Java Basics, etc.

One, Java code comment

A single line of comments (//..... ...). ....... ）

Multiline Comment (/*...................*/)

Document Comments (/**..............................*/

Single-line comment shortcut key ctrl+/

Second, operator

Unary operators

Binary operators

Ternary operators

Arithmetic operators

logical operators

Bitwise operators

Other operators

Arithmetic operators: + 、-、 *,/,% (take more)

Concatenation operator: + (String type)

Conversion operators

Gaga and decrement operators: + + 、--

Logical operator:! , &&, | |, = =, <, >, etc.

Trinocular operator: Code 1? Code Listing 2: Code 3

Displacement operator

Expression: A meaningful code consisting of at least one operand and at least one operator.

Characteristics of expressions: each expression has a return type

Each expression can be operated with other expressions as long as the type meets the requirements.

Precedence of operators:

Common scenarios for expression of multiple operators

1. Operation from left to right

2, the assignment of the expression, always in the last step

3, if there is a function call, the first function call, if the function call is a type conversion, then perform type conversion

4. Mathematical Operation rules

Java Basics, etc.