Java Keywords and identifiers

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First, the key word

given the special meaning of the Java language, use it as a special-purpose string (word) Note: All letters in the keyword are lowercase

Abstract	Boolean	Break	Byte	Case
Catch	Char	Class	Const	Continue
Default	Do	Double	Else	Extends
Assert	Final	Finally	Float	For
Goto	If	Implements	Import	instanceof
Int	Interface	Long	Native	New
Strictfp	Package	Private	Protectde	Public
Return	Short	Static	Super	Switch
Synchronized	This	Throw	Shrows	Transient
Try	void	Volatile	While

java reserved word: The existing Java version is not yet used, but later versions may be used as keywords. Avoid using these reserved words when you name the tags yourself

Byvalue, cast, future, generic, inner, operator, outer, rest, VAR, goto, const

Second, identifiers

The sequence of characters used by Java to name features such as variables, methods, and classes is called identifiers.

To define a legal identifier rule:

• Made up of 26 letters in uppercase, 0-9, _ or $
• Numbers may not start.
• You cannot use keywords and reserved words, but you can include keywords and reserved words.
• Java is strictly case-sensitive and has unlimited length.
• Identifiers cannot contain spaces.

Java Keywords and identifiers