What is Boxing and Unboxing?
Answers were Sorted based on User's Feedback
Answer / kautilya
Boxing is to implicitly converting value type to refrence
type,
int x = 10;
double y = x;
Unboxing is to explicitly converting refrence type to value
type
double y = 10.234;
int x = (int)y;
Is This Answer Correct ? | 8 Yes | 1 No |
Answer / lakshmi
The conversion of the value type to reference type is known
as Boxing and converting reference type back to value type
is known as Unboxing.
Is This Answer Correct ? | 8 Yes | 1 No |
Answer / kumaresh
BOXING: Converting value type to referenc type.
Here we go with an example,
ArrayList instance = new ArrayList()
//In the above line of code,ArrayList is a reference
type.Add some items to the arraylist. For example,
instance.Add(1);
instance.Add(100);
instance.Add(3);
//3 items added to the arraylist.
//Integer valuee 3 is value type.Adding 3 to the reference
type(here it's arraylist) is boxing.
i.e., Converting value type to referenc type.
UNBOXING:Converting Reference type to value type.
Below is an example, retrives the items from the
arraylist.
foreach (int item in arrayList)
Console.WriteLine(item);
Here arraylist(referenec type) will have 3 values in the
list, which we added above.
Adding this arraylist items to an int variable[here int
variable is "item"] is unboxing.
i.e.,converting the reference type to value type.
Hope you would have understood.
Thanks
Is This Answer Correct ? | 5 Yes | 0 No |
Answer / eduardo belmonte
Boxing is the process of converting value type to reference
type.
Unboxing is the process of converting from a reference type
to a value type.
Both are slow and should be avoided when possible or
unneeded.
Dim st AS String
Dim obj As Object
Dim n As Integer = 5
st = n ' Boxing happens
obj = n ' Boxing happens
n = st ' Unboxing happens
n = obj ' Unboxing happens
Is This Answer Correct ? | 4 Yes | 1 No |
Answer / amit
The conversion of the value type to reference type is known
as Boxing and converting reference type back to value type
is known as Unboxing.
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / uma
Boxing means converting value type to refrence type and un
boxing means converting refrence type to value type
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / karthik
Boxing:Focing an value type into referencetype is known as boxing.
EX:int a=10;
object obj;
obj=a;
Unboxng:forcing an reference type into value type is known as unboxing.
EX:
int b:
b=(int)obj;
unboxing should be done explicitly using datatype casting.
Is This Answer Correct ? | 1 Yes | 0 No |
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