Can we override the variables in class like we do for a Method?

Yes. We can inherit any functionality from parent class in child classes, be it method, variables, using constructors with super keyword or even inner classes also

See this example for variables and methods:

class Calculation {
   int z;
	
   public void addition(int x, int y) {
      z = x + y;
      System.out.println("The sum of the two numbers is:"+z);
   }
	
   public void Subtraction(int x, int y) {
      z = x - y;
      System.out.println("The difference of two numbers is :"+z);
   }
}

public class My_Calculation extends Calculation {
   public void multiplication(int x, int y) {
      z = x * y;
      System.out.println("The product of the given numbers:"+z);
   }
	
   public static void main(String args[]) {
      int a = 20, b = 10;
      My_Calculation demo = new My_Calculation();
      demo.addition(a, b);
      demo.Subtraction(a, b);
      demo.multiplication(a, b);
   }
}

Thanks Yogesh, Got it.