In your code, return statement was missing.

Here is the code:

class MOrders {
int nooforders;

 public int getorder() {
     nooforders = 500; 
     return nooforders;
     } 
     public void displayorders() {
         System.out.println("The number of orders to be delivered: "+ nooforders); 
         } 
         public static void main(String args[]) {
             MOrders obj = new MOrders ();
             obj.getorder(); 
             obj.displayorders();
    }
}