The document outlines Java classes and interfaces related to geometric objects, specifically focusing on circles and their properties. It includes the implementation of methods for calculating perimeter and area, as well as functionalities for resizing circles. A driver class demonstrates creating circle objects, displaying their dimensions, and applying the resize functionality.

1. GeometricObject.java
public interface GeometricObject {
//Declaring abstract methods
public double getPerimeter();
public double getArea();
}
___________________________________________
Circle.java
public class Circle implements GeometricObject {
//Declaring variable
double radius = 1.0;
//Declaring constant
public static final double PI = 3.14159;
//Parameterized constructor
public Circle(double radius) {
super();
this.radius = radius;
}
//Setters and getters
public double getRadius() {
return radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
//getPerimeter() calculates the perimeter and return it
@Override
public double getPerimeter() {
return 2 * PI * this.radius;
}
//getArea() calculates area and return it
@Override

2. public double getArea() {
return PI * this.radius * this.radius;
}
}
___________________________________________
Resizable.java
public interface Resizable {
//Declaring abstract method
public void resize(int percent);
}
_________________________________________________
ResizableCircle.java
public class ResizableCircle extends Circle implements Resizable {
//parameterized ResizableObject
public ResizableCircle(double radius) {
super(radius);
}
//resize() method will change the radius of the circle based on percent
@Override
public void resize(int percent) {
double radius=getRadius();
radius=radius+((radius*percent)/100);
setRadius(radius);
}
}
___________________________________________
DriverClass.java
import java.text.DecimalFormat;
public class DriverClass {
public static void main(String[] args) {
//DecimalFormat Object is used to format the number
DecimalFormat df=new DecimalFormat("#.##");

3. //Creates an circle object by passing radius as parameter
Circle c=new Circle(10);
//Displaying the perimeter of the circle
System.out.println("Perimeter of the Circle :"+df.format(c.getPerimeter()));
//Displaying the area of the circle
System.out.println("Area of the Circle :"+df.format(c.getArea()));
//creating the object of the Resizable object by passing radius as parameter
ResizableCircle rc=new ResizableCircle(20);
//Displaying perimeter and area of the circle before resizing the radius
System.out.println(" _______Before Resizing the Radius_______");
System.out.println("Perimeter of the Circle :"+df.format(rc.getPerimeter()));
System.out.println("Area of the Circle :"+df.format(rc.getArea()));
//Performing the resize
rc.resize(50);
//Displaying perimeter and area of the circle after resizing the radius
System.out.println(" _______After Resizing the Radius_______");
System.out.println("Perimeter of the Circle :"+df.format(rc.getPerimeter()));
System.out.println("Area of the Circle :"+df.format(rc.getArea()));
}
}
________________________________________________
Output:
Perimeter of the Circle :62.83
Area of the Circle :314.16
_______Before Resizing the Radius_______
Perimeter of the Circle :125.66
Area of the Circle :1256.64
_______After Resizing the Radius_______

4. Perimeter of the Circle :188.5
Area of the Circle :2827.43
_______________________________________Thank YOu
Solution
GeometricObject.java
public interface GeometricObject {
//Declaring abstract methods
public double getPerimeter();
public double getArea();
}
___________________________________________
Circle.java
public class Circle implements GeometricObject {
//Declaring variable
double radius = 1.0;
//Declaring constant
public static final double PI = 3.14159;
//Parameterized constructor
public Circle(double radius) {
super();
this.radius = radius;
}
//Setters and getters
public double getRadius() {
return radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
//getPerimeter() calculates the perimeter and return it
@Override

5. public double getPerimeter() {
return 2 * PI * this.radius;
}
//getArea() calculates area and return it
@Override
public double getArea() {
return PI * this.radius * this.radius;
}
}
___________________________________________
Resizable.java
public interface Resizable {
//Declaring abstract method
public void resize(int percent);
}
_________________________________________________
ResizableCircle.java
public class ResizableCircle extends Circle implements Resizable {
//parameterized ResizableObject
public ResizableCircle(double radius) {
super(radius);
}
//resize() method will change the radius of the circle based on percent
@Override
public void resize(int percent) {
double radius=getRadius();
radius=radius+((radius*percent)/100);
setRadius(radius);
}
}
___________________________________________
DriverClass.java
import java.text.DecimalFormat;
public class DriverClass {

6. public static void main(String[] args) {
//DecimalFormat Object is used to format the number
DecimalFormat df=new DecimalFormat("#.##");
//Creates an circle object by passing radius as parameter
Circle c=new Circle(10);
//Displaying the perimeter of the circle
System.out.println("Perimeter of the Circle :"+df.format(c.getPerimeter()));
//Displaying the area of the circle
System.out.println("Area of the Circle :"+df.format(c.getArea()));
//creating the object of the Resizable object by passing radius as parameter
ResizableCircle rc=new ResizableCircle(20);
//Displaying perimeter and area of the circle before resizing the radius
System.out.println(" _______Before Resizing the Radius_______");
System.out.println("Perimeter of the Circle :"+df.format(rc.getPerimeter()));
System.out.println("Area of the Circle :"+df.format(rc.getArea()));
//Performing the resize
rc.resize(50);
//Displaying perimeter and area of the circle after resizing the radius
System.out.println(" _______After Resizing the Radius_______");
System.out.println("Perimeter of the Circle :"+df.format(rc.getPerimeter()));
System.out.println("Area of the Circle :"+df.format(rc.getArea()));
}
}
________________________________________________
Output:
Perimeter of the Circle :62.83

7. Area of the Circle :314.16
_______Before Resizing the Radius_______
Perimeter of the Circle :125.66
Area of the Circle :1256.64
_______After Resizing the Radius_______
Perimeter of the Circle :188.5
Area of the Circle :2827.43
_______________________________________Thank YOu