1

您将需要检查用户输入的四个参数是否为空白，因此您将执行与之前相同的操作，但要执行四次。

识别用户是否按下<enter>

您编写了一个 JAVA 程序，该程序创建了一个带有四个实例变量的 CD 对象，以及一个帮助您验证此输入的 CDException.java 类。到目前为止，您一直在将这些类与我的驱动程序类一起使用。现在是时候创建一个真正的驱动程序类来实现 CD 对象的 ArrayList。这是您的 LAST 计划的要求列表

  • 从用户那里读取艺术家姓名
  • 从用户那里读取专辑名称
  • 读取库存商品数量
  • 阅读专辑价格

您的程序应该继续从用户那里读取 CD 信息，直到用户在所有字段中的所有条目都是空白的。然后，您的程序将打印用户输入的所有“有效”CD 的列表。

我不断收到这样的错误

CDStore.java:12: error: cannot find symbol
Disk d;
^
symbol: class Disk
location: class CDStore

CDStore.java:61: error: cannot find symbol
catch(CDException cde){
^
symbol: class CDException
location: class CDStore

CDStore.java:67: error: cannot find symbol
for(int i = 0; i < CDShelf.length( ); i++){
^
symbol: method length()
location: variable CDShelf of type ArrayList

CDStore.java:68: error: cannot find symbol
d = (Disk)(CD.get(i));
^
symbol: class Disk
location: class CDStore

CDStore.java:68: error: cannot find symbol
d = (Disk)(CD.get(i));
^
symbol: method get(int)
location: class CD
5 errors

看起来我的驱动程序类没有与我的异常类链接。任何帮助将不胜感激如何摆脱这些错误！

import java.util.*;
import java.text.*;

public class CDStore{
        public static void main (String[ ] arg)throws Exception{

     String sArtist = "";
     String sAlbum = "";
     int inStock = 0;
     double dPrice = 0;
     String C = "";
     Disk d;
     int count = 0;
     boolean exit = false;


     Scanner reader = new Scanner (System.in);
     ArrayList CDShelf = new ArrayList( );

      do{
        try{
            System.out.print("What is the Artist name: ");
            sArtist = reader.nextLine( );
            reader = new Scanner(System.in);

            if(sArtist.length( ) < 1){
               exit = true;
         }

            System.out.print("What is the album name: ");
            sAlbum = reader.nextLine( );
            reader = new Scanner(System.in);

            if(sAlbum.length( ) < 1){
               exit = true;
         }
            System.out.print("What is the price: ");
            dPrice = reader.nextDouble( );
            reader = new Scanner(System.in);

            if(dPrice < 1){
               exit = true;
         }
            System.out.print("How many are in stock: ");
            inStock = reader.nextInt( );
            reader = new Scanner(System.in);
            d = new CD(sArtist, sAlbum, dPrice, inStock);

            if(inStock < 1){
               exit = true;
         }

            CD.add(d);
            count++;
            System.out.println(C.toString( ));
            System.out.println("=============================");
        }
        catch(InputMismatchException ime){
            System.out.println("You didnt do it");
        }
        catch(CDException cde){
            System.out.println(cde.getMessage( ));
        }
    }while(count < 3);

    System.out.println("This is what you entered");
    for(int i = 0; i < CDShelf.length( ); i++){
        d = (Disk)(CD.get(i));
        System.out.println(d.toString( ));
    }
    }
}
4

0 回答 0