In

java, I know the data type of the result of an arithmetic calculation depends on the data types of the numbers involved in the calculation. For example,

int + int = int

long/double=double

a. But I can't find any references which can give me all these rules. Could someone help me?

b. How to avoid over flow in arithmetic calculation? For example, the results of 2 long may not fit into a long anymore...

Thanks a lot.