// Fig. 10.14: PayableInterfaceTest.java
// Payable interface test program processing Invoices and 
// Employees polymorphically.
public class PayableInterfaceTest {
   public static void main(String[] args) {
      // create four-element Payable array
      Payable[] payableObjects = new Payable[] {
         new Invoice("01234", "seat", 2, 375.00),
         new Invoice("56789", "tire", 4, 79.95),
         new SalariedEmployee("John", "Smith", "111-11-1111", 800.00),
         new SalariedEmployee("Lisa", "Barnes", "888-88-8888", 1200.00)
      };

      System.out.println(
         "Invoices and Employees processed polymorphically:"); 

      // generically process each element in array payableObjects
      for (Payable currentPayable : payableObjects) {
         // output currentPayable and its appropriate payment amount
         System.out.printf("%n%s %npayment due: $%,.2f%n", 
            currentPayable.toString(), // could invoke implicitly
            currentPayable.getPaymentAmount()); 
      } 
   } 
} 


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