java - 打印阵列

Question

好的，我正在尝试让文件扫描器返回数组 itemList。 但是，我不明白为什么每次我都会返回 itemList 并尝试使用 println 表单。 它返回:

[Ljava.lang.String;@3d3b5a3a

[Ljava.lang.String;@10cb42cf

[Ljava.lang.String;@482d59a3

[Ljava.lang.String;@18f42160

当我正在读取的文件包含类似内容

苹果10

鱼20

import java.io.*;
import java.util.*;

class loadInventory{  /*This class is used for loading the inventory */

private String[] itemList;  /*The lines of the inventory are stored in this array */
private int numItems;       /* The number of items is stored in this variable */

public loadInventory(String fileName){  /*We can do everything in the constructor. It gets the fileName from the superMarket
                                              object */

 itemList = new String[100];  /*We assume there are not more than 100 items in the inventory */
 numItems=0;                  /*initialize numItems to 0*/
                         /*Read the file using the try-catch block below. We are not specifically catching any exception.
                               We will not cover reading or writing of files and exceptions in this unit. So you 
                              don't need to understand this piece of code. */
 try{
     BufferedReader reader = new BufferedReader(new FileReader(fileName)); /*standard code for reading a file */
     String line = reader.readLine();        /*read the next line from the file and store in line */
     while (line != null){                  /*as long as there are lines */
          itemList[numItems]= line;         /*store the line in the current location of the array */
          numItems++;                       /*increment the number of items */
          line = reader.readLine();         /*read the next line */
       }

      reader.close();           /*close the reader */
   } catch (IOException e){     /*we don't catch any exception */
       }
       System.out.println(itemList);
  }

  public String[] getItemList() {
        return itemList;

    }


} 

Answer 1

打印实例数组，如下所示:

System.out.println(Arrays.toString(itemList));