arithmetic promotion

[luk Hann]

Please clear my doubt why no need of an explicit casting at line 1:

public class Tester {
public static void main(String args[]) 
{
int i=0;
byte b=0;
b+=b-(i=10); //line 1
System.out.println(b);
}
}

Thanks.
luk

[Michael Burke]

When you use the += operator the compiler performs an implicit cast for you.