How to define constants in Java

In Java, the final keyword can be used to define constants. Once a constant is assigned a value, that value cannot be changed.

The format for defining a constant is: final data type constant name = value;

Here are some examples of constant definitions:

final int MAX_NUMBER = 100;
final double PI = 3.14159;
final String MESSAGE = "Hello, World!";

Note: According to Java naming conventions, constant names are typically written in uppercase letters with underscores in order to differentiate them from variables.