LinkedBlockingDeque peekLast() method in Java
The peekLast() method of LinkedBlockingDeque returns the last element in the Deque container, but does not deletes it. It returns null if the container is empty.
Syntax:
public E peekLast()
Parameters: This method does not accept any parameters.
Returns: This method returns last element in the Deque container if the container is not empty. It returns false if the container is empty.
Below programs illustrate peekLast() method of LinkedBlockingDeque:
Program 1:
// Java Program Demonstrate peekLast()// method of LinkedBlockingDeque  import java.util.concurrent.LinkedBlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)      {          // create object of LinkedBlockingDeque        LinkedBlockingDeque<Integer> LBD            = new LinkedBlockingDeque<Integer>();          // Add numbers to end of LinkedBlockingDeque        LBD.addFirst(7855642);        LBD.addFirst(35658786);        LBD.addFirst(5278367);        LBD.addFirst(74381793);          // Print the queue        System.out.println("Linked Blocking Deque: " + LBD);          System.out.println("Front element in Deque: " + LBD.peekLast());    }} |
Output:
Linked Blocking Deque: [74381793, 5278367, 35658786, 7855642] Front element in Deque: 7855642
Program 2:
// Java Program Demonstrate peekLast()// method of LinkedBlockingDeque// when Deque is empty  import java.util.concurrent.LinkedBlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)      {          // create object of LinkedBlockingDeque        LinkedBlockingDeque<Integer> LBD            = new LinkedBlockingDeque<Integer>();          // Add numbers to end of LinkedBlockingDeque        LBD.add(7855642);        LBD.add(35658786);        LBD.add(5278367);        LBD.add(74381793);          // Print the queue        System.out.println("Linked Blocking Deque: " + LBD);          // empty deque        LBD.clear();          System.out.println("Front element in Deque: " + LBD.peekLast());    }} |
Output:
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793] Front element in Deque: null
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#peekLast()
