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 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 Circ...