final keyword in Java

In Java, the “final” keyword is used to indicate that a variable, method, or class cannot be changed or extended after it has been defined. Here are some examples and rules related to the use of the “final” keyword:

Final Variables: When a variable is declared as final, its value cannot be changed once it has been assigned. Here’s an example:

final int MAX_VALUE = 100;

In this example, “MAX_VALUE” is declared as a final variable, and its value is set to 100. This value cannot be changed later in the program.

Final Methods: When a method is declared as final, it cannot be overridden by a subclass. Here’s an example:

public class MyClass {
    public final void myMethod() {
        // Method code here
    }
}

In this example, “myMethod” is declared as a final method, which means that it cannot be overridden by a subclass of “MyClass”.

Final Classes: When a class is declared as final, it cannot be extended by a subclass. Here’s an example: