Trying to write a simple addition program, why doesn't the main class recognize the 'adder' method?

This is the main class

public static void main(string[] args) {
    scanner keyboard = new scanner (system.in);
    int number1;
    int number2;
    int result = 0;
    system.out.println("enter the first number");
    number1 = keyboard.nextint();
    system.out.println("enter the second number");
    number2 = keyboard.nextint();
    result = adder(number1, number2);
    system.out.println(result);
    keyboard.close();
}
}

This is the method class

package Relearn;

    public class methodology {
        public static int adder(int number1, int number2) {
            int num1 = number1;
            int num2 = number2;
            int sum = num1 + num2;
            
            return sum;
            }
        }

I have "adder" in the main class which is private instead of public and it works fine to put two variables together and when I move it to another class it does nothing does, just gives me the error on line 14 [Exception in thread "main" java.lang.error: Unresolved compilation issues: For type testers, method adder(int, int) is undefined In relearn.tester.main(tester.java:14)]

Correct Answer

I found some errors.

1. You mentioned that earlier you used the adder function in the same class but later you moved it to a different class. Have you imported this function? If not, you can do it in two ways -

• a) Import class (not needed if same package), ie. import Relearn.methodology; Then call methodology.adder(number1, number2);
• b) Import static functions, ie. import static Relearn.methodology.adder; - You don't need to change anything in this case.

1. Please follow the naming convention. Package names should be lowercase and class names should be named in camel case.

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