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 does not take any parameter.
Return Value: The method returns the first element present in the Deque.
Below programs illustrate the Java.util.ArrayDeque.getFirst() method:
Program 1:
// Java code to illustrate getFirst()import java.util.*; public class ArrayDequeDemo { public static void main(String args[]) { // Creating an empty ArrayDeque ArrayDeque<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("ArrayDeque: " + de_que); // Displaying the first element System.out.println("The first element is: " + de_que.getFirst()); }} |
Output:
ArrayDeque: [Welcome, To, Geeks, 4, Geeks] The first element is: Welcome
Program 2:
// Java code to illustrate getFirst()import java.util.*; public class ArrayDequeDemo { public static void main(String args[]) { // Creating an empty ArrayDeque ArrayDeque<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("ArrayDeque: " + de_que); // Displaying the first element System.out.println("The first element is: " + de_que.getFirst()); }} |
Output:
ArrayDeque: [10, 15, 30, 20, 5] The first element is: 10
