troubleshooting Question

string challenge middle characters

Avatar of gudii9
gudii9Flag for United States of America asked on
Programming Languages-OtherJavaJava EE
5 Comments2 Solutions314 ViewsLast Modified:
Hi,

I am working on below coding challenge
http://codingbat.com/prob/p137729
i wrote as below
public String middleTwo(String str) {
  int len=str.length();
 
  if(len%2==0){
  return str.substring((len/2)-1,(len/2)+1);
  }
  return "";
}


My test cases are passing
i would like to know how can improve on my above code. For string odd length  i returned "". Not sure if that is what challenge is expecting me to do.Please advise.Thanks in advance
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