The lastKey() method of SortedMap interface in Java is used to return the last or the greatest key currently in this map.
Syntax:
K lastKey()
Where, K is the type of key maintained by this Set.
Parameters: This function does not accepts any parameter.
Return Value: It returns the last or the greatest key currently in this map
Exception: It throws NoSuchElementException, if this map is empty.
Below programs illustrate the above method:
Program 1:
// A Java program to demonstrate// working of SortedSetimport java.util.*; public class Main { public static void main(String[] args) { // Create a TreeSet and inserting elements SortedMap<Integer, String> mp = new TreeMap<>(); // Adding Element to SortedSet mp.put(1, "One"); mp.put(2, "Two"); mp.put(3, "Three"); mp.put(4, "Four"); mp.put(5, "Five"); // Returning the last key from the map System.out.print("Last Key in the map is : " + mp.lastKey()); }} |
Output:
Last Key in the map is : 5
Program 2:
// A Java program to demonstrate// working of SortedSetimport java.util.*; public class Main { public static void main(String[] args) { // Create a TreeSet and inserting elements SortedMap<String, String> mp = new TreeMap<>(); // Adding Element to SortedSet mp.put("One", "Geeks"); mp.put("Two", "For"); mp.put("Three", "Geeks"); mp.put("Four", "Code"); mp.put("Five", "It"); // Returning the last key from the map System.out.print("Last Key in the map is : " + mp.lastKey()); }} |
Output:
Last Key in the map is : Two
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/SortedMap.html#lastKey()
