Constants

Numeric, character, string, or Boolean values within a Java program that remain unchanged, or constant, during program execution can either have a name or be unnamed.

Unnamed constants

Earlier, we defined a literal as the Java representation of a specific fixed value, that is, a value that does not change. They are, in fact, unnamed constants. Literals conform to certain rules according to their data type:

• Integer literals are a sequence of digits without a decimal point or commas but can have a plus or minus sign. For example, 10 and –52 are integer literals.
• Floating-point literals are real numbers without commas but can have a plus or minus sign. They are written in one of two ways:
  • Without an exponent but with a decimal point. For example, 3.14,

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