Java Literals

Java Literals are syntactic representations of boolean, character, numeric, or string data. Literals provide a means of expressing specific values in a program. For example, in the following statement, an integer variable named count is declared and assigned an integer value. The literal 0 represents, naturally enough, the value zero.

int count = 0;

The following code section contains two number literals followed by two boolean literals at line 1, one string literal followed by one number literal at line 2, and one string literal followed by one real number literal at line 3:

Line 1: (2 > 3) ? true : false;
Line 2: "text".substring(2);
Line 3: System.out.println("Display a hard coded float: " + 37.19f);


Boolean Literals

There are two boolean literals:

true represents a true boolean value

false represents a false boolean value

Numeric Literals

There are three types of numeric literals in Java:

Integer Literals

In Java, you may enter integer numbers in several formats such as decimals, octal numbers, hexadecimal numbers and numbers starting with 0b.

Floating Point Literals

Floating point numbers are expressed as decimal fractions or as exponential notation:

double decimalNumber = 5.0;
decimalNumber = 5d;
decimalNumber = 0.5;
decimalNumber = 10f;
decimalNumber = 3.14159e0;
decimalNumber = 2.718281828459045D;
decimalNumber = 1.0e-6D;

Character Literals

Java characters are sixteen bit Unicode characters, ranging from 0 to 65535. Character literals are expressed in Java as a single quote, the character, and a closing single quote ('a', '7', '$', 'Ï€').

References : Wikibooks share on :        :  

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