The Java foundation: Comment keyword identifier Jshell

There are Jshell tools in Java 10 that allow users to enter relevant Java code directly.

Note: Java is divided into single-line comments//Multiline comments/* */Documentation Comments/** */

Keywords: pre-defined, meaningful identifiers in Java. The Java keyword is important for compilers to represent a number type, or to represent a program structure. The keyword cannot be used as a variable name, method name, class name, package name, and parameter.

The JDK later adds the Assert, enum keyword.

Reserved words: Keywords that are reserved in Java may be used later. (Goto const)

Identifiers: Consists of letters, numbers, underscores (_), Dollar signs ($), cannot start with a number (also supports kanji), and cannot use the Java keyword. Identifiers include class names, variable names, constant names, and functions.

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The Java foundation: Comment keyword identifier Jshell