In the classic sense of software development, programs are
coded in higher level languages such as C/C++, then that
source code needs to be compiled into native machine
language specific to that platform so that the program is
made executable.
Java compiler on the other hand does not compile Java source
files into native machine language, instead it compiles the
source code into bytecodes. These bytecodes are platform
independant i.e. in other words specific to to the Java
Virtual Machine specification. This enables platform
independant compilation.
When the bytecode compiled programs are executed thru the
Java interpeter, it converts those bytecodes into native
machine code and executes them thru the JVM which is
specific to host environment it is running on. This enables
platform specific execution.
Hi... Java is a platform independent language.After
compiling the ".java" file ,that will be converting into
the ".class" file,which is a byte code having the
capability run on any OS.Basing on the concept byte code
java achieving the platform independent,it leads to "Write
onece run anyware".
Java is plateform independent language because it is not
tied to any hardware or any operating system. The program
made in java can be run anywhere or any machine.
When you write the program for any programming language it
is called (source program), and it will have the extension
depending upon the language. For example, the C language
will have the extension ".c" and ".cpp" in C++.
When you compile the file or (source program), you will get
the ".exe" extension. This ".exe" file is executed by the
operating system in the C & C++ program.
If you are writing the program and compile it in one
operating system, you cannot take the same ".exe" file to
another operating system for extension. That means, this
program depends upon the operating system for its execution.
In Java, when you write the program, you will have
the ".java" file. And when it is compiled, you will get
the ".class" file. The ".class" file is executed by the
Java Virtual Machine (JVM). If you have the JVM, you can
execute the java program anywhere under operating system.
That means, that Java is PLATFORM INDEPENDENT.
when java code is compiled a bytecode is generated which is
independent of the system.This bytecode is fed to the JVM
(java virtual machine)which is resided in the system.Since
every system has its own JVM,it does'nt matter where u
compile the source code.The bytecode generated by the
compiler can be interpreted by any JVM of any machine.
Hence it is called platform-indepented language.
java is platform independent due to the concept of J.I.T
after compilation of java source code filename.class file
prepared by the J.V.M is called bytecode but j.v.m is
platform dependent that bytecode is further interpreate by
J.I.T in the machine code
by this process java becomes platform independent
A language is platform independant if it satisfies the
following 3 conditions :
1. It is compiled in a platform neutral manner i.e. object
code obtained after compilation doesn't contain any
Operating System specific information and doesn't follow
O.S. specification formats.
2. Language provides its own runtime environment for
execution of its applications.
3. Language provides comprehensive library to act as an
interface for O.S. services i.e. applications developed in
the language doesn't directly reference any O.S. specific
functionality.
Java follows all these conditions.
Platform Independent means the process in which certain
languages is capable of running on all types of Operating
System.
Java is platform independent bcoz In java when we
execute the source code,it generates the class file
comprising the bytecode.Byte code are easily interpreted by
JVM(interpreter)which is available with every type of O.S
we install
I am giving the answer more clear.
JVM is O.S Dependent ,i.e different operating systems require
their own specific jvm.
the thing what is platform independent is
the byte code generated by java compiler "javac"
this byte code can be run on any real world object as long as
jre(consists jvm) is exists.jre should be under some
operating system.
java is platform independent because it follows the three
basic rules
According to these rule there should not any coupling
between operating system and java program /application
1:-Application developing time coupling
JAVA never use any operating system function in developing
java application
2 compilation time coupling
that is only Java Run Time environment is responsible to
load and compile the any java program
hence there is no role of operating system
3:-Execution time coupling
in java Run Time environment JVM has responsibility to
execute the java program hence there is no role of OS
since java follow these three rule hence java is a platform
language
Can we access private data outside of the class directly in
java programming language? Why There is no runtime checking
in java, which leads to access the private data directly
outside of a class?
They had given one progam
final HashMap hm=new HashMap();
public void show()
{
hm.put("name",value);
}
in this prg here the final hashtable value can be changed in
put method,its the prg run?
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