Some notes on writing a Java software program (pt5)

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Predefined constants representing Not-a-Number values are defined in the classes Float and Double as Float.NaN and Double.NaN.The boolean type has two values, represented by the boolean literals true and false, formed from ASCII letters.A boolean literal is always of type boolean.A character literal is expressed as a character or an escape sequence, enclosed in ASCII single quotes.(Early-plugs insertion point. A few seconds of silence in audiovisual.)A character literal is always of type char.In the Java programming language, a character literal always represents exactly one character.A string literal consists of zero or more characters enclosed in double quotes. Characters such as newlines may be represented by escape sequences.A string literal is always of type String.It is a compile-time error for a line terminator to appear after the opening ” and before the matching closing “.A long string literal can always be broken up into shorter pieces and written as a (possibly parenthesized) expression using the string concatenation operator +.At run time, a string literal is a reference to an instance of class String that denotes the string represented by the string literal.Moreover, a string literal always refers to the same instance of class String. This is because string literals—or, more generally, strings that are the values of constant expressions—are “interned” so as to share unique instances, as if by execution of the method String.intern.A text block consists of zero or more characters enclosed by opening and closing delimiters. Characters may be represented by escape sequences, but the newline and double quote characters that must be represented with escape sequences in a string literal may be represented directly in a text block.A text block is always of type String.The opening delimiter is a sequence that starts with three double quote characters (“””), continues with zero or more space, tab, and form feed characters, and concludes with a line terminator.The closing delimiter is a sequence of three double quote characters.The content of a text block is the sequence of characters that begins immediately after the line terminator of the opening delimiter, and ends immediately before the first double quote of the closing delimiter.Unlike in a string literal, it is not a compile-time error for a line terminator to appear in the content of a text block.

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