White space is defined as the ASCII space, horizontal tab, and form feed characters, as well as line terminators. The white space is used to separated the identifiers in the grammar analyze.
The Boolean type has two values, represented by the literals true and false, formed from ASCII letters.
A string literal consists of zero or more characters enclosed in double quotes. The double quotes character in a string must be prefixed by escape character. The following are examples of string literals:
"" |
The empty string |
"\"" |
A string containing " alone |
"This is a string" |
A string containing 16 characters |
An Integer literal consists of one or more digital characters. An integer literal can be only expressed in decimal.
An identifier is an unlimited-length sequence of alphabet and digits letters, the first of which must be an alphabet letter. An identifier is always case-sensitive.
A class name consists of one identifier or an unlimited-length sequence of identifier separated by the dot.