Arrays and ArrayLists final project

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#1

Even with the video tutorial, I got stuck with the steps 7 and over on this exercise (you need Pro to get into this page).
https://www.codecademy.com/paths/introduction-to-android-with-java/tracks/java-arrays-and-loops/modules/learn-java-arrays-and-arraylists/projects/java-desert-island-playlist

The problem is: I was able to remove one song so that my playlist only has 5 songs, but I can’t fire all the subsequent steps correctly.

Steps 8-10 are all about swapping song a to song b and the song b is supposed to appear twice in the list; despite many tries my list still displays both songs a and b, instead of showing doubled song b.

import java.util.ArrayList;

class Playlist {
  
  public static void main(String[] args) {
    ArrayList<String> desertIslandPlaylist = new
    ArrayList<String>();

    desertIslandPlaylist.add("Ich bin nackt");
    desertIslandPlaylist.add("Younger Now");
    desertIslandPlaylist.add("99 Luftballoons");
    desertIslandPlaylist.add("Night on the Galactic Railroad");
    desertIslandPlaylist.add("My Heart Will Go On");
    desertIslandPlaylist.add("Despacito");

  System.out.println(desertIslandPlaylist);
  
  desertIslandPlaylist.remove("Younger Now");
  
  System.out.println(desertIslandPlaylist.size());

  int indexA = desertIslandPlaylist.indexOf("Despacito");
     int indexB = desertIslandPlaylist.indexOf("My Heart Will Go On");

  String tempA = "Despacito";

  desertIslandPlaylist.set(indexA, "My Heart Will Go On");

desertIslandPlaylist.remove("Younger Now");

System.out.println(desertIslandPlaylist.size());

  }
  
}

 java Playlist
[Ich bin nackt, Younger Now, 99 Luftballoons, Night on the Galactic Railroad, My Heart Will Go On, Despacito]
5
$ java Playlist
[Ich bin nackt, Younger Now, 99 Luftballoons, Night on the Galactic Railroad, My Heart Will Go On, Despacito]
5
$ java Playlist
[Ich bin nackt, Younger Now, 99 Luftballoons, Night on the Galactic Railroad, My Heart Will Go On, Despacito]
5

I think my code has some issues but I can’t identify them on my own. Any insights much appreciated.

#2

What happens when you print out the actual array after modifying it?

#3

It worked. The key was to printing the Array after each modification :slight_smile: Thank you so much for the tip.

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