What is constants in Java ?

What is constants in Java ?

• An element of program whose value can not be changed at the time of execution of program is called constant.
• It is also called literals.
• It may be int,float and character data type.

Rules for constructing integer constant

• It must have atleast one digit.
• It must not have a decimal point.
• It may be positive or negative.
• No comma or blank space are allowed in integer constant.

Rules for constructing floating point constant

• It must have atleast one digit.
• It must have a decimal point.
• It may be positive or negative.
• No comma or blank space are allowed in floating point constant.

Rules for constructing character constant

• It is a single alphabet,digit or special symbol.
• The length of character constant is 1 character.
• Character constant is enclosed within single quotes (Example char c='A';).