Add two bytes together and you'll get an int. : Integer « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Integer

Multiply an int and a short and you'll get an int. 
Divide a short by a byte and you'll get an int. 

public class MainClass{
    public static void main(String[] argv){

        byte a = 3;     // 3 fits in a byte
        byte b = 8;     // 8 fits in a byte
        byte c = b + c; // 11 fits in a byte.  Type mismatch: cannot convert from int to byte
        c = (byte) (a + b);

        System.out.println();
    }
}