Combine multiple strings into one JAVA

Question

I have a set of strings which want to combine into one String with all sentences separated with coma like (*.csv)

here is how it goes with me:

String dataContainer;

for(String tempString:setInput){
     String finalString = "," + tempString + "," ;   
}

This doesn't work with me :(
But it should do for Set ex:

Set<String> setInput = new TreeSet();
setInput.add("Dog");
setInput.add("Cat");
setInput.add("Mouse");

to produce the string:

,Dog,,Cat,,Mouse,

Answer 1

It is better to use StringBuilder

 StringBuilder sb= new StringBuilder();

for(String tempString:setInput){
   sb.append(",").append(tempString).append(",");   
 }