ArrayList of Characters

Question

I want to create an ArrayList of character objects based off the characters in a string of letters. But, I can't seem to figure out how to fill that ArrayList to match the String. I've been trying to have it iterate through the string so that later, if I change the content of the string it'll adjust. Regardless, no matter what I do I'm getting some sort of syntax error.

Could anybody please guide me in the right direction? Thanks a bunch!

import java.util.ArrayList;
import java.text.CharacterIterator;   //not sure if this is necessary??

public class Test{

//main method

     String words = new String("HELLO GOODBYE!");
     ArrayList<Character> sample = new ArrayList<Character>();

     for(int i = 0; i<words.length(); i++){
         sample.add((char)Character.codePointAt(sample,i));
     }
}

char[] charArray = words.toCharArray();

Eran
– Eran

2014-07-13 00:46:27 +00:00
Commented Jul 13, 2014 at 0:46 — Eran
– Eran, Commented Jul 13, 2014 at 0:46
In your case sample.add(words.charAt(i)); should work

PM 77-1
– PM 77-1

2014-07-13 00:46:57 +00:00
Commented Jul 13, 2014 at 0:46 — PM 77-1
– PM 77-1, Commented Jul 13, 2014 at 0:46
would this still add them as character objects??

user3806226
– user3806226

2014-07-13 00:54:56 +00:00
Commented Jul 13, 2014 at 0:54 — user3806226
– user3806226, Commented Jul 13, 2014 at 0:54

Tony · Accepted Answer · 2014-07-13 01:02:03Z

16

In your case, words.charAt() is enough.

  import java.util.ArrayList;

  public class Test{

       String words = new String("HELLO GOODBYE!");
       ArrayList<Character> sample = new ArrayList<Character>();

       for(int i = 0; i<words.length(); i++){
           sample.add(words.charAt(i));
       }
  }

Read more: Stirng, Autoboxing

edited Jul 13, 2014 at 1:02

answered Jul 13, 2014 at 0:56

Tony

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1 Comment

user3806226 Over a year ago

Thank you! would this still be considered as adding character objects?

Infigon · Accepted Answer · 2022-07-22 16:25:23Z

1

This code adds all the characters in a character array to an ArrayList.

Character[] letters = {'a', 'b', 'c', ...};
List<Character> array = new ArrayList<Character>();
array.addAll(Arrays.asList(letters));

edited Jul 22, 2022 at 16:25

Infigon

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answered Jan 26, 2021 at 2:42

live-love

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1 Comment

Amit Verma Over a year ago

While this code may provide a solution to the question, it's better to add context as to why/how it works. This can help future users learn, and apply that knowledge to their own code. You are also likely to have positive feedback from users in the form of upvotes, when the code is explained.

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