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import java.util.Scanner ;
public class Test
{
public static void main(String[] args)
{
double price = 0 ;
double amount = 0 ;
Invoice invoice = new Invoice() ;
Scanner input = new Scanner(System.in) ;
System.out.print("please input price:");
price = input.nextDouble() ;
invoice.setPrice(price) ;
System.out.print("please input amount:");
amount = input.nextDouble() ;
invoice.setAmount(amount) ;
System.out.println("invoice.getInvoiceamount():" + invoice.getInvoiceamount() );
}
}