[Java02] Operator

[Java02] Operator
Arithmetic Operators

Java uses four types of operations: +,-, *, And/, indicating addition, subtraction, multiplication, and division. % indicates the remainder operation. If the two numbers involved in the operation are integers, the integer division is used. Otherwise, the floating point division is used. 15/7 = 2.0% 2 = 7.5/=.
Simplified Binary Arithmetic Operator number:

+ =
X + = 4, equivalent to x = x + 4-=
X-= 4 is equivalent to x = X-4 * =
X * = 2 is equivalent to x = x * 2/=
X/= 2 is equivalent to x = x/2. Auto-increment and auto-increment Operators

Prefix auto-increment: ++ n
Suffix auto-increment: n ++

int a=6;int b=6;int m=++a //m=7,a=7int n=b++ // n=b,b=7

During prefix operations, n is first added with 1 before the operation. During suffix operations, n is first computed with 1 after the operation.

Relational operators

Operator	Function
=	Checks whether values of equal signs are equal.
! =	Checks whether the values on both sides of the equal sign are not equal.
>	Greater
<	Less
> =	Greater than or equal
<=	Less than or equal

Logical operators

& Indicates logic and. If A & B is true only when A and B are true, A | B. If either A or B is true, A | B is true. & | calculate the value based on the short-circuit mode. If the first operand can determine the result of the expression, the second operand is no longer calculated.

x!=0 && 1/x>x+y

Bitwise operators

Four bitwise operators:

&
Take 29 as an example. The binary value of 29 is (11101), the binary value of 16 is (10000), and the result of 29 & 16 is 16 (1 0000)

  System.out.println(29&16);  //16

| Or ^ exclusive or ~ Non <left shift
Move left is similar to move the decimal point. move the decimal point to the left by 10 times, and move the decimal point to the left by 2 times in the computer. Shift n places to the left to enlarge the n power of 2.> shift right
The right shift is the opposite of the Left shift.

int a=16;System.out.println(a>>2); //a=4System.out.println(a<<2); //a=64