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;//compilation error
    }
}

Why 20 is automatically type-casted to byte while x not?

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.