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Floating-Point Literals
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Floating-point numbers represent decimal values with a fractional component They can be expressed in either standard or scientific notation Standard notation consists of a whole number component followed by a decimal point followed by a fractional component For example, 20, 314159, and 06667 represent valid standard-notation floating-point numbers Scientific notation uses a standard-notation, floating-point number plus a suffix that specifies a power of 10 by which the number is to be multiplied The exponent is indicated by an E or e followed by a decimal number, which can be positive or negative Examples include 6022E23, 314159E 05, and 2e+100 Floating-point literals in Java default to double precision To specify a float literal, you must append an F or f to the constant You can also explicitly specify a double literal by appending a D or d Doing so is, of course, redundant The default double type consumes 64 bits of storage, while the less-accurate float type requires only 32 bits
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Boolean Literals
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Boolean literals are simple There are only two logical values that a boolean value can have, true and false The values of true and false do not convert into any numerical representation The true literal in Java does not equal 1, nor does the false literal equal 0 In Java, they can only be assigned to variables declared as boolean, or used in expressions with Boolean operators
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Characters in Java are indices into the Unicode character set They are 16-bit values that can be converted into integers and manipulated with the integer operators, such as the addition and subtraction operators A literal character is represented inside a pair of single quotes All of the visible ASCII characters can be directly entered inside the quotes, such as a , z , and @ For characters that are impossible to enter directly, there are several escape sequences that allow you to enter the character you need, such as \ for the single-quote character itself and \n for the newline character There is also a mechanism for directly entering the value of a character in octal or hexadecimal For octal notation, use the backslash followed by the three-digit number For example, \141 is the letter a For hexadecimal, you enter a backslash-u (\u), then exactly four hexadecimal digits For example, \u0061 is the ISO-Latin-1 a because the top byte is zero \ua432 is a Japanese Katakana character Table 3-1 shows the character escape sequences
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String Literals
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String literals in Java are specified like they are in most other languages by enclosing a sequence of characters between a pair of double quotes Examples of string literals are Hello World two\nlines \ This is in quotes\
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D a t a Ty p e s , Va r i a b l e s , a n d A r r a y s
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TABLE 3-1
Character Escape Sequences
Escape Sequence \ddd \uxxxx \' \" \\ \r \n \f \t \b
Description Octal character (ddd) Hexadecimal Unicode character (xxxx) Single quote Double quote Backslash Carriage return New line (also known as line feed) Form feed Tab Backspace
The escape sequences and octal/hexadecimal notations that were defined for character literals work the same way inside of string literals One important thing to note about Java strings is that they must begin and end on the same line There is no line-continuation escape sequence as there is in some other languages
NOTE As you may know, in some other languages, including C/C++, strings are implemented as
arrays of characters However, this is not the case in Java Strings are actually object types As you will see later in this book, because Java implements strings as objects, Java includes extensive string-handling capabilities that are both powerful and easy to use
Variables
The variable is the basic unit of storage in a Java program A variable is defined by the combination of an identifier, a type, and an optional initializer In addition, all variables have a scope, which defines their visibility, and a lifetime These elements are examined next