ConcurrentLinkedDeque peekLast() method in Java
The java.util.concurrent.ConcurrentLinkedDeque.peekLast() is an in-built method in Java which
retrieves the last element of this deque container without removing it. The function returns NULL if the deque is empty.
Syntax:
Conn_Linked_Deque.peekLast()
Parameters: The function does not accepts any parameter.
Return Values: The function returns the last element present in this deque and returns NULL when the deque is empty.
Below programs illustrate the use of peekLast() method:
Program 1: This program involves deque with Integer elements.
// Java Program Demonstrate peekLast()// method of ConcurrentLinkedDeque import java.util.concurrent.*; class ConcurrentLinkedDequeDemo { public static void main(String[] args) { ConcurrentLinkedDeque<Integer> cld = new ConcurrentLinkedDeque<Integer>(); cld.addFirst(12); cld.addFirst(110); cld.addFirst(55); cld.addFirst(76); // Displaying the existing LinkedDeque System.out.println("Elements in" + "the LinkedDeque: " + cld); // Displaying the last element System.out.println("Last Element in" + "the LinkedDeque: " + cld.peekLast()); }} |
Output:
Elements inthe LinkedDeque: [76, 55, 110, 12] Last Element inthe LinkedDeque: 12
Program 2: This program involves deque with String elements.
// Java Program Demonstrate peekLast()// method of ConcurrentLinkedDeque import java.util.concurrent.*; class ConcurrentLinkedDequeDemo { public static void main(String[] args) { ConcurrentLinkedDeque<String> cld = new ConcurrentLinkedDeque<String>(); cld.addFirst("GFG"); cld.addFirst("Gfg"); cld.addFirst("Lazyroar"); cld.addFirst("Geeks"); // Displaying the existing LinkedDeque System.out.println("Elements in" + "the LinkedDeque: " + cld); // Displaying the last element System.out.println("Last Element in" + "the LinkedDeque: " + cld.peekLast()); }} |
Output:
Elements inthe LinkedDeque: [Geeks, Lazyroar, Gfg, GFG] Last Element inthe LinkedDeque: GFG
Reference:https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#peekLast()
