Java TreeMap.lowerKey(K key)

public K lowerKey(K key)

import java.util.TreeMap;
/*from   w  w  w. j  a  v a 2  s  . c  om*/
public class Main {
   public static void main(String[] args) {
      
      TreeMap<Integer, String>  treemap = new TreeMap<Integer, String> ();
      
      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "from java2s.com");
      
      // getting lower key  
      System.out.println("Checking lower key");
      System.out.println("Value is: "+ treemap.lowerKey(5));
   }    
}