I have Set<String> result
& would like to convert it to comma separated string. My approach would be as shown below, but looking for other opinion as well.
List<String> slist = new ArrayList<String> (result);
StringBuilder rString = new StringBuilder();
Separator sep = new Separator(", ");
//String sep = ", ";
for (String each : slist) {
rString.append(sep).append(each);
}
return rString;
This question is related to
java
string
list
collections
set
From Apache Commons library:
import org.apache.commons.lang3.StringUtils
Use:
StringUtils.join(slist, ',');
Another similar question and answer here
The Separator
you are using is a UI component. You would be better using a simple String sep = ", "
.
You could count the total length of the string first, and pass it to the StringBuilder constructor. And you do not need to convert the Set first.
Set<String> abc = new HashSet<String>();
abc.add("A");
abc.add("B");
abc.add("C");
String separator = ", ";
int total = abc.size() * separator.length();
for (String s : abc) {
total += s.length();
}
StringBuilder sb = new StringBuilder(total);
for (String s : abc) {
sb.append(separator).append(s);
}
String result = sb.substring(separator.length()); // remove leading separator
Source: Stackoverflow.com