2-index string

import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;

public class StringList {
  public static void main(String[] args) {
    String[] s = {"ABC", "DEF", "GHI"};

    Map<Integer, Map<Integer, String>> map =
      new TreeMap<Integer, Map<Integer, String>>();
    map.put(0, new TreeMap<Integer, String>());
    for (int i = 0; i < s.length; i++)
      map.get(0).put(i, s[i]);

    s[2] = "222";

    for (String e: s)
      System.out.println(e);

    for (Entry<Integer, Map<Integer, String>> e: map.entrySet())
      for (Entry<Integer, String> ee: e.getValue().entrySet())
        System.out.println(ee.getValue());
  }
}