Java - Convert a ArrayList to coma separated strings with double quotes around each string

Question

I am trying to convert a string arrayList to comma separated strings with double quotes around each string. I can write the code, But looking for any existing utility methods out there like apache StringsUtil.

my expected output is like "string1","string2","string3"

Answer 1

String output ="";

for(int i = 0; i < arraylist.size(); i++){ output+="\\""+arraylist.get(i)+"\\""+i==arraylist.size()-1?"":","; }

Or

String str = "\\""+StringUtils.join(arraylist.toArray(new String[0]),"\\",\\"")+"\\"";

Answer 2

use StringBuilder instead to be more efficient, the problem with the previous answer is that it does string concatenation which, in certain cases, with certain types of strings, with certain quantity of concatenations, is going to be inefficient.

Instead, keep .append()'ing the elements you need and do a .toString() at the end.