Get floor key from NavigableMap in Java

Java 8Object Oriented ProgrammingProgramming

To get floor key means to return the greatest key less than or equal to the given key, or null if there is no such key. This can be done with the floorKey() metho.

The following is an example to get floor key from NavigableMap


 Live Demo

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      NavigableMap<String, Integer> n = new TreeMap<String, Integer>();
      n.put("A", 498);
      n.put("B", 389);
      n.put("C", 868);
      n.put("D", 988);
      n.put("E", 686);
      n.put("F", 888);
      n.put("G", 999);
      n.put("H", 444);
      n.put("I", 555);
      n.put("J", 666);
      System.out.println("NavigableMap elements...\n"+n);
      System.out.println("Floor Key = "+n.floorKey("C"));


NavigableMap elements...
{A=498, B=389, C=868, D=988, E=686, F=888, G=999, H=444, I=555, J=666}
Floor Key = C
Published on 17-Jan-2019 10:28:38