Java > String-2 > doubleChar (CodingBat Solution)

Problem:

Given a string, return a string where for every char in the original, there are two chars.

doubleChar("The") → "TThhee"
doubleChar("AAbb") → "AAAAbbbb"
doubleChar("Hi-There") → "HHii--TThheerree"

Solution:

public String doubleChar(String str) {
  int len = str.length();
  String new_str = "";
  for (int i = 0; i < len; i++) {
    new_str += str.substring(i,i+1) + str.substring(i, i+1);
  }
  return new_str;
}

6 comments:

  1. UnknownApril 6, 2018 at 2:16 PM

    public String doubleChar(String str) {
    String newString = "";
    for(int i=0; i<str.length(); i++){
    newString = newString + str.charAt(i)+str.charAt(i);
    }
    return newString;
    }

    ReplyDelete
  2. AnonymousSeptember 13, 2020 at 4:16 PM

    public String doubleChar(String str) {
    return (str.isEmpty())? "": "" + str.charAt(0) + str.charAt(0) +doubleChar(str.substring(1));
    }

    ReplyDelete
  3. AnonymousSeptember 13, 2020 at 4:17 PM

    public String doubleChar(String str) {
    if(str.isEmpty()){
    return ""
    }
    return str.charAt(0) + str.charAt(0) +doubleChar(str.substring(1));
    }

    ReplyDelete
  4. AnonymousSeptember 13, 2020 at 4:18 PM

    public String doubleChar(String str) {
    if(str.isEmpty()){
    return "";
    }
    return "" + str.charAt(0) + str.charAt(0) +doubleChar(str.substring(1));
    }

    ReplyDelete
  5. AnonymousSeptember 13, 2020 at 4:27 PM

    public String doubleChar(String str) {
    if(str.isEmpty()){
    return "";
    }
    return "" + str.charAt(0) + str.charAt(0) +doubleChar(str.substring(1));
    }

    ReplyDelete
  6. AnonymousSeptember 13, 2020 at 4:28 PM

    public String doubleChar(String str) {
    return (str.isEmpty())?
    str:
    "" + str.charAt(0) + str.charAt(0) +doubleChar(str.substring(1));
    }

    ReplyDelete