Yes
, we change the state of an object to which a final reference variable is pointing but we cannot re-assign a new object to this final reference variable.
Can reference variable be changed?
You cannot reassign a reference. Formally speaking, that is impossible as it is forbidden by design. Arbitrarily speaking, that is possible. A references is stored as a pointer, so
you can always change where it points to as long as you know how to get its address
.
Can a final variable be changed?
The value of
a final variable cannot be changed once it is initialized
. A final variable is different from a constant as the value of a final variable is not necessarily known at compile time. A final variable can only be initialized once, either via an initializer or an assignment statement.
What if the reference variable is marked as final?
When we use the final keyword with reference variable it means
we can’t reassign it to another reference or object
. But you can change the value of members by using the setter methods. When we create a reference variable with final keyword it means we can’t use the “=” operator to reassign it.
Can a reference be modified?
The data with in object can be modified but the reference variable cannot be changed. …
Does reference variable change the original value of variable?
While this may not sound appealing at first, what this means is that when you declare a reference and assign it a variable, it will allow you to treat the reference exactly as though it were
the original variable
for the purpose of accessing and modifying the value of the original variable–even if the second name (the …
Can we declare a reference variable without initializing it?
A reference can be declared without an initializer: When it is used in
a parameter declaration
. In the declaration of a return type for a function call.
Can a static final variable be changed?
A static variable is common for all instances of the class.
A final variable can not change after it has been set the first time
. So a static final variable in Java is common for all instances of the class, and it can not be changed after it has been set the first time.
Can you override a final method?
Can We Override a Final Method? No,
the Methods that are declared as final cannot be Overridden or hidden
. … Methods are declared final in java to prevent subclasses from Overriding them and changing their behavior, the reason this works is discussed at the end of this article.
What’s a final variable?
Once a final variable has been assigned,
it always contains the same value
. … If a final variable holds a reference to an object, then the state of the object may be changed by operations on the object, but the variable will always refer to the same object (this property of final is called non-transitivity).
Can we initialize final variable in constructor?
A
blank final variable can be initialized inside instance-initializer block or inside constructor
. If you have more than one constructor in your class then it must be initialized in all of them, otherwise compile time error will be thrown.
What is difference between immutable and final?
final means that you can’t change the object’s reference to point to another reference or another object, but you can still mutate its state (using setter methods e.g). Whereas immutable means
that the object’s actual value can’t be changed
, but you can change its reference to another one.
Can we declare constructor as final?
No Constructors can NEVER be declared as final
. Your compiler will always give an error of the type “modifier final not allowed” Final, when applied to methods, means that the method cannot be overridden in a subclass.
Why array of reference is not possible?
An array of references is
illegal because a reference is not an object
. According to the C++ standard, an object is a region of storage, and it is not specified if a reference needs storage (Standard §11.3. 2/4). Thus, sizeof does not return the size of a reference, but the size of the referred object.
Why reference is not same as a pointer?
Why reference is not same as a pointer?
A reference can never be null
. A reference once established cannot be changed. Reference doesn’t need an explicit dereferencing mechanism.
What is the difference between pointer and reference?
Pointers: A pointer is a variable that holds memory address of another variable. … References : A reference variable is an alias, that is, another name for an already existing variable. A reference, like a pointer, is also implemented by storing the address of an object.
