Help with 55 Code Project

Question

Can someone help me figure out what I'm doing wrong? I'm supposed to tell the program to calculate the area of a square and a circle, I did that but my code doesn't seem to be working. Here is the code I have so far:

import java.util.Scanner;

abstract class Shape {
int width;
abstract void area();
}
//your code goes here
class Square extends Shape {
public void area() {
a.area = int x*int x;
return area;
}
}
class Square extends Shape {
b.area = Math.PI(3.14*2*2);
return area;
}

public class Program {
public static void main(String[ ] args) {
Scanner sc = new Scanner(System.in);
int x = sc.nextInt();
int y = sc.nextInt();

Square a = new Square(x);
Circle b = new Circle(y);
a.area();
b.area();
}
}

Answer 1

class Square extends Shape{
public Square(int w) {
width=w;
};
public void area() {
System.out.println(width*width);
};
}

class Circle extends Shape{
public Circle(int w) {
width=w;
};
public void area() {
System.out.println(Math.PI*width*width);
};
}