Can't display my variable's content

Question

/*I believe the above below should return the value of 11, but instead, I get this: "java: cannot find symbol
symbol: variable summ
location: class Calculator"
Pls, what's the problem?*/

public class Calculator {

//creating a method to add integers
public Integer adder (int first, int second){
int summ = first+second;//declaring the variable to hold the sum
return summ;
}
//creating the main method
public static void main(String[] args) {
//creating an object of the calculator class
Calculator to_add = new Calculator();
//using the method created earlier to add 9 and 2 together
to_add.adder(9,2);
//trying to display the sum of 9 and 2
System.out.println("The sum is" + summ);

}

}

Answer 1

You call adder() method without assigning the return value into any variable.

Create an `Integer` variable named <summ> in main() method to receive the value returned by adder() method.

Integer summ = to_add.adder( 9, 2 );

Answer 2

Thx