Java - Explicit Conversion from Int to Short

java variables casting int short
Octocat picture Octocat · Sep 18, 2013 · Viewed 58.5k times · Source

Can someone please explain why this following statement:

short value = (short) 100000000;
System.out.println(value);

Gives me:

-7936

Knowing that the maximum value of a short in Java is 32767 correct?

Answer

rgettman picture rgettman · Sep 18, 2013

With your value of 100 million, I get -7936. I can only get 16960 if I change 100 million to 1 million.

The reason is that short values are limited to -32768 to +32767, and Java only keeps the least significant 16 bits when casting to a short (a narrowing primitive conversion, JLS 5.1.3). Effectively this operation: 1 million mod 2^16 (16 bits in a short) is 16960.

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