java - 数组列表。总价 打印出来

Question

import java.util.Scanner;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;


import java.util.*;


class ReceiptCode {
private static final char[] ItemPrice = null;

    public static void main(String[] args) {
    // TODO Auto-generated method stub
    //Font f = new Font("Calibri", Font.BOLD, 20);

    @SuppressWarnings("resource")
    Scanner scan= new Scanner(System.in);
    System.out.println("Enter Company Name");
    String companyName= scan.nextLine();

    System.out.println("Enter STREET ADDRESS");
    String street=scan.nextLine();

    System.out.println("Enter CITY, STATE, ZIP");
    String CSZ=scan.nextLine();

    //System.out.println(companyName + "\n" + street + "\n" + CSZ);


    String breaker = "------------------------------";
    List <Items> invList = new ArrayList<Items>();
    System.out.println("How many items did you order?");
    int counter = scan.nextInt();
    double totalPrice = 0;
    for (int i=0; i<counter; i++)
    {
        System.out.println("Enter Item Name");
        String fName = scan.next();
        System.out.println("Enter Quantity?");
        int fType = scan.nextInt();
        System.out.println("Enter Price?");
        double fPrice = scan.nextDouble();
        Items inv = new Items(fName, fType, fPrice);
        double x = (fType * fPrice);
        totalPrice += x;
        invList.add(inv);
        //System.out.println(totalPrice);
    }

    DateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy");
    DateFormat timeFormat = new SimpleDateFormat ("HH:mm");
    Date date = new Date();
    Date time = new Date();
    System.out.printf("%-15s %n", companyName);
    System.out.printf("%-15s %14s %n",street + "\n" + CSZ,dateFormat.format(date));
    System.out.printf("%-15s %n", timeFormat.format(time));
    System.out.println(breaker);
    for (Items c : invList) {

        System.out.println (c.getItemQTY() + " x " + c.getItemName() + " : " +       c.getItemPrice() + "$");
           System.out.println (breaker);

}   
}
}



public class Items {

    private String ItemName;
    private int ItemQTY;
    private double ItemPrice;

public Items (String fdType, int fdAmount, double fdPrice)
{
    ItemName = fdType;
    ItemQTY = fdAmount;
    ItemPrice = fdPrice;
}
public String getItemName()
{
    return ItemName;
}
public int getItemQTY()
{
    return ItemQTY;
}
public double getItemPrice()
{
    return ItemPrice;
}
    }

我有几个问题。

1. 如何才能得到最后打印出来的所有商品的总价？
2. 如何将该价格乘以固定百分比？(税费)
3. 如何将收据格式打印到物理打印机上。

任何帮助都会很棒!你们是最棒的!

Answer 1

1. 您可以在 ReceiptCode 类中设置总价字段。通过实现适当的 setter 和 getter，您可以获得总价。
2. 完成第一步后，将价格乘以税费。

3. 采用PrintService界面。例如:

   PrintService selectedPrinter = (PrintService) 选择；DocPrintJob printJob = selectedPrinter.createPrintJob();

有关更多详细信息，请查看 Java: Printing program output to a physical printer发布。