troubleshooting Question

java challenge string builder

Avatar of gudii9
gudii9Flag for United States of America asked on
Programming Languages-OtherJavaJava EE
19 Comments3 Solutions548 ViewsLast Modified:

I am working on below coding challenge
i wrote as below

public String left2(String str) {
  StringBuilder sb1=new StringBuilder();
  StringBuilder sb2=new StringBuilder();
  StringBuilder sb3=new StringBuilder();
  String result=null;
   String str1=null;
    String str2=null;
  //for(int i=0;i<str.length();i++){
  return result;

My test cases are passing.
i would like to know how can improve on my above code. How to use string builder in this case Please advise.Thanks in advance
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