Help me Overriding in Java

Question

please help my confuse hehehehe:
want to create like this:
Sample Input:
7
2

Sample Output:
49
12.566370614359172

The area of the square is 5*5=25, while the area of the circle is PI*2*2=12.566370614359172

the program like this:
import java.util.Scanner;

abstract class Shape {
int width;
abstract void area();
}
//your code goes here
public class Square extends Shape {
public void area() {
System.out.println(width*width);
}
}

public class Circle extends Shape {
public 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();
}
}

but the overriding code are always false.

Answer 1

how about this code, because when run also result error:
public class Square extends Shape {
public void area() {
System.out.println(width*width);
}
}

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

Answer 2

Use this.width so that it will be going to call the current object

Answer 3

And make constructors too for it

Answer 4

thankyou sir, but the program still error:

/usercode/Program.java:12: error: constructor Square in class Square cannot be applied to given types;
Square a = new Square(x);
^
required: no arguments
found: int
reason: actual and formal argument lists differ in length
/usercode/Program.java:13: error: constructor Circle in class Circle cannot be applied to given types;
Circle b = new Circle(y);
^
required: no arguments
found: int
reason: actual and formal argument lists differ in length
2 errors

Answer 5

Make Circle and Square constructors

Answer 6

If you have done that then take the argument of width and write
this.width=width

Answer 7

Thankyou very much all Master, the case has solved by using this code:
```
package com.inheritence;
import java.util.Scanner;
abstract class Shape {
int width;
abstract void area();
}

class Square extends Shape {
Square(int width) {
super.width = width;
System.out.println( width * width);

}

@Override
void area() {
int luas = width*width;
}
}

class Circle extends Shape {
Circle(int width) {
super.width = width;
System.out.println( Math.PI*width * width);

}

@Override
void area() {
double luas = Math.PI*width*width;
}
}

public class Main {

public static void main(String[] args) {
// write your code here
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();

}
}
```