Question

My requirement is to store the large chunk of data (String value) but i am confused which one is better to use. I only want to append the incoming data.

e.g. String str1 = "abc"
     String str2 = "123";
     String Str3 = "xyz"; 

 suppose i am appending/ adding to  (Sbuilder/SBuffer/ vector/ ArrayList)  
 one after another, 
         e.g.  str1, str2 str3    then output must be    "abc123xyz"
               str2, str1,str3    output must be         "123abcxyz"

Answer 1

Use StringBuilder and ArrayList

StringBuffer and Vector have thread synchronization that adds overhead (unless you need it, but even then there’s ways to add that to the newer classes)