使用ListIterator打印数组列表

Question

我正在尝试使用ListIterator从ArrayList打印,我很确定我做错了因为它不起作用但我不知道如何解决它.所有抓住零件编号的线路都不起作用,不确定原因; P.总是赞赏任何帮助:).

package invoice;
import static java.lang.System.out;

import java.util.*;

public class InvoiceTest {


    public static void print(){

    }

    public static void main (String args[]) {

        Scanner imput = new Scanner (System.in);
        ArrayList lInvoice = new ArrayList() ;
        int counter = 0;
        int partCounter;

        out.println("Welcome to invoice storer 1.0!");
        out.println("To start please enter the number of items: ");
        partCounter = imput.nextInt();


        while (counter < partCounter){
            counter++;
            out.println("Please enter the part number:");   
            Invoice invoice1 = new Invoice(); //Makes invoice 1 use the invoice class
            String partNumber = imput.nextLine();// sets part number to the next imput
            //invoice1.setPartNumber(partNumber);// Sets it to the private variable in invoice.java
            lInvoice.add(partNumber);

            out.println("Please enter in a discription of the part: ");
            String partDis = imput.nextLine();
            //invoice1.setPartDis(partDis);
            lInvoice.add(partDis);

            out.println ("Please enter the number of items purchased: ");
            int quanity = imput.nextInt();
            //invoice1.setQuanity(quanity);
            lInvoice.add(quanity);

            out.println ("Please enter the price of the item:");
            double price = imput.nextDouble();
            //invoice1.setPrice(price);
            lInvoice.add(price);

        }

        ListIterator<String> ltr = lInvoice.listIterator();
        while(ltr.hasNext());
        out.println(ltr.next());
    }
}

Answer 1

您的程序中还有一些其他错误.

首先,你要为你的类型添加一个类型ArrayList.既然你想添加int,double并且String,我建议你创建一个ArrayList<Object> lInvoice = new ArrayList<Object>() ;

然后用你的迭代器循环:

ListIterator<Object> ltr = lInvoice.listIterator();
       while(ltr.hasNext()){
           out.println(ltr.next()); 
       }