The push() method is used to push an element onto the stack represented by a given deque.
This method is equivalent to addFirst(E).
Package: java.util
Java Platform: Java SE 8
Syntax:
push(E e)
Parameters:
Name Description e the element to pushReturn Value Type: E
Throws:
NullPointerException - if the specified element is null
Pictorial Presentation
Example: Java ArrayDeque Class: push() Method
import java.util.ArrayDeque;
import java.util.Deque;
public class Main {
public static void main(String[] args) {
// Create an array deque
Deque<Integer> deque = new ArrayDeque<Integer>(8);
// Use add() method to add elements in the deque
deque.add(100);
deque.add(200);
deque.add(150);
deque.add(95);
// Print all the elements of the original deque
System.out.println("Elements of the original deque:");
for (Integer number : deque) {
System.out.println("Number = " + number);
}
// Add two elements using push() method
deque.push(1000);
deque.push(1500);
// Print all the elements available in deque after pushing two elements using push()
System.out.println("New deque:");
for (Integer number : deque) {
System.out.println("Number = " + number);
}
}
}
Output:
Elements of the original deque: Number = 100 Number = 200 Number = 150 Number = 95 New deque: Number = 1500 Number = 1000 Number = 100 Number = 200 Number = 150 Number = 95
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