问对象之间的Java OOP功能

EN

import java.util.Scanner;


public class ObjectFunctionality {
    public static void main(String args[]) {
        Printer thing = new Printer();
        thing.Print();
    }
}

//  Write the missing class here
//  Class is written in the text box below.

class Calculator {
    static int Sum(int first, int second) {
        int sum = first + second;
        return sum;
    }
}

class Printer {
        Scanner input = new Scanner(System.in);
    System.out.print("Type in the first integer: ");
    int first = reader.nextInt();
    System.out.print("Type in the second integer: ");
    int second = reader.nextInt();


    System.out.print("Sum of the numbers: " + sum.sum);


}