I need help with this assignment
(Calculating Sales) An online retailer sells five products whose retail prices are as follows: Product 1, $2.98; product 2, $4.50; product 3, $9.98; product 4, $4.49 and product 5, $6.87. Write an application that reads a series of pairs of numbers as follows:

a) product number

b) quantity sold

Your program should use a switch statement to determine the retail price for each product. It should calculate and display the total retail value of all products sold. Use a sentinel-controlled loop to determine when the program should stop looping and display the final results.

It is a java programming course and I am using eclipse as the coding program and I think I got most of the answer (or the code to do it) but I keep getting errors.

import java. util. Scanner; // program uses class Scanner
public class fiveseventeen
{
private String buyerName; // name of the purchaser
// int instance variables are initialized to 0 by default
private int total; // sum of purchase price
private int purchaseCounter; // number of purchases made
private int product1; // count of product 1 purchases
private int product2; // count of product 2 purchases
private int product3; // count of product 3 purchases
private int product4; // count of product 4 purchases
private int product5; // count of product 5 purchases
// constructor initializes productName
public fiveseventeen( String name )
{
buyerName = name;// intitializes productName
}// end contstructor
// method to set product name
public void setBuyerName( String name )
{
buyerName = name;// store the product name
}// end method setProductName
// method to return product name
public String getBuyerName()
{
return buyerName;
}// end method getProductName
// display a welcome message to the purchaser
public void displayMessage()
{
// getBuyerName gets name of purchaser
System. out. printf( "Hello, %s! Please select the products that you wish to purchase.", getBuyerName() );
}// end method displayMessage
// input arbitrary number for product selection from user
public void inputPurchase()
{
Scanner input = new Scanner(System. in);
int selection; // product entered by user
System. out. printf( "%s\n%s\n %s\n %s\n",
"Enter a product selection using an integer in range of 1-5.",
"Type end-of-line indicator complete purchase",
"On UNIX/Linux/Mac OS X type d then press Enter",
"On Windows type z then press Enter" );
// loop until user enters sentery
while( input. hasNext() )
{
selection = input. nextInt(); // read selection
total += selection; // add selection to total
++purchaseCounter; // increment number of selections
// call the method to increment appropriate counter
( selection );
}// end method inputPurchase
}
// add 1 to appropriate counter for specified counter
private void ( int selection )
{
// determine which product number was entered
switch( selection )
{
case 1: // selection was product1
++product1; // increment product1
break;
case 2: // selection was product2
++product2; // increment product2
break;
case 3: // selection was product3
++product3; // increment product3
break;
case 4: // selection was product4
++product4; // increment product4
break;
case 5: // selection was product5
++product5; // increment product5
break;
}// end switch
} // end method
// display a report based on the selections entered
public void displayPurchaseReport()
{
System. out. println( "\nPurchases this session: ");
// if user entered at leaset on grade...
if( purchaseCounter != 0 )
{
// calculate total of all products entered
double sum = (double) total + purchaseCounter;
// output summary of results
System. out. printf( "Total of the %d products enter is %d\n", purchaseCounter, total );
System. out. printf( "The total cost is %d\n", sum );
System. out. printf( "%s\n%s%d\n%s%d\n%s%d\n%s%d\n%s%d\n ",
"Number of each product purchased: ",
"Product 1: ", product1,
"Product 2: ", product2,
"Product 3: ", product3,
"Product 4: ", product4,
"Product 5: ", product5 );
} // end if
else // no product numbers were entered
System. out. println( "No products were entered" );
} // end method displayPurchaseReport
} // end class

In the " Scanner input = new Scanner(System. in); " I am getting some sort of an error and when I click on the message it gives me several "try this".
I don't really understand this program so any help would still help

thanks