int用两个最重要的字节来缩短

Question

我有一个整数

int a = //...

intjava中的s由4个字节组成.如果我们将其转换为short,我们将采用两个最不重要的字节.什么是最快的方法来short组成2个最重要byte的int？

short b = //take two most significant bytes of a

Answer 1

short b = (short) (a >> 16);