java--Basic Syntax

Grammar	Description
Comments
//	Single-line Comment
/*...*/	Multi-line comments
/**...*/	Document comments
Separator
;	Each Java statement must end with A;
{}	Define a block of code
[]	Used to access array elements 0-n
()	Method definition, method invocation, operator
.	Delimiter between a class/object and its members
Identifier
	Consists of letters, underscores (_), dollar characters ($), numbers, where numbers do not begin
Java keywords
Abstract	Abstract
Assert
Boolean	Boolean (can only be true or FALSE, other data types cannot be converted to Boolean types)
Break	End Loop, etc.
Byte	Integral type (1 bytes)
Case	Branch statements
Catch
Char	Character type (2) "
Class	Class
Const	Reserved words
Continue	End this cycle
Default	Default (interface default class definition)
Do	Looping statements
Double	Floating-point (8)
Else	Judgment statement
Enum	Enumeration
Extends	A successor B (class A extends B)
Final
Finally
Float	Floating-point (4) is defined with a number followed by F to indicate
For	Looping statements
If	Judgment statement
Goto	Reserved words
Implements	Implementing interfaces
Import	Classes for importing Packages
instanceof	(operator) to determine if the conversion can be successful
Int	Integral type (4)
Interface	Defining interfaces
Long	Integer (8) is defined by the number followed by the L to indicate
Native	Similar to an abstract approach, the difference is that the native method is usually implemented in C (will lose cross-platform functionality)
New	Call constructor
Package	Create package (first line)
Private	Private
Protected
Public	Total
Return	End method
Short	Integral type (2)
Static	Static (class member)
Strictfp	Make floating-point calculations more precise within the cosmetic range
Super	Call the parent class overridden instance method | variable
Switch	Branch statements
Synchronized
This	Invokes the member of the current class (non-static adornment)
Throw
Throws
Transient
Try
void	No return value
Volatile
While	Looping statements
Automatic type conversion
BYTE---------long------double
CHAR-to-int
Forcing type conversions
(targetType) value	Force the conversion of value to the TargetType type
Expression type auto-promotion
	All byte, short, char type will be promoted to int type
	The entire arithmetic expression data type is automatically promoted to the same type as the highest-level operand in the expression
	Two integers, even if not done, will get an integral type
Trinocular operator
	(expression)? If-true-statement:if-false-statement

java--Basic Syntax