How to split a string every 2 characters?

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6

I’m trying to split a string every two characters, but I don’t have a delimiter and I need to use the whole string.

Example:

String exemplo= 99E65A78

String ex1= 99
String ex2= E6
String ex3= 5A
String ex4= 78
java string

4 answers

6

I would do so:

import java.util.*;

public class Program {
    public static void main (String[] args) {
        String texto = "99E65A78";
        List<String> partes = new ArrayList<String>();
        for (int i = 0; i < texto.length(); i += 2) partes.add(texto.substring(i, Math.min(i + 2,texto.length())));
        for (int i = 0; i < partes.size(); i++) System.out.println(partes.get(i));
    }
}

See working on ideone. And in the repl it.. Also put on the Github for future reference.

I skip every 2 characters and keep it in a list. I just take care not to catch a character smaller than the size.

The second loop is just for show.

There are other ways to do it, but this should be the most performative and it’s very simple.

  • I would only exchange the 2 for a constant, in case it wants to vary by n characters, would have to change only in a corner. (:

  • 1

    @Felipeavelar I even thought about it and I really like the idea, I just found exaggeration to demonstrate here. I’m still going to take a look at it and I’m going to move on it too (I need to optimize time these days).

  • Thanks. Thank you very much.

3

Another way would be to use a while:

String text = "99E65A78"
List<String> stringSerparada = new ArrayList<String>();
int index = 0;
while (index < text.length()) {
      stringSerparada.add(text.substring(index, Math.min(index+2,text.length()));
      index+= 2;
}

  • I think you lost the timing...

  • 1

    It’s true @Jeffersonquesado while doing it posted kkk

  • I thought it was the same answer, now that I realize you used while, so it’s slightly distinct...

1


Try it like this:

System.out.println(Arrays.toString(
    "8S8Q4D1SKCQC2C4S6H4C6DJS2S1C6C".split("(?<=\\G.{2})")
));

  • Solved. Thank you very much!!

  • 2

    Could you explain what the regex is doing.

  • 1

    You solve the problem but do not explain the solution. This does not contribute to solving the doubts of younger people in the area.

1

If you’re doing it in java. You can use "substring". I did it manually, but you can create a delimiter using a loop and work on it.

Ex:

    String texto = "99E65A78";
    String EX = "";

    EX = texto.substring(0, 2);
    System.out.println(EX);
    EX = texto.substring(2, 4);
    System.out.println(EX);
    EX = texto.substring(4, 6);
    System.out.println(EX);
    EX = texto.substring(6, 8);
    System.out.println(EX);
  • 1

    And if the string size cannot be determined?

  • 1

    @Articuno , why the AR put as a note in the text "using loop repetition", near the observation "I did manually, however"

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