Java移位运算，别让二进制把你玩得团团转-北京尧图网络

JAVA 位运算详解前言利用java进行位运算, 能够高效地完成数值计算, 这是由于机器自身是基于二进制来进行存储与计算的, 所有的数值或者对象, 最终都需要转化为二进制。一、JAVA里支持的位运算符, 位与, 它是二元运算符, 当两个都为1的时候结果才是1 , 位或|, 这是二元运算符, 只要两个当中有一个为1 , 不然结果就是0 , 位异或^, 此为二元运算符, 当两个数同为1或者0的时候结果是1 , 不然就是0 , 位取非~, 这是一元运算符, 进行取反操作 , 左移, 它是一元运算符, 是按照右移确定的位置 , 高位补上符号位 , 符号位保持不变 , 低位出现溢出。无符号右移, 它是一元运算符, 其符号位也就是最高位会被保留, 其他位置会向右移动, 高位补零, 低位溢出, 二.位运算规则。在Java数值进行运算期间, 皆是先把十进制转化成二进制, 接着去进行运算, 随后又将二进制数据转变为十进制并呈现给用户, 二进制运算规则如下:对于有符号的而言处于最高位置的是符号位, 若此符号位为0, 那么代表着的是正数, 要是为1, 则表示的是负数, 正数的原码、反码以及补码这三者是相同的, 呈现出三码合一的状态, 负数的反码是这样规定的, 符号位维持不变, 其余各位都要取反, 负数的补码同样如此, 符号位保持不动, 其他各位取反, 负数的补码还有另外一种情况, 是补码加上1得到的, 0的反码以及补码都是0, 当计算机进行运算之时, 全部都是把原码转化成为补码之后才开展运算工作的, 接下来以 -1 作为示例来展现原码、反码以及补码的转换关系以int数据类型举例子哦, int类型在Java里占据4字节:三、与运算属于逻辑运算, 其存在着运算规则, 即针对两个数处于相同位置的那些比特去施行与运算, 假定两个位置之处都为1的话, 那么最终结果便确定为1了, 不然结果就为0。运算流程以 4 -5 0 为例子展示运算流程因为4为整数所以原码和补码相同即4的补码为 0因其 -5 属于负数范畴, 故而要开展原码向反码再到补码的转变操作。1. ) 原码102. ) 反码113. ) 补码11去把4以及负5的补码拿来做运算, 0去和11去做运算, 结果等于0。得到的补码结果为0 转化为十进制即为 02.或运算| 运算规则就两个数而言, 处于相同位置上的比特, 去开展或运算时, 要是其中存在一个是1的情况, 那么其结果便是1 , 不然的话, 结果就是0。运算流程从 -2 | 5 -1 处展现出算程经过有: 以, -2身为负的数,得对原码给以转变至反码, 而后依次从反码再转变到补码。转化步骤是这样的, 原码是10 , 反码是符号位保持不变其余位置进行取反操作后得到11 , 补码是在反码的基础上加上1得到11 吗, 5是为正数, 5的补码以及反码是相同的, 那么5的补码是00 , 要把 - -2和5的补码就行或运算, 也就是11和00 的或预算, 结果是11 , 依据上面的运算得出补码的结果是11 , 这个结果明显是一个负数, 而负数补码和原码是不一样的, 所以得将补码的结果转变成原码方能得到最终的结果, 补码转原码的过程跟原码转补码相比是相反的过程, 具体的过程如下:1补码112补码-1 得到反码113原码, 其符号位保持不变, 而其他位置进行取反操作后得到: 10, 最终所得到的原码结果即为10, 并将其转成十进制后为 -1, 3上要有异或运算^, 其运算规则。先谈两个数, 要在相同位置做或运算, 要是这两个数都是0或者都是1, 那么结果就是0, 不然结果就是1。运算流程以 1^ -5 6 为例具体运算流程如下1 1 的原码补码反码为 002 -5属于负数范畴, 得开展原码大于反码大于补码的转换工作。其转换流程如下所述:原码 10反码11将两个补码进行运算, 其中一个补码是11, 另一个补码是00, 运算过程为00 ^ 11 , 得到的补码结果是11, 此补码为负数, 需转换为原码。1 补码112 反码113原码 10由原码10000000 00000000 00000000 000000110得出最终的时间结果为 -64 取反运算 ~ 运算规则若位数为0则取反后为1如为1 取反后为 0运算流程以 ~2 -3 为例运算流程如下12 的原码补码反码为 002~ 取反 1113取反后结果乃未补码此时补码为负数则需要转成原码4111 取反码为 1115原码符号位补变其他位置取反得到原码为106 把-34位移操作右移(), 其结果是10转换为十进制后的结果。规则是, 符号位置保持不变, 处于低位的进行溢出截断, 处于高位的则用符号位加以填充, 就像8右移2相当于2。无符号右移规则高位填充0低位溢出。如 -1 1 左移 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