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Thread: Trouble with getting middle characters from a string.

  1. #1
    Junior Member
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    Default Trouble with getting middle characters from a string.

    Can someone please help and tell me what i am doing wrong that makes my first test input fail? When the "hello" is entered it is only to return "l" but with my program it returns "llo". Below is my code and the test results.

    My Code

    public*class*MiddleTest
    {
    ***/**
    ******Gets*the*middle*character*or*character*pair* from*this*string*
    ******when*possible.
    ******@param*str*a*string
    ******@return*the*middle*character*(if*the*string* length*is*odd)*or
    ******the*middle*two*characters*(if*it*is*even),*o r*the*empty*string*if*str*is
    ******empty.
    ****/
    ***public*static*String*getMiddle(String*str)
    ***{
    ****
    *****if*((str.length()*%*2)*==*0)
    *{
    *//Even*length
    **if*(str.length()*>*2)
    ***{
    *return*str.substring(*str.length()*/*2*-*1,*str.length()*/*2*+1);
    ***}
    *}
    *//Odd*length
    *return*str.substring(str.length()*/*2);
    ***}
    }

    Test Results

    Parameters Actual Return Expected Return Outcome
    hello llo l fail
    help el el pass
    l l l pass
    pass


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Trouble with getting middle characters from a string.

    Please edit your post and remove the *s and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.

    Read the API doc for the String class's substring method to see how to use it to return what you want.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Help with getting the middle characters of a string!

    I am having a problem getting my first test result to work (which you can see below). When the string is "hello" it returns "llo" instead of "l". What is wrong in my code that is causing this to happen? My code and test results are as follows:

    My code:

     
    public class MiddleTest
    {
       /**
          Gets the middle character or character pair from this string 
          when possible.
          @param str a string
          @return the middle character (if the string length is odd) or
          the middle two characters (if it is even), or the empty string if str is
          empty.
       */
       public static String getMiddle(String str)
       {
     
         if ((str.length() % 2) == 0)
    	 {
    	 //Even length
    	  if (str.length() > 2)
    	   {
    	 return str.substring( str.length() / 2 - 1, str.length() / 2 +1);
    	   }
    	 }
    	 //Odd length
    	 return str.substring(str.length() / 2);
       }
    }

    Test Results

    Test Results

    Parameters Actual Expected Outcome
    hello llo l fail
    help el el pass
    l l l pass
    pass

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