Java Learning: Operators and Precedence

Operator

• Separator: ,; [] ()
• Arithmetic operator: +-*/% + +--
• Relational operators: > < >= <= = = =!
• Logical operator: !　　& | ^ && | |
• Assignment operator: =
• Extended assignment Operator: + = = *=/=
• Trinocular operator: ?:
• String Join operator: +

The "+" and "-" operators can also be used as positive and negative symbols of the data.

&&: Short circuit and, as long as one of the expressions or methods has a value of false, the result is false and the subsequent operation is not performed.

|| : Short-circuiting or, as long as one of the expressions or methods has a value of true, the result is true and the subsequent operation is not performed.

 Short s = ten; // error, S is short,1 default to int, first convert right s to int and add, result int // s = s + 1;     // error s = (short) (s + 1);    // correct s + = 1;        // correct, equal to S = (short) (S + 1);

Three-mesh operators:

X? Y:z x is a Boolean type, and if X is true, the expression result is Y, otherwise Z

String connector: As long as "+" appears on either side of the string, "+" represents the string connector

• The operator "+" is used for numeric type data, which is an addition operator

Example: "Abd" + "de" Result: "ABCDE"

• Used for string Lee type, which is a connector
• string + numeric value, Java automatically converts the value to a string and then joins it into a new string

Example: "12" + 34 Result: "1234"

System.out.println (12+34+ "");    // " the" System.out.println ("+12+34");    // "1234"

Precedence of Operators

• In addition to the Monocular operator, assignment operator, and conditional operator, the other operators are combined from left to right.
• Operator Precedence formula: non-, count, close, and OR, assign
• The following table is priority order, high priority in upper, same row priority

Operator Precedence Upgrade

Operator description	Java operators
Separator	. []　　()　　,　　;
Monocular operator	+-~! + +--
Create or type conversions	New (Type)
Multiplication/Division	*　　/　　%
Addition/Subtraction	+
Relationship	< <= >= > instanceof
Equivalent	= = =
Bitwise-AND	&
Bitwise XOR OR	^
Bitwise OR	|
Conditions and	&&
Conditions or	||
Conditions	? :
Assign value	=

Java Learning: Operators and Precedence