title: string cannot be converted to int! how to sum a scanned int on java?
body: <p>I wrote this simple program to sum a scanned int written by the user, but when 
  i compile it, it says that "string cannot be converted to int." What is wrong in this program?</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>import java.util.*;
  public class Pr6{
        public static void main(String[] args){
        Scanner scan = new Scanner (System.in);
        int num1;
        int num2;
        int num3;
        int sum;
  
                    System.out.print("Please write an integer: ");
         num1 = scan.nextLine();
  
                    System.out.print("Please write an integer: ");
         num2 = scan.nextLine();
  
                    System.out.print("Please write an integer: ");
         num3 = scan.nextLine();
  
         sum = num1 + num2 + num3;
                    System.out.print("Total = " + sum);
  
  
  
          }//main
  }//Pr6</code></pre>
  </div>
  </div>
  </p>