We are now ready for our menu to offer all three of the possible options. 

Code Adjustments

MenuItem lineChoice = addMenuItem("Graph", "Line");
MenuItem barChoice = addMenuItem ("Graph", "Bar");
MenuItem pieChoice = addMenuItem ("Graph", "Pie");

public void menuItemSelected (MenuItem item)
{
       if (item == lineChoice)
             graphChoice = 'L';
      else if (item == barChoice)
             graphChoice = 'B';
      else if (item == pieChoice)
             graphChoice = 'P';
      repaint();
}

 
public void paint (Graphics g)
{
         getInputData();
         switch (graphChoice)
         {
                case 'L': {
                              drawLineGraph(g);
                              break;
                               }
               case 'B': {
                              drawBarGraph(g);
                              break;
                              }
              case 'P': {
                             drawPieGraph(g);
                             break;
                             }
        }
}