Write A Program In Java Demonstrate The Use Of “final” Keyword

Write A Program In Java To Demonstrate The Use Of “final” Keyword.

In this program, we will create a java program to demonstrate the use of “final” keyword.

In Java, the final keyword is used to indicate that a variable, method, or class cannot be modified or extended. The final  keyword can be applied to variables, methods and classes.

A final variable cannot be changed once it has been initialized. If a final variable has no value, it is called a blank final variable or uninitialized final variable. It can only be initialized in the constructor.

A final method cannot be overridden by subclasses. This means that if you have a method in a superclass that you do not want subclasses to change, you can declare it as final.

A final class cannot be extended by other classes. This means that if you have a class that you do not want other classes to inherit from, you can declare it as final.

Here's a program in java that show the use of "final" keyword:

Program

public class FinalExample {
    // final variable
    final int x = 10;
    // final method
    public final void display() {
        System.out.println("This is a final method.");
    }
    public static void main(String[] args) {
        FinalExample obj = new FinalExample();
        System.out.println("Value of x: " + obj.x);
        obj.display();
    }
}   

Output

Value of x: 10

Explanation

In this example, we have a final variable x and a final method display(). The final keyword can be used to prevent a variable from being reassigned or to prevent a method from being overridden.

When we create an object of the FinalExample class and call its methods, we can see that the value of the final variable x cannot be changed. We also see that attempting to override the final method in a subclass produces an error.

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