IEEE 754
floating point number. These consistencies make Java programs portable among
different platforms such as Windows, Unix and Mac.
13)
Interpreted: Unlike most of the programming languages which are either
complied or interpreted, Java is both complied and interpreted The Java
compiler translates a java source file to bytecodes and the Java interpreter
executes the translated byte codes directly on the system that implements the
Java Virtual Machine. These two steps of compilation and interpretation allow
extensive code checking and improved security .
14)
High performance: Java programs are complied to portable intermediate form
know as bytecodes, rather than to native machine level instructions and JVM
executes Java bytecode on. Any machine on which it is installed. This
architecture means that Java programs are faster than program or scripts
written in purely interpreted languages but slower than C and C++ programs that
compiled to native machine languages. Although in the early releases of Java,
the interpretation of by bytecode resulted in slow performance but the advance
version of JVM uses the adaptive and Just in time (JIT) compilation technique
that improves performance by converting Java bytecodes to native machine
instructions on the fly.
