INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: Explain working of Java Virtual Machine(JVM).

Answer: JVM is an abstract computing machine like any other real computing machine which interprets the byte code( .class file which contains virtual machine instructions ) to a machine dependent native code. The output of JVM i.e the native code contains low level instructions which is easily understandable by the micro processors which process the native code to give the desire output.

JVM is an abstract computing machine like any other real computing machine which interprets the byte code( .class file which contains virtual machine instructions ) to a machine dependent native code. The output of JVM i.e the native code contains low level instructions which is easily understandable by the micro processors which process the native code to give the desire output. Source: CoolInterview.com

JVM(Java virtual machine):it is the runtime environment for java programs and it contains the following :
1)class loader
2)byte code verifier
3)jit compiler and interpreter
java is a platform independent language which means it can be operated in any operating system

when you execute a program in C && C++ a .exe file is obtained which contains the source code
and operating system details where as when you execute a program in java a .class file is created which contains the byte code(source code) only.It is the JVM which links this byte code with the operating system details.
Source: CoolInterview.com

JVM is a software which takes .class file content and convert them machine language code. Source: CoolInterview.com

JVM is software which interprets the bytecode according to platform of that machine(on which this bytecode is to be execute) Source: CoolInterview.com

At the execution time java create on class file that is byte code. This byte code is run by JVM. JVM is a runtime environment.

All operating system has JVM. so only we say java is platform independent. Source: CoolInterview.com

JVM: As it name specifies, it is a virtual computer placed on top of your hardware and os. when ever a java application is called an jvm instance is created. The thread from os creates the jvm instance.
Inside the jvm the Class loadersubsystem loads your compiled javabyte code to the memory. The JVM creates the instance of your class object.the objectinstance is stored in the heap.The non-demon thread executes your methods inside your object instance and finally the non-demon thread is destoryed and the jvm instance is also ended. Source: CoolInterview.com

running a program means "tell the JVM to load the class and start and executing its main()
method."a class file gets created
which is converted into bytecodes by the jvm.this output is then interpreted by the processor to produce the desired output. Source: CoolInterview.com

JVM means Java Virtual Machine.. Java was an object oriented language, JVM it contains both compiler and interpreter other languages having only compiler or interpreter.. Source: CoolInterview.com

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