• 【Java SE]位运算和移位运算需要知道的重点

    目录

    1.位运算

    1.1按位与 &:

    如果两个二进制位都是 1, 则结果为 1, 否则结果为 0

    1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
    2.     public static void main(String[] args) {
    3.         int a=10;
    4.         int b=1;
    5.         int c=a&b;
    6.         System.out.println(c);
    7.     }
    8. }

    • 1.2按位或 |:

    如果两个二进制位都是 0, 则结果为 0, 否则结果为 1

    1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
    2.     public static void main(String[] args) {
    3.         int a=10;
    4.         int b=1;
    5.         int c=a|b;
    6.         System.out.println(c);
    7.     }
    8.  
    9. }

1.3按位取反 ~:

如果该位为 0 则转为 1, 如果该位为 1 则转为 0

  1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
  2.     public static void main(String[] args) {
  3.  
  4.         int a=10;
  5.          a=~a;
  6.         System.out.println(a);
  7.     }
  8.  
  9. }

1.4按位异或 ^:

如果两个数字的二进制位相同, 则结果为 0, 相异则结果为 1

  1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
  2.  
  3.     public static void main(String[] args) {
  4.         int a=10;
  5.         int b=1;
  6.         int c=a^b;
  7.         System.out.println(c);
  8.     }
  9.  
  10. }

2.移位运算

2.1 左移 <<:

最左侧位不要了, 最右侧补 0

  1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
  2.  
  3.     public static void main(String[] args) {
  4.         int a=10;
  5.         int b=a<<1;
  6.         System.out.println(b);
  7.  
  8.     }
  9.  
  10. }

2.2右移 >>:

最右侧位不要了, 最左侧补符号位(正数补0, 负数补1)

  1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
  2.     public static void main(String[] args) {
  3.         int a=10;
  4.         int b=a>>1;
  5.         System.out.println(b);
  6.     }
  7.  
  8. }

2.3无符号右移 >>>:

最右侧位不要了, 最左侧补 0.

  1. class="prettyprint hljs cs" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; overflow-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public class Test {
  2.     public static void main(String[] args) {
  3.         System.out.println(1>>>1);
  4.         System.out.println(-1>>>1);
  5.     }
  6.  
  7. }

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  • 原文地址：https://blog.csdn.net/weixin_62421895/article/details/126033123