Overloaded Constructor

import java.util.Scanner;
class Quadrilateral{
        int length, breadth;
    A(){
        length = 0;
        breadth = 0;
    }
        A(int side){
                length = side;
                breadth = side;
        }
        A(int length, int breadth){
                this.breadth = breadth;
                this.length = length;
        }
        int area(){
                return length*breadth;
        }
}
class FindArea{
        public static void main(String[] args){
                Scanner sc = new Scanner(System.in);
                System.out.print("1.Square 2.Rectangle: ");
                int choice = sc.nextInt();
                switch(choice){
                        case 1: System.out.print("Enter the side: ");
                                int side = sc.nextInt();
                                System.out.println(new A(side).area());
                                break;
                        case 2: System.out.println("Enter the length & breadth:-");
                                int length = sc.nextInt();
                                int breadth = sc.nextInt();
                                System.out.println(new A(length, breadth).area());
                                break;
                }
        }
}