type casting of byte and int

Question

I\'d a code snippet:

class AutoTypeCast{
    public static void main(String...args){
        int x=10;
        byte b=20;//no compilation error
        byte c=x;         


        

Answer 1

Because x is an int and has a wider range as byte. That is why there may be data loss is you assign it to byte.

20 is a constant and while compile time garanteed to be in the range of byte.

Answer 2

Up-casting is automatic where as down-casting or narrowing (byte c=x;) should be explicit as it might cause loss of precision which a programmer should be aware of explicitly. To correct it you need to put an explicit cast byte c=(byte)x;