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  • INTERVIEW QUESTIONS J2EE JAVA DETAILS
    Question :
    What is JVM?
    Category Java Interview Questions
    Rating (0.4) By 1125 users
    Added on 8/8/2005
    Views 3915
    Rate it!
    Answers:

    An abstract computing machine, or virtual machine , JVM is a platform - independent execution environment that converts Java bytecode into machine language and executes it.



    Java Virtual Machine is the one which change the source code in to the code that is executable through the system so that this helps in making the Java Platform independent as this coude is accessible in any of the operating system



    Posted by: Rahul Sehgal    

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    jvm(java virtual machine)is the compiler of java which convert source code to byte code, which is further intepreted into machine code



    Posted by: deepak srivastava    

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    JVM - Java Virtual Machine.

    JVM consist of following components:-

    1)Byte-code verifier :- It verify the byte-code ,it check's for unusual code.

    2)Class Loader :- After verifying Class Loader will load the byte-code into the memory for execution.

    3)Execution engine :-
    It further consist of 2 parts :-
    a)Interpreter :- It interpret the code & run.
    b)JIT(Just-in-Time Interpreter)
    JVM Hotspot defines when to use Interpreter or JIT.

    4)Garbage Collector:- It periodically check for the object on heap , whose link is broken
    So it can collect the garbage from Heap.

    5) Security Manager :- It constantly monitors the code.It is 2nd level of security.[1st level is Byte-code verifier ].



    Posted by: Kamal Trivedi    

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    java programs are compiled intoana assembly language for an imaginary machine is called java vortual machine



    Posted by: muneeswari    

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    JVM
    JVM stands for Java Virtual Machine. As the name indicates, it does not a real hardware machine but a software layer which resembles an hardware platform. JVM helps to run java programs on different Operating system platforms. The JVM will be different for different Operating Systems. ie there will be separate JVM for Windows and Linux. Now i am going to explain how Java achieves platform independents with the helps of JVM. We can write the java program on any platform. The source program is then converted to byte code using a Java compiler. The compiler will be different for different platforms. The byte code can be executed on any platform where there exist JVM.



    Posted by: Asif C    

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    JVM stands for Java Virtual Machine. It is the engine that drive the java code. It is the medium which converts java code to bytecode which get translated on different machine and hence it makes it platform/os independent.



    Posted by: Ravi S Singh    

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    JVM generates .class file that we can able to run in any OS but it should have a JVM within it.Because JVM is system dependent.



    Posted by: venkatesh    

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    jvm stands for java virtual machine.where it converts source code into byte code but these code also not accesable by machine. where jvm play a important role. it converts Byte code to machine code.



    Posted by: jaywant topno    

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    Java is platform independant because of JVM i.e Java Virtual Machine. As different computers with different oerating system hav their own JVM,when we submit '.class' file to any ooperating system,JVM interprete the bytecode into machine level language.



    Posted by: Leena Patil    

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    JVM(java virtual machine )is java run time environment(JRE)..which converts byte code(suppose A.JAVA) in to machine languge (A.CLASS) so it can execute on any platform.



    Posted by: ankit kumar     

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    java virtual machine is a program which is responsible to accept byte code and translates them into machine code for the specific machine on which the java program is running.
    A program of JVM is written into "c language" and JVM is machine dependent.java virtual machine is also responsible to allocates the necessary memory needed by the java program.java virtual machine is also responsible to deallocate a memory space.java virtual machine is the heart of entire java program execution process.



    Posted by: rajnayan    

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