How to use variable in class in main method?

Question

package org.opentutorials.javatutorials.inheritance;

import java.util.Scanner;

class CalculatorX {
static Scanner sc = new Scanner(System.in);
static int left = sc.nextInt();
static int right = sc.nextInt();

public void sum() {
System.out.println(left + right);
}

public void avg() {
System.out.println((left + right) / 2);
}
}

class SubtractCalculatorX extends CalculatorX {
public void sub() {
System.out.println(left - right);
}
}
public class CalculatorDemoX {

public static void main(String[] args) {

SubtractCalculatorX c1 = new SubtractCalculatorX();
//System.out.printf(left + " + " + right);
c1.sum();
c1.avg();
c1.sub();
}

}

I want to make // part possible. However, It seems that java cannot bring left and right value to main method. How can I use left and right value?

Answer 1

A minimal example for your reference.

class Test {
static int x = 39;
}

public class Program
{
public static void main(String[] args) {

System.out.print(Test.x);
}
}

Answer 2

Try using public class calculator!

Or try calling left and right by calculator object

Calculator c = new Calculator ();
System.out.println(c.left+"+"+right);

Answer 3

thanks! You both helped me a lot!