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sreelatha
java
3 Answer(s)      6 years and 4 months ago
Posted in : Java Interview Questions



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August 13, 2008 at 10:21 AM


hai friend....
the platform independence of java is juz bcoz of THE BYTECODE,can be called as java's magic....
ByteCOde is a highly optimized set of instructions designed to be executed by the java run-time system, which is called JVM(java virtual machine).
So JVM is an Interpreter for bytecode.
most modern languages like c++ are compiled to executable code, not interpreted.

Translating a java program into bytecode helps makes it much easier to run a program in a wide variety of environments....the reason is only the JVM needs to be implemented for each platform....



For the languages like C++, we need to implement full compiler targeted for each platform....but building compilers are timeconsuming and too expensive...


Once the runtime packages exists for a given system, any java program can run on it...



Remember this....the details of jvm differs from platform to paltform...but all interpret the same java byte code...


The interpretation of BYTECODE is the best and also the easiest way to create truly portable programs....

thanks and regards
prashu
prashobvee@gmail.com


August 13, 2008 at 10:44 AM


Hi friend,

Java is Platform Independent

The programs are coded in higher level languages such as C/C++, its source code require
to be compiled into native machine language that platform so this program is
made executable.

Java compiler does not compile Java source files into machine language
It compiles the source code into bytecodes. These bytecodes are platform independant.
Bytecode compiled programs are executed by the Java interpeter.
It it converts those bytecodes into native machine code.
It executes through JVM which is specific to environment that the program running.

Java compliler compiling the ".java" file and converted into .class file which is byte code.

This byte have capablility to run on any Operating System e.g Window,Linux.
It follows "Write once run anywhere".

jvm is used to any platform converted.

it is not tied to any hardware or any operating system. The program
made in java can be run anywhere or any machine.


August 13, 2008 at 10:45 AM


Thanks

vineet


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