import java.util.ArrayList;
import java.util.List;
public class MyClass {
public static void main(String args[]) {
List<Character> charsList = new ArrayList<Character>();
charsList.add('j');
charsList.add('a');
charsList.add('v');
charsList.add('a');
StringBuilder sb = new StringBuilder(charsList.size());
for (Character ch : charsList) {
sb.append(ch);
}
String s = sb.toString();
System.out.println(s);
}
}
/*
run:
java
*/