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Java Literals

Java Question and Answer and Tutorial

A literal is a source code representation of a fixed value. They are represented directly in the code without any computation.
Literals can be assigned to any primitive type variable. For example:

byte a = 68;
char a = 'A'

byte, int, long, and short can be expressed in decimal(base 10),hexadecimal(base 16) or octal(base 8) number systems as well.
Prefix 0 is used to indicates octal and prefix 0x indicates hexadecimal when using these number systems for literals. For example:

int decimal = 100;
int octal = 0144;
inthexa = 0x64;

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\""

String and char types of literals can contain any Unicode characters. For example:

char a = '\u0001';
String a = "\u0001";

Java language supports few special escape sequences for String and char literals as well. They are:


Notation

Character represented

\n

Newline (0x0a)

\r

Carriage return (0x0d)

\f

Formfeed (0x0c)

\b

Backspace (0x08)

\s

Space (0x20)

\t

tab

\"

Double quote

\'

Single quote

\\

backslash

\ddd

Octal character (ddd)

\uxxxx

Hexadecimal UNICODE character (xxxx)

 

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