JVM for various OS

I new to Java,I have one basic doubt regarding JVM,
Is JVM designed by the OS developers or SUN itself design the different JVMs for the different Operating Systems?

Hi harish...
Because of Java portability feature .. the java program's transformation process, from source code to machine executable, into 2 steps....
* 1 .Step..
i.e example.java to example.class ( using "javac" compiler it is converted to "bytecode" i.e "class" file)
there is nothing big deal about this "class" file (bytecode).Its just a simple flat file having JVM(java virtual machine) instructions and symbol table of java's flavour( also called runtime constant pool table, having references to runtime variables and methods etc.. that is need at linking process, to execute the program)...
* 2.Step..
tranforms the class file ie..
from example.class to machine executable(using JVM )
JVM is interpreter that reads JVM instructions from the class file and transfroms them into appropriate machine equivalent code of the host machine...
purly speaking interpreter is more robust than compiler .. for extremely runtime error prone programs...and more over JVM instructions are siblings to assembly code and thus requires interpreter rathar than compiler...because at the end of the any CPU executes only one instruction at a time....
Hope I answered your question.....

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*&      Form get_data
      text
     -->P_ITAB1 text
     -->P_ITAB2 text
form get_data tables   itab1 structure pa0001
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