Create a 2 separate Classes CIRCLE  with private data members - Radius and Area, and RECTANGLE with private data members - Length, Breadth and Area. In each of these classes declare and define the member methods putData() [ To display Area ] and computeArea()[ To Compute Area ] are the private and getData() as public member method to read Radius or Length and Breadth based on the choice('C' or 'R'). As a programmer, Write a java program and subsequent pseudocode, to find the area of circle/rectangle using class CIRCLE/RECTANGLE which have following details:getData() to read either radius or lenght and breadth based on the choice 'C' or 'R'Calculate the area using computeArea()Display the Area using putData().Note :Radius is always +Ve, otherwise print "Invalid Radius"Length and Breadth are +Ve, otherwise print "Invalid Length(if Length is -VE) or Invalid Breadth(if Breadth is -VE) or "Invalid Length and Breadth"Input : First line Read the type ('C'  or 'R')Second line onwards read Radius(if Type = 'C') or Length and Breadth (if Type = 'R')Output :  print Area

Here is the Java code for the problem:

import java.util.Scanner;

class CIRCLE {
    private double radius;
    private double area;

    public void getData() {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the radius:");
        radius = sc.nextDouble();
        if (radius < 0) {
            System.out.println("Invalid Radius");
            System.exit(0);
        }
    }

    private void computeArea() {
        area = Math.PI * radius * radius;
    }

    private void putData() {
        System.out.println("The area of the circle is " + area);
    }

    public void calculate() {
        getData();
        computeArea();
        putData();
    }
}

class RECTANGLE {
    private double length;
    private double breadth;
    private double area;

    public void getData() {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the length and breadth:");
        length = sc.nextDouble();
        breadth = sc.nextDouble();
        if (length < 0 && breadth < 0) {
            System.out.println("Invalid Length and Breadth");
            System.exit(0);
        } else if (length < 0) {
            System.out.println("Invalid Length");
            System.exit(0);
        } else if (breadth < 0) {
            System.out.println("Invalid Breadth");
            System.exit(0);
        }
    }

    private void computeArea() {
        area = length * breadth;
    }

    private void putData() {
        System.out.println("The area of the rectangle is " + area);
    }

    public void calculate() {
        getData();
        computeArea();
        putData();
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter 'C' for Circle or 'R' for Rectangle:");
        char choice = sc.next().charAt(0);
        if (choice == 'C') {
            CIRCLE circle = new CIRCLE();
            circle.calculate();
        } else if (choice == 'R') {
            RECTANGLE rectangle = new RECTANGLE();
            rectangle.calculate();
        } else {
            System.out.println("Invalid choice");
        }
    }
}

And here is the pseudocode:

class CIRCLE
    declare private double radius
    declare private double area

    method getData
        print "Enter the radius:"
        read radius
        if radius < 0 then
            print "Invalid Radius"
            exit program
        end if
    end method

    method computeArea
        area = PI * radius * radius
    end method

    method putData
        print "The area of the circle is " + area
    end method

    method calculate
        call getData
        call computeArea
        call putData
    end method
end class

class RECTANGLE
    declare private double length
    declare private double breadth
    declare private double area

    method getData
        print "Enter the length and breadth:"
        read length and breadth
        if length < 0 and breadth < 0 then
            print "Invalid Length and Breadth"
            exit program
        else if length < 0 then
            print "Invalid Length"
            exit program
        else if breadth < 0 then
            print "Invalid Breadth"
            exit program
        end if
    end method

    method computeArea
        area = length * breadth
    end method

    method putData
        print "The area of the rectangle is " + area
    end method

    method calculate
        call getData
        call computeArea
        call putData
    end method
end class

main program
    print "Enter 'C' for Circle or 'R' for Rectangle:"
    read choice
    if choice is 'C' then
        create object circle of class CIRCLE
        call circle.calculate
    else if choice is 'R' then
        create object rectangle of class RECTANGLE
        call rectangle.calculate
    else
        print "Invalid choice"
    end if
end main program