Java Join Strings with Comma Separator

If you have a list of multiple Strings and you want to join them with a comma separator,

Example 1: Using Java 8 StringJoiner

import java.util.StringJoiner;

public class JavaStringJoinWithComma {
    public static void main(String[] args) {
        
        String string1 = "One";
        String string2 = "Two";
        String string3 = "Three";

        StringJoiner stringJoiner = new StringJoiner(",");
        stringJoiner.add(string1).add(string2).add(string3);
        System.out.println(stringJoiner.toString());
       
    }
}

Output:

One,Two,Three

Example 2: Using Java 8 String.join() method

public class JavaStringJoinWithComma {
    public static void main(String[] args) {
        
        String string1 = "One";
        String string2 = "Two";
        String string3 = "Three";

        String joinedString = String.join(",", string1,string2,string3);
        System.out.println(joinedString);
       
    }
}

One,Two,Three

Example 3: Using Java 8 Stream and Collectors

import java.util.ArrayList;
import java.util.stream.Collectors;

public class JavaStringJoinWithComma {
    public static void main(String[] args) {
        
        String string1 = "One";
        String string2 = "Two";
        String string3 = "Three";

        ArrayList<String> arrayList = new ArrayList<>();
        arrayList.add(string1);
        arrayList.add(string2);
        arrayList.add(string3);

        String joinedString = arrayList.stream().collect(Collectors.joining(","));
        System.out.println(joinedString);
       
    }
}

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