What is the number of memory types allocated by JVM?
Native Method Stack
Program Counter Register
What is platform?
system is generally the components or application atmosphere in which
a program operates. There are two types of system software-based and
hardware-based Java provides software-based system.
What gives Java its ‘write once and run anywhere’ nature?
bytecode Java is collected to be a byte program code which is the
advanced language between source program code and device program
code. This byte program code is not system particular and hence can
be fed to any system.
What is JIT compiler?
compiler: It is used to boost the efficiency. JIT gathers areas of
the byte program code that have similar efficiency at once, and hence
cuts down the amount of time required for collection. Here the term
represents an interpretator from the instruction set of a Java
Virtual Machine (JVM) to the training set of a particular CPU.
What is classloader?
classloader is a subsystem of JVM that is used to fill sessions and
connections.There are various kinds of classloaders e.g. Bootstrap
classloader, Expansion classloader, Program classloader, Plug-in
is the distinction between JDK, JRE and JVM?
stands for Java Runtime Environment and it is one of the procedure of
stands for Java
and the execution of Java byte code which is aided by the abstract
machine by providing the runtime environment.
stands for Java Development Kit and it is existing physically and it
consists of JRE + development tools.
Is next, delete, exit, main or null keyword in Java?
Will the String array of Main method is empty or null; if any
arguments are not provided on the command line?
is empty, but not null.
What is difference between object oriented development language and
object focused development language?
focused development different languages follow all the features of
OOPs except Bequest. Examples of object oriented development
What is constructor?
is just like an approach that is used to initialize situations of a
product. It is invoked at the time of object development.
Does constructor come back any value?
that is present example (You cannot use return type yet it gives a
Is constructor inherited?
constructor is not inherited
Can you make a constructor final?
constructor cannot be final
What is static variable?
is used to relate the typical residence of all things (that is not
exclusive for each object) e.g. company name of workers,college name
of scholars etc.
gets storage only once in education area at the time of
Why main method is static?
it is not required for the object to instantiate a static method and
if it was non static method, object is first created by jvm and then
it calls the main function and it will lead to the problem of extra
allocation of memory.
What is static block?
data member is initialized using this.
the time of classloading it was executed before main method.
What is the goal of a default constructor?
standard constructor provides the standard principles to the things.
a standard constructor only if there is no constructor in the class
Can we perform a system without main() method?
one of the way is static block
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