what is the difference between a java object reference and
c++ pointer?
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Answer Posted / aruna
object reference contains the address of the newly created
object by the JVM.
object reference is also a variable (variables are seen as
memory cells that can be accessed using their identifiers.
This way we did not have to care about the physical
location of our data within memory, we simply used its
identifier whenever we wanted to refer to our variable.)
using which we can access an object without knowing the
actual address or the location in which it is stored.
So,creating an object means, allocating some memory in heap
and intialise the instance variables and return the address
of the newly created object to the program.
thus, object reference contains the address of the memory
location(where the object is stored to which it is pointing
to)
JVM keeps track of these references.
In C++:
& is the reference operator and can be read as "address of"
* is the dereference operator and can be read as "value
pointed by".
For ex:
a= *c; // *(&b)
c= &b; // address of b (120) is stored in c.
where b=1000 and its stored in the memory location 120.
then the output of above two statements is:
a=1000;
c=120;
So, C++ pointer is nothing but a memory location in which
the value of the actual object it is pointing to is stored.
difference btn C++ pointer and object reference in java.
1. C++ pointer can point to any primitive data type where
as object reference in java point to an object.
Note:
whatever language you use, basic definitions would not
change.
| Is This Answer Correct ? | 6 Yes | 1 No |
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