How can I get characters in string using index but did not use charAt()?

Question

I'm writing a program in Java. They say to not use String functions - so how can I get characters in a String using the index but not using charAt()?

other question has answer but they all are using charAt()

I also want to get characters one by one using a loop.

are you using a 1, 0 enter keyboard? tell us what can you use? — ΦXocę 웃 Пepeúpa ツ, Jun 19 '17 at 13:09
you can also refer to: https://stackoverflow.com/questions/196830/what-is-the-easiest-best-most-correct-way-to-iterate-through-the-characters-of-a?noredirect=1&lq=1 — kyriakosSt, Jun 19 '17 at 13:19

score 2 · Accepted Answer · answered Jun 19 '17 at 13:19

There is a way not to use any String methods with java.text.CharacterIterator but you are not using indexes as well. I am not sure if this complies with your question.

CharacterIterator it = new StringCharacterIterator(yourString);
for(char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
  // do whatever you want with c
}

score 1 · Answer 2 · answered Jun 19 '17 at 13:19

1

Use StringBuilder like this.

StringBuilder sb = new StringBuilder(yourString);
for (int i = 0; i < sb.length(); ++i)
    System.out.println(sb.charAt(i));

answered Jun 19 '17 at 13:19

thanks for answer . but i want it did not use charAt(). – supun rajasinghe Jun 19 '17 at 14:09
@Tom @supunrajasinghe guys, this code *DOES NOT USE* `String.charAt()`. It uses `StringBuilder.charAt()` which is -technically- a different method. – kyriakosSt Jun 20 '17 at 10:08

How can I get characters in string using index but did not use charAt()?

2 Answers2