Operator of Java Syntax basics

An operator is a special symbol that represents the operation, assignment, and comparison of data. Operators are divided into arithmetic operators, assignment operators, comparison operators, logical operators, and shift operators.

First, arithmetic operators

The function of arithmetic operators is to do various arithmetic operations, whose operands can be character, integer, or float data. The arithmetic operators in Java can be divided into two types: the monocular operator and the binocular operator. The monocular operator has only one operand, and only the only operand is processed. There are two operands of binocular operators, which are performed by two operands during operation. The arithmetic operators are shown in the following table:

Operator	Operation	Example	Results	Type
+	Positive sign	+3	3	Monocular operator
-	Minus sign	B=4;-b;	-4	Monocular operator
+	Add	5 + 5	10	Binocular operator
-	Reducing	6-4	2	Binocular operator
*	By	2 * 2	4	Binocular operator
/	Except	5/5	1	Binocular operator
%	Take the mold	5% 3	2	Binocular operator
++	Self-increment (ex)	A = 2; b = ++a;	A = 3; b = 3	Monocular operator
++	Self-increment (rear)	A = 2; b = a++;	A = 3; b = 2	Monocular operator
--	Self-reduction (ex)	A = 2; b =--a;	A = 1; b = 1	Monocular operator
--	Self-reduction (rear)	A = 2; b = a--;	A = 1; b = 2	Monocular operator
+	string addition	"Hel" + "Lo"	"Hello"	Binocular operator

Note: The difference between the self-increment and the self-subtraction position.

Second, assignment operator

The function of an assignment operator is to assign a value to another variable, and the most commonly used assignment operator is "=", and the left side of the assignment operator must be a variable, not a value. The assignment operators are shown in the following table:

Operator	Operation	Example	Results
=	Assign value	A = 3; b = 2;	A = 3; b = 2;
+=	Plus equals	A = 3; b = 2; A + = B;	A = 5; b = 2;
-=	Minus equals	A = 3; b = 2; A-= b;	A = 1; b = 2;
*=	Multiply equals	A = 3; b = 2; a *= b;	A = 6; b = 2;
/=	except equal to	A = 3; b = 2; a/= b;	A = 1; b = 2;
%=	Touch equals	A = 3; b = 2; a%= b;	A = 1; b = 2;

Third, relational operators

The relational operator is used to compare two values, which is the binocular operator, and the result of the operation is a Boolean type. The relational operators are shown in the following table:

Operator	Operation	Example	Results
==	Equivalent to	4 = = 3	False
!=	Not equal to	4! = 3	True
<	Less than	4 < 3	False
>	Greater than	4 > 3	True
<=	Less than or equal	4 <= 3	False
>=	Greater than or equal	4 >= 3	True
instanceof	Check if the object is a class	"A" instanceof String	True

Four, logical operators

A logical operator is used to perform an operation on an expression of the result of a Boolean type, and the result of the operation is Boolean.

Operator	Operation	Example	Results
&	And	False & True	False
|	Or	False | True	True
^	XOR or	True ^ false	True
!	Non -	! True	False
&&	And	False && True	False
||	Or	False | | True	True

Note that the difference between:& and && is that if you use the former connection, the expressions on both sides of the,& will participate in the operation. If you use the latter connection, when the && left is false, the right side will not participate in the operation. In the same vein | | |

Five, bitwise operators

The data is encoded in binary storage inside the computer, and Java allows bitwise operations on these binaries. The bitwise operators are shown in the following table:

Bitwise operators	Operation	Example	Function description
&	And	X & Y	Bitwise AND Operation
|	Or	x | Y	Bitwise OR operation
^	XOR or	x ^ y	Bitwise XOR Operation
!	Non -	!x	Bitwise non-arithmetic
>>	Move right	X >> y	Shifts the binary encoding of x to the right Y-bit, and the preceding bits are filled by the symbol
<<	Move left	X << y	Shift the binary encoding of x to the left Y bit, and the low 0
>>>	Unsigned Right Shift	X >>> y	Shifts the binary encoding of x to the right Y-bit, and the preceding bit is filled by 0

Vi. Other operators

• Trinocular operator: The general form is:< logical expression 1>? < expression 2>: < expression 3>

• (): Used to force type conversions, method calls.

• []: Declares, creates an array, and accesses specific elements in the data.

• NEW: Creates an object, an array.

• .: Access class member variables, object member variables.

Seven, operator precedence

Operator	Priority level
() []	High
++ -- ~ !
* / %
+ -
>> >>> <<
> >= < <=
== !=
&
^
|
&&
||
?:
= + = = *=/= &= |= ^= <<= >>= >>>=	Low

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Operator of Java Syntax basics