JAVA

java join list

List<String> list = Arrays.asList("foo", "bar", "baz");
String joined = String.join(" and ", list); // "foo and bar and baz"

java join list as string

List<String> list = Arrays.asList("a","b","c");
String result = String.join(",", list);

System.out.println(result);		//prints a,b,c

java join two list

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

public class JoinLists {

    public static void main(String[] args) {

        List<String> list1 = new ArrayList<String>();
        list1.add("a");

        List<String> list2 = new ArrayList<String>();
        list2.add("b");

        List<String> joined = new ArrayList<String>();

        joined.addAll(list1);
        joined.addAll(list2);

        System.out.println("list1: " + list1);
        System.out.println("list2: " + list2);
        System.out.println("joined: " + joined);

    }
}
//output
list1: [a]
list2: [b]
joined: [a, b]

join elements in a list with , java

Joiner joiner = Joiner.on("+");
String join = joiner.join(joinList);

java join list

String[] data = { "First", "Second", "Third" };
StringBuilder sb = new StringBuilder();
for (String item : data) {
  sb.append(item).append(", ");
}
sb.setLength(sb.length() - 2);

// generates output:
// First, Second, Third