TreeMap floorKey() method in java
import java.util.TreeMap; public class TreeMapFloorkeyExample { public static void main(String[] args) { TreeMap<Integer, String> tm = new TreeMap<Integer, String>(); tm.put(60, "apple"); tm.put(10, "banana"); tm.put(50, "cherry"); tm.put(30, "fig"); tm.put(80, "grape"); tm.put(90, "kiwifruit"); // printing values of TreeMap System.out.println("TreeMap: " + tm); try { // passing null as parameter to floorKey() method System.out.println(tm.floorKey(null)); } catch(Exception ex) { System.out.println("Exception: " + ex); } } }