I can't find error in my Java Shapes Project .Help

Question

import java.util.Scanner;

abstract class Shape {
int width;
abstract void area();
}
public class Square extends Shape{

Square(int width){
@Override

void area() {

System.out.println(width*width);
}
}
}
public class Circle extends Shape{

Circle(int width){

@Override

void area() {

System.out.println(Math.PI*width*width);
}
}
}

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 are adding method inside a constructor method which is invalid.
Complete constructor by assinging passed parameter value into width variable and next, after it add area() method..

Answer 2

Rez Smith In your code , example for Square:
Square ( int w) {
this.width = w;
}

Here, passing to w, then assign it width of super class Shape variable which is value you are using to find area..
Similar do in Circle.

Answer 3

import java.util.Scanner;

abstract class Shape {
int width;
abstract void area();
}
public class Square extends Shape{

Square(int width){}
@Override
void area() {

System.out.println(width*width);
}
}
public class Circle extends Shape{

Circle(int width){}
@Override
void area() {
System.out.println(Math.PI*width*width);
}
}

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 4

I don't know how to use passed parameter .can anyone show answer code

Answer 5

Jayakrishna🇮🇳 Thanks