How to define a constant in Java?

In Java, the keyword ‘final’ can be used to define a constant. A constant is a variable whose value cannot be changed.

You can define a constant using the following syntax.

final dataType CONSTANT_NAME = value;

In which, dataType refers to the data type of the constant, CONSTANT_NAME represents the name of the constant, and value indicates the value of the constant.

For example, to define an integer constant MAX_VALUE with a value of 100, you can write it like this:

final int MAX_VALUE = 100;

Note that it is a common practice to capitalize all constant names and use underscores to separate words, making it easier to identify constants and variables.

Once a constant is defined in programming, it cannot be changed. If one attempts to modify the value of a constant, the compiler will generate an error. Constants are typically defined at the top of a class or within a method.