Mehod Overriding in Java

import java.util.*;
class Calculator {
	public double calculate(double a, double b) {
		return a + b;
	}
	
}

class ScientificCalculator extends Calculator {
    // @Override
	public double calculate(double a, double b) {
		return a*b;
	}
    
    
}

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        Calculator calculator = new Calculator();
        System.out.print("a = ");
        double a=sc.nextDouble();
        System.out.print("b = ");
        double b=sc.nextDouble();
        System.out.println("a+b: " + calculator.calculate(a,b));

        ScientificCalculator scientificCalculator = new ScientificCalculator();
        System.out.println("a*b: " + scientificCalculator.calculate(a, b));
    }
}