title: Scanner in = new Scanner(System.in);
body: <pre><code>public class Adder
  {
  public static void main(String arr[])
      {
      //System.in represents Standard Input Device (Keyboard)
      //Explain this next line, please:
      Scanner in = new Scanner(System.in);    
      System.out.println("Enter First No.");    
      int a = in.nextInt();    
      System.out.println("Enter Second No.");    
      int b = in.nextInt();    
      int c = a+b;    
      System.out.println("Sum is: "+c);    
      }    
  }
  </code></pre>
  
  <p>I just started learning JAVA and i came across this code.Can someone explain me what does the <em>marked line</em> signify ?</p>