import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
public class Main {
public static void main(String[] argv) throws Exception {
List stuff = Arrays.asList(new String[] { "a", "b" });
List list = new ArrayList(stuff);
List list2 = new LinkedList(list);
Set set = new HashSet(stuff);
Set set2 = new TreeSet(set);
Map map = new HashMap();
Map map2 = new TreeMap(map);
}
}