I want to display the element in an arraylist, not the hashcode

Question

I am currently trying to display a csv file called "Haha2" using csv open in Java. Unfortunately when I print the arraylist I get the hashcode and not the numbers that are contained in the file.

I have tried the .get() method and the .toArray() and .toString methods but I am still only able to print out the hashcode.

Here's my code:

import au.com.bytecode.opencsv.*;
import java.io.*;
import java.util.*;

public class playlist{

   public static void main (String args()) throws IOException {

      CSVReader reader = new CSVReader(new FileReader("Haha2.asc"),';', '"',29);

      List <String[]> data = new ArrayList <String[]>();
      data = reader.readAll();

      System.out.println(data);
   }
}

You have to loop through all elements in data and then for each element you again have to loop for all elements in each String[]. — Harry Joy
– Harry Joy, Commented Aug 10, 2011 at 8:26

dogbane · Accepted Answer · 2011-08-10 08:35:15Z

4

Here is a one-liner which first converts the list to an array giving you an array-of-arrays and then calling Arrays.deepToString().

System.out.println(Arrays.deepToString(data.toArray()));

answered Aug 10, 2011 at 8:35

dogbane

276k77 gold badges407 silver badges415 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

JB Nizet · Accepted Answer · 2011-08-10 08:29:31Z

2

Either loop through your list and call Arrays.toString() on each of the array of Strings, or transform List<String[]> into List<List<String>>.

answered Aug 10, 2011 at 8:29

JB Nizet

694k94 gold badges1.3k silver badges1.3k bronze badges

Comments

Sean Patrick Floyd · Accepted Answer · 2011-08-10 08:31:15Z

1

Use Arrays.toString():

for( String[] array : data ) {
    System.out.println(Arrays.toString(data));
}

answered Aug 10, 2011 at 8:31

Sean Patrick Floyd

301k72 gold badges481 silver badges598 bronze badges

Comments

oliholz · Accepted Answer · 2011-08-10 08:29:03Z

0

iterate over the List and than over the array:

for( String[] array : data ) {
    for( String string : array ) {
        System.out.println(string);
    }
    System.out.println("---");
}

answered Aug 10, 2011 at 8:29

oliholz

7,5252 gold badges46 silver badges83 bronze badges

Comments

epoch · Accepted Answer · 2011-08-10 08:30:49Z

0

for (String[] arr : data) {
    System.out.println(java.util.Arrays.asList(arr));
    System.out.println("...");
}

answered Aug 10, 2011 at 8:30

epoch

16.7k5 gold badges50 silver badges72 bronze badges

Collectives™ on Stack Overflow

I want to display the element in an arraylist, not the hashcode

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related