Use the program shown in Table 1, then change the interface Payable to an Abstra

Question

Use the program shown in Table 1, then change the interface Payable to an Abstract class. Payable interface declaration 1 // Payable.java 2 // Payable interface declaration. 3 4 public interface Payable 5 { 6 double getPaymentAmount(); // calculate payment; no implementation 7 } // end interface Payable Invoice class that implements Payable 1 // Invoice.java 2 // Invoice class implements Payable. 3 4 public class Invoice implements Payable 5 { 6 private String partNumber; 7 private String partDescription; 8 private int quantity; 9 private double pricePerItem; 10 11 // four-argument constructor 12 public Invoice( String part, String description, int count, 13 double price ) 14 { 15 partNumber = part; 16 partDescription = description; 17 setQuantity( count ); // validate and store quantity 18 setPricePerItem( price ); // validate and store price per item 19 } // end four-argument Invoice constructor 20 21 // set part number 22 public void setPartNumber( String part ) 23 { 24 partNumber = part; 25 } // end method setPartNumber 26 27 // get part number 28 public String getPartNumber() 29 { 30 return partNumber; 31 } // end method getPartNumber 32 33 // set description 34 public void setPartDescription( String description ) 35 { 36 partDescription = description; 37 } // end method setPartDescription 38 39 // get description 40 public String getPartDescription() 41 { 42 return partDescription; 43 } // end method getPartDescription 44 45 // set quantity 46 public void setQuantity( int count ) 47 { 48 quantity = ( count < 0 ) ? 0 : count; // quantity cannot be negative 49 } // end method setQuantity 50 51 // get quantity 52 public int getQuantity() 53 { 54 return quantity; 55 } // end method getQuantity 56 57 // set price per item 58 public void setPricePerItem( double price ) 59 { 60 pricePerItem = ( price < 0.0 ) ? 0.0 : price; // validate price 61 } // end method setPricePerItem 62 63 // get price per item 64 public double getPricePerItem() 65 { 66 return pricePerItem; 67 } // end method getPricePerItem 68 69 // return String representation of Invoice object 70 public String toString() 71 { 72 return String.format( "%s: %s: %s (%s) %s: %d %s: $%,.2f", 73 "invoice", "part number", getPartNumber(), getPartDescription(), 74 "quantity", getQuantity(), "price per item", getPricePerItem() ); 75 } // end method toString 76 77 // method required to carry out contract with interface Payable 78 public double getPaymentAmount() 79 { 80 return getQuantity() * getPricePerItem(); // calculate total cost 81 } // end method getPaymentAmount 82 } // end class Invoice Payable interface test program processing Invoices and Employees polymorphically. 1 // PayableInterfaceTest.java 2 // Tests interface Payable. 3 4 public class PayableInterfaceTest 5 { 6 public static void main( String args[] ) 7 { 8 // create four-element Payable array 9 Payable payableObjects[] = new Payable[ 4 ]; 10 11 // populate array with objects that implement Payable 12 payableObjects[ 0 ] = new Invoice( "01234", "seat", 2, 375.00 ); 13 payableObjects[ 1 ] = new Invoice( "56789", "tire", 4, 79.95 ); 14 payableObjects[ 2 ] = 15 new SalariedEmployee( "John", "Smith", "111-11-1111", 800.00 ); 16 payableObjects[ 3 ] = 17 new SalariedEmployee( "Lisa", "Barnes", "888-88-8888", 1200.00 ); 18 19 System.out.println( 20 "Invoices and Employees processed polymorphically: " ); 21 22 // generically process each element in array payableObjects 23 for ( Payable currentPayable : payableObjects ) 24 { 25 // output currentPayable and its appropriate payment amount 26 System.out.printf( "%s %s: $%,.2f ", 27 currentPayable.toString(), 28 "payment due", currentPayable.getPaymentAmount() ); 29 } // end for 30 } // end main 31 } // end class PayableInterfaceTest

Explanation / Answer

NOT IN ORDER . NOT CLEAR , ITS SCAM , RE POST

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