troubleshooting Question

java string challenge issue

Avatar of gudii9
gudii9Flag for United States of America asked on
Programming Languages-OtherJavaJava EE
43 Comments4 Solutions357 ViewsLast Modified:

I tried below example

I wrote like below
public String nonStart(String a, String b) {
StringBuilder sb1=null;
String aFirst=null;
String bFirst=null;
  return aFirst+bFirst;
  return null;
it is pasing some and failing in some test cases

Expected	Run		
nonStart("Hello", "There") → "ellohere"	"ellohere"	OK	    
nonStart("java", "code") → "avaode"	"avaode"	OK	    
nonStart("shotl", "java") → "hotlava"	"hotlava"	OK	    
nonStart("ab", "xy") → "by"	"by"	OK	    
nonStart("ab", "x") → "b"	"null"	X	    
nonStart("x", "ac") → "c"	"null"	X	    
nonStart("a", "x") → ""	"null"	X	    
nonStart("kit", "kat") → "itat"	"itat"	OK	    
nonStart("mart", "dart") → "artart"	"artart"	OK	    
other tests
please advise on how to fix and improve my code. thanks in advance
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