ArrayDeque peekLast() Method in Java

Last Updated : 10 Dec, 2018

The java.util.ArrayDeque.peekLast() method in Java is used to retrieve or fetch the last element of the deque. The element retrieved does not get deleted or removed from the Queue instead the method just returns it. If no element is present in the deque or it is empty, then Null is returned. Syntax:

Array_Deque.peekLast()

Parameters: The method does not take any parameter. Return Value: The method returns the last element of the Deque. Below programs illustrate the Java.util.ArrayDeque.peekLast() method: Program 1:

Java

// Java code to illustrate peekLast() import java.util.*;  public class ArrayDequeDemo {     public static void main(String args[])     {         // Creating an empty ArrayDeque         Deque<String> de_que = new ArrayDeque<String>();          // Use add() method to add elements into the Deque         de_que.add("Welcome");         de_que.add("To");         de_que.add("Geeks");         de_que.add("4");         de_que.add("Geeks");          // Displaying the ArrayDeque         System.out.println("Initial ArrayDeque: " + de_que);          // Displaying the last element         System.out.println("The last element is: " +                                             de_que.peekLast());          // Displaying the ArrayDeque after operation         System.out.println("Final ArrayDeque: " + de_que);     } }

Output:

  Initial ArrayDeque: [Welcome, To, Geeks, 4, Geeks]  The last element is: Geeks  Final ArrayDeque: [Welcome, To, Geeks, 4, Geeks]

Program 2:

Java

// Java code to illustrate peekLast() import java.util.*;  public class ArrayDequeDemo {     public static void main(String args[])     {         // Creating an empty ArrayDeque         Deque<Integer> de_que = new ArrayDeque<Integer>();          // Use add() method to add elements into the Deque         de_que.add(10);         de_que.add(15);         de_que.add(30);         de_que.add(20);         de_que.add(5);          // Displaying the ArrayDeque         System.out.println("Initial ArrayDeque: " + de_que);          // Displaying the last element         System.out.println("The last element is: " +                                             de_que.peekLast());          // Displaying the ArrayDeque after operation         System.out.println("Final ArrayDeque: " + de_que);     } }

Output:

  Initial ArrayDeque: [10, 15, 30, 20, 5]  The last element is: 5  Final ArrayDeque: [10, 15, 30, 20, 5]

Program 3: For an empty deque:

Java

// Java code to illustrate peekLast() import java.util.*;  public class ArrayDequeDemo {     public static void main(String args[])     {         // Creating an empty ArrayDeque         ArrayDeque<Integer> de_que = new ArrayDeque<Integer>();          // Displaying the ArrayDeque         System.out.println("ArrayDeque: " + de_que);          // Displaying the last element         System.out.println("The last element is: " + de_que.peekLast());     } }

Output:

  ArrayDeque: []  The last element is: null

ArrayDeque peekLast() Method in Java

chinmoy lenka

Improve

Article Tags :

Practice Tags :

Similar Reads

ArrayDeque contains() Method in Java

The Java.util.ArrayDeque.contains() method in Java is used to check or verify whether a specific element is present in the Deque or not. Syntax: Array_Deque.contains(Object element) Parameters: The parameter element is of the type of ArrayDeque. This is the element that needs to be tested if it is p

2 min read

ArrayDeque iterator() Method in Java

The Java.util.ArrayDeque.iterator() method is used to return an iterator of the elements of the ArrayDeque. Syntax: Iterator iterate_value = Array_Deque.iterator(); Parameters: The method does not take any parameter. Return Value: The method iterates over the elements of the deque and returns the va

2 min read

ArrayDeque descendingIterator() Method in Java

The Java.util.ArrayDeque.descendingIterator() method is used to return an iterator of the same elements as the ArrayDeque but in the reverse order. Syntax: Iterator iterate_value = Array_Deque.descendingIterator(); Parameters: The method does not take any parameter. Return Value: The method iterates

2 min read

ArrayDeque element() Method in Java

The java.util.ArrayDeque.element() method in Java is used to retrieve or fetch the head of the ArrayDeque. In the process, the method does not delete the element from the deque instead it just returns the element. Syntax: Array_Deque.element() Parameters: The method does not take any parameter. Retu

2 min read

ArrayDeque getFirst() Method in Java

The java.util.ArrayDeque.getFirst() method in Java is used to retrieve or fetch the first element of the ArrayDeque. In the process, the method does not delete the element from the deque instead it just returns the first element of the deque. Syntax: Array_Deque.getFirst() Parameters: The method doe

2 min read

ArrayDeque getLast() Method in Java

The java.util.ArrayDeque.getLast() method in Java is used to retrieve or fetch the last element of the ArrayDeque. In the process, the method does not delete the element from the deque instead it just returns the last element of the deque.Syntax: Array_Deque.getLast() Parameters: The method does not

2 min read

ArrayDeque isEmpty() Method in Java

The Java.util.ArrayDeque.isEmpty() method in Java is used to check and verify if an ArrayDeque is empty or not. It returns True if the Deque is empty else it returns False. Syntax: Array_Deque.isEmpty() Parameters: The method does not take any parameter. Return Value: The function returns True if th

2 min read

ArrayDeque toArray() Method in Java

The java.util.ArrayDeque.toArray() method is used to form an array of the same elements as that of the Deque. Basically, the method copies all the element from this deque to a new array. Syntax: Object[] arr = Array_Deque.toArray() Parameters: The method does not take any parameters. Return Value: T

2 min read

ArrayDeque offer() Method in Java

The Java.util.ArrayDeque.offer(Object element) method in Java is used to add a specific element at the end of the Deque. The function is similar to the offerLast() method of ArrayDeque in Java. Syntax: Array_Deque.offer(Object element) Parameters: The parameter element is of the type ArrayDeque and

2 min read

ArrayDeque offerFirst() Method in Java

The Java.util.ArrayDeque.offerFirst(Object element) method in Java is used to add a specific element at the front of the Deque. The function is similar to the addFirst() method of ArrayDeque in Java. Syntax: Array_Deque.offerFirst(Object element) Parameters: The parameter element is of the type Arra

2 min read