How can fix it

Question

import java.util.Scanner;

abstract class Shape {
int width=0;
abstract void area();
}
class Square extends Shape {
public void area(int width){
System.out.println(width*width);
}
}
class Circle extends Shape {
public void area(int width){
System.out.println(width*width*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

You don't have any constructor to pass x and y u have to pass x and y to area

Like
a.area(x)
And b.area(y)
import java.util.Scanner;

abstract class Shape {
int width=0;
abstract void area(int width);
}
class Square extends Shape {
public void area(int width){
System.out.println(width*width);
}
}
class Circle extends Shape {
public void area(int width){
System.out.println(width*width*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();
Circle b = new Circle();
a.area(x);
b.area(y);
}
}

Answer 2

Thnk u brother