算数运算符
算术运算符用在数学表达式中,它们的作用和在数学中的作用一样。下表列出了所有的算术运算符。
表格中的实例假设整数变量A的值为10,变量B的值为20:
操作符 | 描述 |
---|---|
+ | 加法 - 相加运算符两侧的值 |
- | 减法 - 左操作数减去右操作数 |
* | 乘法 - 相乘操作符两侧的值 |
/ | 除法 - 左操作数除以右操作数 |
% | 取余 - 左操作数除以右操作数的余数 |
++ | 自增: 操作数的值增加1 |
- - | 自减: 操作数的值减少1 |
例子
- public static void main(String[] args) {
- int a = 10;
- int b = 20;
- int c = 25;
- int d = 25;
- System.out.println("a + b = " + (a + b) );
- System.out.println("a - b = " + (a - b) );
- System.out.println("a * b = " + (a * b) );
- System.out.println("b / a = " + (b / a) );
- System.out.println("b % a = " + (b % a) );
- System.out.println("c % a = " + (c % a) );
- System.out.println("a++ = " + (a++) );
- System.out.println("a-- = " + (a--) );
- // 查看 d++ 与 ++d 的不同
- System.out.println("d++ = " + (d++) );
- System.out.println("++d = " + (++d) );
- }
- 运行结果
- "C:\Program Files\Java\jdk1.8.0_192\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.1.3\lib\idea_rt.jar=51196:C:\Program Files\JetBrains\IntelliJ IDEA 2020.1.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_192\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\rt.jar;D:\JavaProject\20210402\out\production\20210402" Test
- a + b = 30
- a - b = -10
- a * b = 200
- b / a = 2
- b % a = 0
- c % a = 5
- a++ = 10
- a-- = 11
- d++ = 25
- ++d = 27
- Process finished with exit code 0
关系运算符
运算符 | 描述 |
---|---|
== | 检查如果两个操作数的值是否相等,如果相等则条件为真。 |
!= | 检查如果两个操作数的值是否相等,如果值不相等则条件为真。 |
> | 检查左操作数的值是否大于右操作数的值,如果是那么条件为真。 |
< | 检查左操作数的值是否小于右操作数的值,如果是那么条件为真 |
>= | 检查左操作数的值是否大于或等于右操作数的值,如果是那么条件为真。 |
<= | 检查左操作数的值是否小于或等于右操作数的值,如果是那么条件为真。 |
例子
- public static void main(String[] args) {
- int a = 10;
- int b = 20;
- System.out.println("a == b = " + (a == b) );
- System.out.println("a != b = " + (a != b) );
- System.out.println("a > b = " + (a > b) );
- System.out.println("a < b = " + (a < b) );
- System.out.println("b >= a = " + (b >= a) );
- System.out.println("b <= a = " + (b <= a) );
- }
- 运行结果
- "C:\Program Files\Java\jdk1.8.0_192\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.1.3\lib\idea_rt.jar=51452:C:\Program Files\JetBrains\IntelliJ IDEA 2020.1.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_192\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_192\jre\lib\rt.jar;D:\JavaProject\20210402\out\production\20210402" Test
- a == b = false
- a != b = true
- a > b = false
- a < b = true
- b >= a = true
- b <= a = false
- Process finished with exit code 0
逻辑运算符
操作符 | 描述 |
---|---|
&& | 称为逻辑与运算符。当且仅当两个操作数都为真,条件才为真。 |
ll | 称为逻辑或操作符。如果任何两个操作数任何一个为真,条件为真。 |
! | 称为逻辑非运算符。用来反转操作数的逻辑状态。如果条件为true,则逻辑非运算符将得到false |
例子
- public static void main(String[] args) {
- boolean a = true;
- boolean b = false;
- System.out.println("a && b = " + (a&&b));
- System.out.println("a || b = " + (a||b) );
- System.out.println("!(a && b) = " + !(a && b));
- }
赋值运算符
赋值运算符 | 描述 | 例子 |
---|---|---|
= | 简单的赋值运算符,将右操作数的值赋给左侧操作数 | C = A + B将把A + B得到的值赋给C |
+ = | 加和赋值操作符,它把左操作数和右操作数相加赋值给左操作数 | C + = A等价于C = C + A |
- = | 减和赋值操作符,它把左操作数和右操作数相减赋值给左操作数 | C - = A等价于C = C - A |
* = | 乘和赋值操作符,它把左操作数和右操作数相乘赋值给左操作数 | C * = A等价于C = C * A |
/ = | 除和赋值操作符,它把左操作数和右操作数相除赋值给左操作数 | C / = A,C 与 A 同类型时等价于 C = C / A |
(%)= | 取模和赋值操作符,它把左操作数和右操作数取模后赋值给左操作数 | C%= A等价于C = C%A |
<< = | 左移位赋值运算符 | C << = 2等价于C = C << 2 |
>> = | 右移位赋值运算符 | C >> = 2等价于C = C >> 2 |
&= | 按位与赋值运算符 | C&= 2等价于C = C&2 |
^ = | 按位异或赋值操作符 | C ^ = 2等价于C = C ^ 2 |
l= | 按位或赋值操作符 | C l = 2等价于C = C |
- public static void main(String[] args) {
- int a = 10;
- int b = 20;
- int c = 0;
- c = a + b;
- System.out.println("c = a + b = " + c );
- c += a ;
- System.out.println("c += a = " + c );
- c -= a ;
- System.out.println("c -= a = " + c );
- c *= a ;
- System.out.println("c *= a = " + c );
- a = 10;
- c = 15;
- c /= a ;
- System.out.println("c /= a = " + c );
- a = 10;
- c = 15;
- c %= a ;
- System.out.println("c %= a = " + c );
- c <<= 2 ;
- System.out.println("c <<= 2 = " + c );
- c >>= 2 ;
- System.out.println("c >>= 2 = " + c );
- c >>= 2 ;
- System.out.println("c >>= 2 = " + c );
- c &= a ;
- System.out.println("c &= a = " + c );
- c ^= a ;
- System.out.println("c ^= a = " + c );
- c |= a ;
- System.out.println("c |= a = " + c );
- }
- 运行结果为:
- c = a + b = 30
- c += a = 40
- c -= a = 30
- c *= a = 300
- c /= a = 1
- c %= a = 5
- c <<= 2 = 20
- c >>= 2 = 5
- c >>= 2 = 1
- c &= a = 0
- c ^= a = 10
- c |= a = 10
- Process finished with exit code 0
Java运算符优先级
类别 | 操作 | 关联性 |
---|---|---|
后缀 | () [] . (点操作符) | 左到右 |
一元 | expr++ expr– | 从左到右 |
一元 | ++expr --expr + - ~ ! | 从右到左 |
乘性 | * /% | 左到右 |
加性 | + - | 左到右 |
移位 | >> >>> << | 左到右 |
关系 | > >= < <= | 左到右 |
相等 | == != | 左到右 |
按位与 | & | 左到右 |
按位异或 | ^ | 左到右 |
按位或 | l | 左到右 |
逻辑与 | && | 左到右 |
逻辑或 | ll | 左到右 |
条件 | ?: | 从右到左 |
赋值 | = + = - = * = / =%= >> = << =&= ^ = l= | 从右到左 |
逗号 | , | 左到右 |
总结
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原文链接:https://blog.csdn.net/qq_45859087/article/details/115399589