ArrayDeque push() Method in Java
Last Updated :
10 Dec, 2018
Improve
The Java.util.ArrayDeque.push(E element) method is used to push an element into the Deque. The operation is similar to the operation in the stack. The element gets pushed onto the top of the deque.
Syntax:
Java
Java
Array_Deque.push(E element)Parameters: The parameter element is of the type ArrayDeque and refers to the element to be pushed into the deque. Return Value: The method does not return any value. Exceptions: The method throws NullPointerException if the passed parameter is NULL. Below programs illustrate the Java.util.ArrayDeque.push() method: Program 1: Adding String elements into the Deque.
// Java code to illustrate push()
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 initial ArrayDeque
System.out.println("Initial Deque: " + de_que);
// Pushing elements into the deque
de_que.push("Hello");
de_que.push("World");
// Displaying the final ArrayDeque
System.out.println("Final Deque: " + de_que);
}
}
// Java code to illustrate push()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 initial ArrayDeque System.out.println("Initial Deque: " + de_que); // Pushing elements into the deque de_que.push("Hello"); de_que.push("World"); // Displaying the final ArrayDeque System.out.println("Final Deque: " + de_que); }}
Output:
Program 2: Adding Integer elements into the Deque.
Initial Deque: [Welcome, To, Geeks, 4, Geeks] Final Deque: [World, Hello, Welcome, To, Geeks, 4, Geeks]
// Java code to illustrate push()
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 initial ArrayDeque
System.out.println("Initial Deque: " + de_que);
// Pushing elements into the deque
de_que.push(1254);
de_que.push(4521);
// Displaying the final ArrayDeque
System.out.println("Final Deque: " + de_que);
}
}
// Java code to illustrate push()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 initial ArrayDeque System.out.println("Initial Deque: " + de_que); // Pushing elements into the deque de_que.push(1254); de_que.push(4521); // Displaying the final ArrayDeque System.out.println("Final Deque: " + de_que); }}
Output:
Initial Deque: [10, 15, 30, 20, 5] Final Deque: [4521, 1254, 10, 15, 30, 20, 5]
