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data type of results of java arithmetic calculation

 
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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.
 
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The JLS is the most authoritative source on the issue of type conversions in Java.

Java itself does not check integer arithmetic overflows, but I've found this interesting tool which does so.
 
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