Core java interview Questions You'll Most Likely Be Asked (Second Edition)

How will you cast an int variable to byte explicitly? Is it
really necessary to cast int literal to byte?
Answer:
An int variable can be cast to byte as follows:
int i = 30;

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023.
024.
byte bValue = (byte)i;
So, you need to specify the “byte” keyword before the int
variable. Yes, it is necessary to cast an int variable to byte
explicitly, otherwise a compilation error will occur as below:
byte bValue = i; //compilation error
This is because int is a wider type as compared to byte. So, Java
cannot automatically convert the int type to byte, you need to
specify an explicit cast.
Give an example of implicit casting.
Answer:
Implicit casting occurs when a value is assigned to a variable of a
wider data type. In such cases, the conversion happens by
default and there is no need of an explicit cast. For example, if
you assign an int value to a long value, an implicit cast will occur.
The following code snippet demonstrates this:
int iValue = 250;
long lValue = iValue;
The above code demonstrates that an int value can always be
assigned to a long variable without casting and the conversion
happens by default.
Write a code snippet that demonstrate how you can
assign a float value to a short variable.
Answer:
The following code demonstrates converting a float value to a
short variable:

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025.
026.
float fValue = 37000.02F;
short sValue = (short) fValue;
Here, the keyword short is specified before the float variable
fValue, this is known as explicit cast. Since float is a wider data
type than short, an explicit cast is required.