Java tutorial
import java.util.Map.Entry; import java.util.NavigableMap; import java.util.TreeMap; public class Main { public static void main(String[] args) { NavigableMap<String, String> nMap = new TreeMap<>(); nMap.put("CSS", "style"); nMap.put("HTML", "mark up"); nMap.put("Oracle", "database"); nMap.put("XML", "data"); System.out.println("Navigable Map:" + nMap); Entry<String, String> lowerXML = nMap.lowerEntry("XML"); Entry<String, String> floorXML = nMap.floorEntry("XML"); Entry<String, String> higherXML = nMap.higherEntry("XML"); Entry<String, String> ceilingXML = nMap.ceilingEntry("XML"); System.out.println("Lower:" + lowerXML); System.out.println("Floor:" + floorXML); System.out.println("Higher:" + higherXML); System.out.println("Ceiling:" + ceilingXML); // Get the reverse order view of the map NavigableMap<String, String> reverseMap = nMap.descendingMap(); System.out.println("Navigable Map(Reverse Order):" + reverseMap); } }