Write an object oriented program in java to find area of circle.

 Here's an example object-oriented Java program that calculates the area of a circle using the formula A = πr²:

import java.util.Scanner;

public class Circle {
    private double radius;

    public Circle(double radius) {
        this.radius = radius;
    }

    public double getRadius() {
        return radius;
    }

    public double getArea() {
        return Math.PI * radius * radius;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the radius of the circle: ");
        double radius = sc.nextDouble();
        Circle circle = new Circle(radius);
        System.out.println("The area of the circle is " + circle.getArea());
    }
}

This program defines a Circle class with a constructor that takes a radius as a parameter, as well as getRadius() and getArea() methods to get the radius and area of the circle, respectively. The getArea() method uses the formula for the area of a circle, A = πr².

In the main() method, the program prompts the user to enter the radius of the circle, creates a new Circle object with that radius, and then prints out the area of the circle using the getArea() method.