BlueJ Program to print the series (1*2)+(2*3)+......+(19*20)

Here is the BlueJ program.

class S

{

  

   int i;

   long lg=0;

    public void show()

    {

        for(i=1;i< 20;i++)

        {

            lg=lg+(i*(i+1));

        }

        System.out.println("Series="+lg);

    }

        public static void main(String args[])

        {

             S ob=new S();

             ob.show();

            }

        }

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