Java: double to int automatic conversion

int i = 1;
i = i + 1.2; 

would result in compile time error. I understand that i + 1.2 would result in a float which can't be assigned to integer.

This code is error free and the result is an integer.

int i = 1;
i += 1.2; 

This automatic narrowing is mind boggling.

Edit:
Had been searching for answer the whole day and someone finally answered it.

A compound assignment expression of the form E1 op= E2 is equivalent to E1 = (T)((E1) op (E2)), where T is the type of E1, except that E1 is evaluated only once.
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