Calculator2.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Calculator2 {
    String number1;
    String number2;
    String operation;


    public void getInput() throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Enter the first number: ");
        number1 = reader.readLine();
        System.out.print("Enter the second number: ");
        number2 = reader.readLine();
        System.out.print("Enter operation (+, -, /, +): ");
        operation = reader.readLine();

        System.out.print(number1 + " " + operation + " " + number2 + " = ");
    }

    public void operate() {
        int number1AsInteger = Integer.parseInt(number1);
        int number2AsInteger = Integer.parseInt(number2);
        if(operation.equals("+")) {
            System.out.println(number1AsInteger + number2AsInteger);
        } else if(operation.equals("-")) {
            //do this
        } else if(operation.equals("*")) {
            //do this as well
        } else if(operation.equals("/")) {
            //do this too
            //but check first if number2 is not zero,
            //if number 2 is zero, print an error message to the user
            //if number 2 is not zero perform the operation
        } else {
            System.out.println("The user has entered an invalid operation. What do we do???");
        }
    }

    public static void main(String args[]) throws IOException {
        Calculator2 calculator2 = new Calculator2();
        calculator2.getInput();
        calculator2.operate();
    }
}