Learn how to implement a constant in Java using final, static, enum, and annotation. ... For example, you can declare a constant named PI with the value of 3.14 as follows: ...

For example, suppose package physics contains a Math class that’s identical to java.lang‘s Math class in that it implements the same PI constant and trigonometric methods.

Java lacks a true (or enforceable) idea of a constant. The final keyword makes a variable immutable, but only in the sense that it cannot change its reference. This having been said, a final variable ...