Question

what are constants in java?​

Answer 1

A constant is a variable whose value cannot change once it has been assigned. Java doesn't have built-in support for constants, but the variable modifiers static and final can be used to effectively create one.

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Answer 2

Answer:

• Literals often referred to as constants are data items that are fixed data values.

• Java allows several kinds of literals:

1. Integer-literal
2. Floating literals
3. Boolean literal
4. Character literal
5. String literal
6. The null literal

• An integer constant must have at least one digit and must not contain any decimal point.

• It may contain either + or - sign.

• A number with no sign is assumed to be positive.

• Commas cannot appear in an integer constant.

• Real literal in fractional form must have at least one digit before a decimal point and at least one digit after the decimal point.

• It may also have either + or - sign preceding it.

• A real literal with no sign is assumed to be positive.

• Real literal in exponent form has two parts : a mantissa and an exponent.

• the mantissa must be either an integer or proper real literal.

• The mantissa is followed by a letter E or e and the exponent.

• The exponent must be an integer.