我已经非常完成这个程序,除了当我设置一个价格或数量对象为负数时,它不会设置为0.方向说如果价格不是一个正数应该设置为0.0,如果数量不是正数,它应该设置为0.这里是我的代码,任何人都可以告诉我我哪里出错了。Java发票程序 - 将数量设置为0设置价格为0.0
这次演习是3.12发票类形式的Deitel第10版如何编程:
public class Invoice {
private String partNumber;
private String partDescription;
private int quantity;
private double priceperitem;
private double amount;
public Invoice(String number, String partDescription, int quantity, double price)
{
this.partNumber = number;
this.partDescription = partDescription;
this.quantity = quantity;
this.priceperitem = price;
}
public void setPartNumber(String number)
{
partNumber = number;
}
public String getPartNumber()
{
return partNumber;
}
public void setPartDescription (String description)
{
partDescription = description;
}
public String getPartDescription(){
return partDescription;
}
public void setQuantity(int count){
if(count > 0)
quantity = 0;
}
public int getQuantity(){
return quantity;
}
public void setPrice (double price){
if(price > 0.0)
priceperitem = price;
if(price < 0.0)
priceperitem = 0.0;
}
public double getPrice(){
return priceperitem;
}
public double getInvoiceAmount(){
amount = getQuantity() * getPrice();
return amount;
}
}
import java.util.Scanner;
public class InvoiceTest {
public static void main(String[] args) {
int quantity;
double price;
double invoiceAmount;
Invoice invoice1 = new Invoice("1234","Hammer",-5, -39.75);
Scanner keyboard = new Scanner (System.in);
System.out.printf("Part number: %s\n", invoice1.getPartNumber());
System.out.printf("Part Description: %s\n", invoice1.getPartDescription());
System.out.printf("Quantity: %s\n", invoice1.getQuantity());
System.out.printf("Price: %s\n", invoice1.getPrice());
}
}