I can't pass hidden test. What's the problem?

Question

import java.util.Scanner;

abstract class Shape {
int width;
abstract void area();
}
public class Square extends Shape
{
public Square (int w)
{
width = w;
}
@Override
public void area() {
System.out.println(width * width);
}
};
public class Circle extends Shape
{
public Circle (int w)
{
width = w;
}
@Override
public void area() {
System.out.println(Math.pow(width, 2) * Math.PI);
}
};

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

I rewrite the code and solve the problem. Still don't understand why it didn't work...

import java.util.Scanner;

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