TreeMap subMap() method in java

import java.util.SortedMap;
import java.util.TreeMap;
public class TreeMapSubMapFromKeyMethodExample
{
   public static void main(String[] args)
   {
      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
      SortedMap<Integer, String> sm = new TreeMap<Integer, String>();
      tm.put(18, "violet");
      tm.put(12, "red");
      tm.put(14, "violet");
      tm.put(16, "green");
      tm.put(20, "blue");
      System.out.println("Gett a portion of TreeMap: ");
      sm = tm.subMap(12, 18);
      System.out.println("Sub map values are: " + sm);
   }
}

import java.util.NavigableMap;
import java.util.TreeMap;
public class TreeMapSubMapMethodExample
{
   public static void main(String[] args)
   {
      TreeMap<Integer, String> tm = new TreeMap<Integer, String>();
      NavigableMap<Integer, String> nm = new TreeMap<Integer, String>();
      tm.put(18, "violet");
      tm.put(12, "red");
      tm.put(14, "violet");
      tm.put(16, "green");
      tm.put(20, "blue");
      System.out.println("Get a portion of TreeMap: ");
      nm = tm.subMap(12, true, 18, true);
      System.out.println("Sub map values are: " + nm);
   }
}