SortedMap lastKey() method in Java (original) (raw)

Last Updated : 26 Nov, 2018

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 mapException: It throws NoSuchElementException, if this map is empty. Below programs illustrate the above method:Program 1:

Java `

// A Java program to demonstrate // working of SortedSet import 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:

Java `

// A Java program to demonstrate // working of SortedSet import 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()