问题描述
Java中>>>和>>运算符有什么区别?
What is the difference between >>> and >> operators in Java?
推荐答案
>> 是算术右移，>>>> 是逻辑右移.
>> is arithmetic shift right, >>> is logical shift right.
在算术移位中，符号位被扩展以保持数字的符号性.
In an arithmetic shift, the sign bit is extended to preserve the signedness of the number.
例如:以 8 位表示的 -2 将是 11111110(因为最高有效位具有负权重).使用算术移位将其右移一位将为您提供 11111111 或 -1.然而，逻辑右移并不关心该值是否可能代表一个有符号数；它只是将所有内容向右移动并从左侧填充 0.使用逻辑移位将我们的 -2 右移一位将得到 01111111.
For example: -2 represented in 8 bits would be 11111110 (because the most significant bit has negative weight). Shifting it right one bit using arithmetic shift would give you 11111111, or -1. Logical right shift, however, does not care that the value could possibly represent a signed number; it simply moves everything to the right and fills in from the left with 0s. Shifting our -2 right one bit using logical shift would give 01111111.
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