TreeSet pollLast() method in Java with Example

The pollLast() method of Java.util.concurrent.TreeSet is an in-built function in Java which returns retrieves and removes the last (highest) element, or returns null if this set is empty.

Syntax:

public E pollLast()

Return Value: The function returns retrieves and removes the last (highest) element, or returns null if this set is empty.

Below programs illustrate the TreeSet.pollLast() method:

Program 1:

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// Java program to demonstrate pollLast()
// method of TreeSet
  
import java.util.*;
  
class TreeSetpollLastExample1 {
    public static void main(String[] args)
    {
        // Creating a set object
        TreeSet<Integer> set
            = new TreeSet<Integer>();
  
        // Adding elements to this set
        for (int i = 10; i <= 50; i += 10)
            set.add(i);
  
        // Printing the content of the set
        System.out.println("Contents of the set: " + set);
  
        // Retrieving and removing Last element of the set
        System.out.println("The Last element of the set: "
                           + set.pollLast());
  
        // Printing the content of the set after pollLast()
        System.out.println("Contents of the set after pollLast: "
                           + set);
    }
}

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Output:

Contents of the set: [10, 20, 30, 40, 50]
The Last element of the set: 50
Contents of the set after pollLast: [10, 20, 30, 40]

Program 2:

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// Java program to demonstrate pollLast()
// method of TreeSet
  
import java.util.*;
  
class TreeSetpollLastExample2 {
    public static void main(String[] args)
    {
        // Creating a set object
        TreeSet<Integer> set
            = new TreeSet<Integer>();
  
        // Printing the content of the set
        System.out.println("Contents of the set: "
                           + set);
  
        // Retrieving and removing Last element of the set
        System.out.println("The Last element of the set: "
                           + set.pollLast());
    }
}

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Output:

Contents of the set: []
The Last element of the set: null


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