// C++ int a = 1; cout << (a<<38);
你得到0.但是,在Java中,你实际上会循环并获得64的有效值.
我需要将一些C代码翻译成Java,所以我用什么作为<<？
解决方法
If the promoted type of the left-hand operand is int,only the five
lowest-order bits of the right-hand operand are used as the shift
distance. It is as if the right-hand operand were subjected to a
bitwise logical AND operator & (§15.22.1) with the mask value 0x1f
(0b11111). The shift distance actually used is therefore always in the
range 0 to 31,inclusive.If the promoted type of the left-hand operand is long,then only the
six lowest-order bits of the right-hand operand are used as the shift
distance. It is as if the right-hand operand were subjected to a
bitwise logical AND operator & (§15.22.1) with the mask value 0x3f
(0b111111). The shift distance actually used is therefore always in
the range 0 to 63,inclusive.
所以,在你的例子中,(int)(((long)a)<< 38)应该工作.
