A List keeps it elements in the order in which they were added. : List « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. List

ArrayList, extends AbstractList, is roughly equivalent to the Vector class. 

ArrayList can expand as needed. 
ArrayList does not use synchronized methods.
ArrayList is somewhat faster than Vector.



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

public class MainClass {
  public static void main(String[] argv) {
    List<String> list = new ArrayList<String>();
    list.add("a");
    list.add("b");
    list.add("c");

    for (String s : list) {
      System.out.println(s);
    }
  }
}

a
b
c