What is the NavigableSet.pollLast() method in Java?
The NavigableSet.pollLast() method is present in the NavigableSet interface inside the java.util package. The pollLast() method is used to retrieve and remove the last element from the set and as the set is always in sorted format, it leads to the removal of the largest element in the set.
When we add the elements in the
NavigableSet, they get stored in a sorted form. If theNavigableSetis of string type, the elements get stored in lexical order irrespective of string length.
Parameter
The NavigableSet.pollLast() does not accept any parameters.
Return value
The NavigableSet.pollLast() method returns the last element in the set.
If the set is empty, it returns null.
Code
Let’s now have a look at the code below.
import java.util.NavigableSet;import java.util.TreeSet;class Main{public static void main(String[] args){NavigableSet<Integer> s = new TreeSet<Integer>();s.add(6);s.add(8);s.add(5);s.add(3);s.add(9);s.add(10);s.add(3);System.out.println("The removed element from the NavigableSet after using NavigableSet.pollLast() is: " + s.pollLast());}}
Explanation
-
In lines 1 and 2, we import the required packages and classes.
-
In line 4 we make a
Mainclass. -
In line 6, we make a
main()function. -
In line 8, we create a
TreeSetof Integer type. -
From lines 10 to 16, we add the elements into the
NavigableSetby using theadd()method. -
In line 18, we use the
NavigableSet.pollLast()method and display the removed value from the set with a message.
So, this is the way to use the NavigableSet.pollLast() method in Java.
