How to add or insert ' (single quotes) for every string in a list in which strings are separated by commas using Java

Question

I have a list as below

[url1,url2,url3,url4] 

This list will be based on multiple selection from drop down list of HTML. So list size i.e., lis

Answer 1

Also you can use Java8 built-in features for String concatenation and third-party libraries for wrapping each string in quotes.

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.MockitoJUnitRunner;
import org.springframework.util.StringUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.StringJoiner;

@RunWith(MockitoJUnitRunner.class)
public class StringJoinerTest {
    @Test
    public void testStringJoiner() {

        //init test data
        String s1 = "team1";
        String s2 = "team2";
        List teams = new ArrayList<>(2);
        teams.add(s1);
        teams.add(s2);

        //configure StringJoiner
        //when some values will be added to joiner it will return string started with prefix "(" an finished with suffix ")"
        //between prefix and suffix values will be separated with delimiter ", "
        StringJoiner teamNames = new StringJoiner(", ", "(", ")");
        //if nothing has been added to the joiner it will return  this value ('')
        teamNames.setEmptyValue("(\'\')");

        //fill joiner with data
        for (String currentString : teams) {
            //if you need to wrap each string in single quotes you can do this via org.apache.commons.lang3.StringUtils#wrap
            // or org.springframework.util.StringUtils#quote
            teamNames.add(StringUtils.quote(currentString));
        }

        System.out.println(teamNames.toString());
    }
}