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by Dinesh Thakur

Constants :- Constants in java are fixed values those are not changed during the Execution of program java supports several types of Constants  those are  

1) Integer Constants:-  Integer Constants refers to a Sequence of digits which Includes only negative or positive Values and many other things those are as follows

  •   An Integer Constant must have at Least one Digit
  •   it must not have a Decimal value
  •   it could be either positive or Negative
  •   if no sign is Specified then it should be treated as Positive
  •  No Spaces and Commas are allowed in Name

2) Real Constants :-  

  • A Real  Constant must have at Least one Digit
  • it must  have a Decimal value
  • it could be either positive or Negative
  • if no sign is Specified then it should be treated as Positive
  • No Spaces and Commas are allowed in Name

Like 251, 234.890 etc are Real Constants

In The Exponential Form of Representation the Real Constant is Represented in the two Parts The part before appearing e is called mantissa whereas the part following e is called Exponent.

  •  In Real Constant The Mantissa and Exponent Part should be Separated by letter e
  •  The Mantissa Part have may have either positive or Negative Sign
  •  Default Sign is Positive

Single Character Constants:-  


A Character is Single Alphabet a single digit or a Single Symbol that is enclosed within Single inverted commas.

Like ‘S’ ,’1’ etc are Single  Character Constants

String Constants:-  String is a Sequence of Characters Enclosed between double Quotes These Characters may be digits ,Alphabets  Like “Hello” , “1234” etc.

Backslash Character Constants:- Java Also Supports Backslash Constants those are used in output methods For Example \n is used for new line Character These are also Called as escape Sequence or backslash character Constants For Ex:    

                   \t  For Tab  ( Five Spaces in one Time )

                   \b Back Space etc.