Java > String-1 > twoChar (CodingBat Solution)

Problem:

Given a string and an index, return a string length 2 starting at the given index. If the index is too big or too small to define a string length 2, use the first 2 chars. The string length will be at least 2.

twoChar("java", 0) → "ja"
twoChar("java", 2) → "va"
twoChar("java", 3) → "ja"


Solution:

public String twoChar(String str, int index) {
  if (str.length() <= index + 1 || index < 0)
    return str.substring(0,2);
  else
    return str.substring(index, index + 2);
}


8 comments :

  1. This is v helpful thank uuuuuuu :-)

    ReplyDelete
  2. Mine included more of the unnecessary. Thank you for this one!

    public String twoChar(String str, int index) {
    if (index != str.length()) {
    return str.substring(0,2);
    }else{
    return str.substring(index, index+2);
    }
    }

    ReplyDelete
    Replies
    1. Please delete this one it is incorrect!

      Delete
    2. This one is ok.

      public String twoChar(String str, int index) {
      if (index == str.length()-1 ||
      index < 0 ||
      index >= str.length()) {
      return str.substring(0,2);
      }else{
      return str.substring(index, index+2);
      }
      }

      Delete
  3. public String twoChar(String str, int index) {
    return index+1=0?str.substring(index,index+2):str.substring(0,2);
    }
    // 😀

    ReplyDelete
    Replies
    1. public String twoChar(String str, int index) {
      return index+1=0?str.substring(index,index+2):str.substring(0,2);
      }
      // 😀

      Delete
    2. public String twoChar(String str, int index) {
      return index+1=0?str.substring(index,index+2):str.substring(0,2);
      }

      Delete

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