A constant value in a program is denoted by a literal. Literals represent numerical (integer or floating-point),
 character, boolean or string values.

In Java programming language there are some special type of literals that represent numbers, characters, strings and boolean values. 

Example of literals:

Integer literals:
56 0 -4

Floating-point literals:
.5 f,0.5 ,f3.14f

Character literals:
'(' 'M' 'm' '{'

Boolean literals:(predefined values)
true false

String literals:
"java" "0.7" "M" ""