1-keyword identifier comment

keywords: Words that are given a specific meaning by the Java language,the letters that make up the keywords are all lowercase,Goto and const exist as reserved words and are not currently used

Identifier

L Identifier: a sequence of characters to use when naming classes, interfaces, methods, variables, etc.

L Composition Rules

• English uppercase and lowercase letters

• Numeric characters

$ and _

L Precautions

• Cannot start with a number

• Cannot be a keyword in Java

• Case sensitivity

Identifiers (common naming rules)

Comment Classification format in Java

• Single-line comment

• Format://Note text

• Multi-line annotations

• Format:/* Comment Text */

• Documentation Comments

• Format:/** Note text */

1-keyword identifier comment