android java StringBuilder list to string

/**
 * @author lautturi.com
 * Java example: android list to string
 */

import java.util.*;
import java.time.*;
import java.time.format.*;

public class Lautturi {

	public static void main(String[] args) {
		
		ArrayList<String> data = new ArrayList<String>();
		data.add("hello");
		data.add("lautturi");
		data.add("java");
		data.add("world");
	
		String item = data.get(2); // get the 3rd element of the list
		StringBuilder sb = new StringBuilder();
		for (String item1 : data) {
		  sb.append(item1).append(", ");
		}
		sb.setLength(sb.length() - 1);
		
		System.out.println("String:"+sb);
	}

}

output:

String:hello, lautturi, java, world,

to remove the last comma(,), set length of StringBuilder:

sb.setLength(sb.length() - 2);